F

Specifies force loads at nodes.

SOLUTION:FEForces

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Node at which force is to be specified. If ALL, NEND and NINC are ignored and forces are applied to all selected nodes [NSEL]. If P1 = P, graphical picking is enabled and all remaining command fields are ignored (valid only in the GUI). A component name may also be substituted for NODE.

Valid force label. Structural labels: FX, FY, or FZ (forces); MX, MY, or MZ (moments). Thermal labels: HEAT (heat flow). Fluid labels: FLOW (fluid flow). Electric labels: AMPS (current flow), CHRG (electric charge). Magnetic labels: FLUX (magnetic flux); CSGX, CSGY, or CSGZ (magnetic current segments). FLOTRAN labels: FX, FY, or FZ (forces).

Force value or table name reference for specifying tabular boundary conditions. To specify a table, enclose the table name in percent signs (%), e.g., F, NODE, HEAT,%tabname%). Use the *DIM command to define a table.

Second force value (if any). If the analysis type and the force allow a complex input, VALUE (above) is the real component and VALUE2 is the imaginary component.

Specifies the same values of force at the nodes ranging from NODE to NEND (defaults to NODE), in steps of NINC (defaults to 1).

The available force loads per node correspond to the degrees of freedom listed under "Degrees of Freedom" in the input table for each element type in the ANSYS Elements Reference. If both a force and a constrained degree of freedom [D] are specified at the same node, the constraint takes precedence. Forces are defined in the nodal coordinate system. The positive directions of structural forces and moments are along and about the positive nodal axis directions. The node and the degree of freedom label corresponding to the force must be selected [NSEL,DOFSEL].

You can specify a table name (VALUE=%tabname%) only for structural and thermal degrees of freedom (FX, FY, FZ, MX,MY, MZ, HEAT).

This command is also valid in PREP7.

Main Menu >Preprocessor >Loads >Apply >Excitation >On Nodes

Main Menu >Preprocessor >Loads >Apply >Flow >On Nodes

Main Menu >Preprocessor >Loads >Apply >Other >On Nodes

Main Menu >Preprocessor >Loads >Apply >Spectrum >On Nodes

Main Menu >Solution >Apply >Excitation >On Nodes

Main Menu >Solution >Apply >Flow >On Nodes

Main Menu >Solution >Apply >Other >On Nodes

Main Menu >Solution >Apply >Spectrum >On Nodes

Specifies the facet representation used to form solid model displays.

GRAPHICS:Style

	Mp Me St DY LP Th E3 E2 FL PP ED

Valid labels:

FINE - Use finer tessellation to increase the number of facets in the display. Provides the best representation (but decreases speed of operation).

NORML - Use the basic number of facets for the display (default).

WIRE - Display model with a wireframe representation (fast, but surfaces will not be shown).

Notes

Specifies the facet (or polygon) representation used to form solid model displays. Used only with the APLOT, ASUM, VPLOT, and VSUM commands.

This command is valid in any processor.

Utility Menu >PlotCtrls >Style >Solid Model Facets

Specifies "Fatigue data status" as the subsequent status topic.

PREP7:Status

	Mp Me St DY LP Th E3 E2 FL PP ED

This is a status [STAT] topic command. Status topic commands are generated by the GUI and will appear in the log file (Jobname.LOG) if status is requested for some items under Utility Menu>List>Status. This command will be immediately followed by a STAT command, which will report the status for the specified topic.

If entered directly into the program, the STAT command should immediately follow this command.

Utility Menu >List >Status >General Postproc >Fatigue Calcs

Specifies that force loads are to be accumulated.

SOLUTION:FEForces

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Accumulation key:

REPL - Subsequent values replace the previous values (default).

ADD - Subsequent values are added to the previous values.

IGNO - Subsequent values are ignored.

Scale factor for the real component. Zero (or blank) defaults to 1.0. Use a small number for a zero scale factor.

Scale factor for the imaginary component. Zero (or blank) defaults to 1.0. Use a small number for a zero scale factor.

Notes

Allows repeated force load (force, heat flow, etc.) values to be replaced, added, or ignored. Operations apply to the selected nodes [NSEL] and the force labels corresponding to the selected force labels [DOFSEL]. The operations occur when the next force specifications are defined. For example, issuing the command F,1,FX,250 after a previous F,1,FX,200 causes the current value of the force on node 1 in the x-direction to be 450 with the add operation, 250 with the replace operation, or 200 with the ignore operation. Scale factors are also available to multiply the next value before the add or replace operation. A scale factor of 2.0 with the previous "add" example results in a force of 700. Scale factors are applied even if no previous values exist. Issue FCUM,STAT to show the current label, operation, and scale factors. Solid model boundary conditions are not affected by this command, but boundary conditions on the FE model are affected. (Note that FE boundary conditions may still be overwritten by existing solid model boundary conditions if a subsequent boundary condition transfer occurs.)

This command is also valid in PREP7.

Main Menu >Preprocessor >Loads >Settings >Forces

Main Menu >Solution >Settings >Forces

Deletes a binary file after it is used.

SESSION:Files

	Mp Me St -- LP Th E3 E2 -- PP ED

ANSYS file name identifier. Valid identifiers are: EMAT, ESAV, FULL, SUB, MODE, TRI, DSUB, USUB, OSAV, and SELD. See the ANSYS Basic Analysis Procedures Guide for file descriptions.

Keep or delete key:

KEEP - Keep this file.

DELE - Delete (or do not write, if not necessary) this file.

Notes

Deletes as soon as possible (or prevents writing) a binary file created by the ANSYS program to save space. Warning: Deleting files that are necessary for the next substep, load step, or analysis will prevent continuation of the run.

This command is valid only at the Begin Level.

Utility Menu >File >ANSYS File Options

Deletes force loads on nodes.

SOLUTION:FEForces

	Mp Me St DY LP Th E3 E2 -- PP ED

Node for which force is to be deleted. If ALL, NEND and NINC are ignored and forces are deleted on all selected nodes [NSEL]. If NODE = P, graphical picking is enabled and all remaining command fields are ignored (valid only in the GUI). A component name may also be substituted for NODE.

Valid force label. If ALL, use all appropriate labels. Structural labels: FX, FY, or FZ (forces); MX, MY, or MZ (moments). Thermal labels: HEAT (heat flow). Fluid labels: FLOW (fluid flow). Electric labels: AMPS (current flow), CHRG (electric charge). Magnetic labels: FLUX (magnetic flux); CSGX, CSGY, or CSGZ (magnetic current segments). FLOTRAN labels: FX, FY, or FZ (forces).

Delete forces from NODE to NEND (defaults to NODE) in steps of NINC (defaults to 1).

The node and the degree of freedom label corresponding to the force must be selected [NSEL, DOFSEL].

This command is also valid in PREP7.

Main Menu >Preprocessor >Loads >Delete >Excitation >On Nodes

Main Menu >Preprocessor >Loads >Delete >Flow >On Nodes

Main Menu >Preprocessor >Loads >Delete >Force/Moment >On Nodes

Main Menu >Preprocessor >Loads >Delete >Heat Flow >On Nodes

Main Menu >Preprocessor >Loads >Delete >Other >On Nodes

Main Menu >Preprocessor >Loads >Delete >Spectrum >On Nodes

Main Menu >Preprocessor >Loads >Delete >All Load Data >On All Nodes

Main Menu >Solution >Delete >Excitation >On Nodes

Main Menu >Solution >Delete >Flow >On Nodes

Main Menu >Solution >Delete >Force/Moment >On Nodes

Main Menu >Solution >Delete >Heat Flow >On Nodes

Main Menu >Solution >Delete >Other >On Nodes

Main Menu >Solution >Delete >Spectrum >On Nodes

Main Menu >Solution >Delete >All Load Data >On All Nodes

Defines a set of fatigue event parameters.

POST1:Fatigue

	Mp Me St DY LP -- -- -- -- PP ED

Reference number for this event (within MXEV).

Number of required cycles (defaults to 1). If -1, erase all parameters and fatigue stresses for this event.

Scale factor to be applied to all loadings in this event (defaults to 1.0).

User defined identification title for this event (up to 20 characters).

Notes

Repeat FE command to define additional sets of event parameters (MXEV limit), to redefine event parameters, or to delete event stress conditions.

The set of fatigue event parameters is associated with all loadings and all locations. See the FTSIZE command for the maximum set of events (MXEV) allowed.

Main Menu >General Postproc >Fatigue >Assign Events

Main Menu >General Postproc >Fatigue >Erase Event Data

Specifies "Body loads on elements" as the subsequent status topic.

PREP7:Status

	Mp Me St DY LP Th E3 E2 FL PP ED

This is a status [STAT] topic command. Status topic commands are generated by the GUI and will appear in the log file (Jobname.LOG) if status is requested for some items under Utility Menu>List>Status. This command will be immediately followed by a STAT command, which will report the status for the specified topic.

If entered directly into the program, the STAT command should immediately follow this command.

Utility Menu >List >Status >Solution >Body Loads

Specifies "Constraints on nodes" as the subsequent status topic.

PREP7:Status

	Mp Me St DY LP Th E3 E2 FL PP ED

This is a status [STAT] topic command. Status topic commands are generated by the GUI and will appear in the log file (Jobname.LOG) if status is requested for some items under Utility Menu>List>Status. This command will be immediately followed by a STAT command, which will report the status for the specified topic.

If entered directly into the program, the STAT command should immediately follow this command.

Utility Menu >List >Status >Solution >DOF Constraints

Specifies "Forces on nodes" as the subsequent status topic.

PREP7:Status

	Mp Me St DY LP Th E3 E2 FL PP ED

This is a status [STAT] topic command. Status topic commands are generated by the GUI and will appear in the log file (Jobname.LOG) if status is requested for some items under Utility Menu>List>Status. This command will be immediately followed by a STAT command, which will report the status for the specified topic.

If entered directly into the program, the STAT command should immediately follow this command.

Utility Menu >List >Status >Solution >Forces

Lists the fatigue event parameters.

POST1:Fatigue

	Mp Me St DY LP -- -- -- -- PP ED

List event parameters from NEV1 (defaults to 1) to NEV2 (defaults to NEV1) in steps of NINC (defaults to 1). If NEV1 = ALL, NEV2 and NINC are ignored and all events are listed. Fatigue event parameters are defined with the FE command.

Main Menu >General Postproc >Fatigue >List Event Data

Specifies "Surface loads on elements" as the subsequent status topic.

PREP7:Status

	Mp Me St DY LP Th E3 E2 FL PP ED

This is a status [STAT] topic command. Status topic commands are generated by the GUI and will appear in the log file (Jobname.LOG) if status is requested for some items under Utility Menu>List>Status. This command will be immediately followed by a STAT command, which will report the status for the specified topic.

If entered directly into the program, the STAT command should immediately follow this command.

Utility Menu >List >Status >Solution >Surface Loads

Specifies the data file where results are to be found.

POST1:SetUp POST26:SetUp

	Mp Me St DY LP Th E3 E2 FL PP ED

Filename (32 characters maximum). Defaults to Jobname.

Filename extension (8 characters maximum). Defaults (if blank Fname) to RST (for structural, fluid, or coupled-field analyses), to RTH (for thermal or electrical analyses), to RMG (for magnetic analyses), to RFL (for FLOTRAN analyses). For processing reduced structural analyses in POST26, use extension RDSP for displacements from transient dynamic analyses or RFRQ from harmonic response analyses.

Directory name (64 characters maximum). Defaults to current directory.

Notes

Specifies the ANSYS data file where the results are to be found for postprocessing.

Main Menu >General Postproc >Data & File Opts

Main Menu >TimeHist Postpro >Settings >File

Specifies the binary file to be dumped.

AUX2:BinaryFiles

	Mp Me St DY LP Th E3 E2 FL PP ED

Filename (32 characters maximum) to be dumped. Defaults to the current Jobname if Ident is specified.

ANSYS filename identifier. See the ANSYS Basic Analysis Procedures Guide for file descriptions and identifiers. If not an ANSYS identifier, Ident will be used as the filename extension.

Directory name (64 characters maximum). Defaults to current directory.

Specifies the binary file to be dumped with the DUMP command.

Utility Menu >File >List >Binary Files

Utility Menu >List >Files >Binary Files

Specifies the file containing the graphics data.

DISPLAY:SetUp

	Mp Me St DY LP Th E3 E2 FL PP ED

Filename (8 characters maximum).

Filename extension (8 characters maximum).

Directory name (32 characters maximum). Defaults to current directory.

Specifies the input file containing the graphics data (defaults to File.GRPH).

DISPLAY Program

Generates a line of nodes between two existing nodes.

PREP7:Nodes

	Mp Me St DY LP Th E3 E2 FL PP ED

Beginning and ending nodes for fill-in. NODE1 defaults to next to last node specified, NODE2 defaults to last node specified. If P1 = P, graphical picking is enabled and all remaining command fields are ignored (valid only in the GUI).

Fill NFILL nodes between NODE1 and NODE2 (defaults to |NODE2-NODE1|-1). NFILL must be positive.

Node number assigned to first filled-in node (defaults to NODE1 + NINC).

Add this increment to each of the remaining filled-in node numbers (may be positive or negative). Defaults to the integer result of (NODE2-NODE1)/(NFILL + 1), i.e., linear interpolation. If the default evaluates to zero, or if zero is input, NINC is set to 1.

Do fill-in operation a total of ITIMEs, incrementing NODE1, NODE2 and NSTRT by INC each time after the first. ITIME and INC both default to 1.

Spacing ratio. Ratio of last division size to first division size. If > 1.0, divisions increase. If < 1.0, divisions decrease. Ratio defaults to 1.0 (uniform spacing).

Generates a line of nodes (in the active coordinate system) between two existing nodes. The two nodes may have been defined in any coordinate system. Nodal locations and rotation angles are determined by interpolation. Any number of nodes may be filled-in and any node number sequence may be assigned. See the CSCIR command when filling across the 180° singularity line in a non-Cartesian system.

Main Menu >Preprocessor >Create >Nodes >Fill between Nds

Fills a variable by a ramp function.

POST26:Operations

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Define data table as variable IR (2 to NV [NUMVAR]).

Start at location LSTRT (defaults to 1).

Stop at location LSTOP (defaults to maximum location as determined from data previously stored.

Fill every LINC location between LSTRT and LSTOP (defaults to 1).

Value assigned to location LSTRT.

Increment value of previous filled location by DVAL and assign sum to next location to be filled (may be positive or negative.)

Locations may be filled continuously or at regular intervals (LINC). Previously defined data at a location will be overwritten.

Main Menu >TimeHist Postpro >Table Operations >Fill Data

Changes the jobname for the analysis.

SESSION:RunControls

	Mp Me St DY LP Th E3 E2 FL PP ED

Name (32 characters maximum) to be used as the Jobname. Defaults to the initial Jobname as specified on the ANSYS execution command, or to "File" if none specified.

All subsequently created files will be named with this Jobname. Files opened before this command is issued will retain their previous name. The previous Jobname is typically defined on the ANSYS program execution line (see the ANSYS Operations Guide). Files opened before any command is read (such as File.LOG and File.ERR) cannot have their names changed with this command. This command is useful when different groups of files created throughout the run are to have different names. For example, the command may be used before each substructure pass to avoid overwriting files or having to rename each file individually.

This command is valid only at the Begin level.

Utility Menu >File >Change Jobname

Exits normally from a processor.

SESSION:ProcessorEntry DISPLAY:Action

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Exits any of the ANSYS processors or the DISPLAY program. For the ANSYS processors, data will remain intact in the database but the database is not automatically written to a file (use the SAVE command to write the database to a file). See also the /QUIT command for an alternate processor exit command. If exiting POST1, POST26, or OPT, see additional notes below.

POST1: Data in the database will remain intact, including the POST1 element table data, the path table data, the fatigue table data, and the load case pointers.

POST26: Data in the database will remain intact, except that POST26 variables are erased and specification commands (such as FILE, PRTIME, NPRINT, etc.) are reset. Use the /QUIT command to exit the processor and bypass these exceptions.

OPT: Current optimization data are written to File.OPT for possible resume later [OPRESU]. See also the OPSAVE command to write optimization data.

This command is valid in any processor. This command is not valid at the Begin level.

Main Menu >Finish

Identifies items chosen by a picking operation (GUI).

DATABASE:Picking

	Mp Me St DY LP Th E3 E2 FL PP ED

Field number on the command which uses the picking data. (Count the command name as a field, so that a 2 indicates the first command argument, 3 the second command argument, etc.) The corresponding field on the command will have a P51X label.

Entity number of the entity picked. Negative entity numbers are used to indicate a range of entities. If the item picked is a coordinate location, then this field represents the X-coordinate. See also the FLST command.

Y and Z coordinates of a picked coordinate location. ITEM represents the X coordinate. See also the FLST command.

This is a command generated by the GUI and will appear in the log file (Jobname.LOG) if graphical picking is used. This command is not intended to be typed in directly in an ANSYS session (although it can be included in an input file for batch input or for use with the /INPUT command).

On the log file, a set of FITEM commands is preceded by one FLST command which defines the picking specifications for that pick operation. The data listed in the FITEM commands are used by the first subsequent command containing a P51X label in one of its fields.

This command is valid in any processor.

This command cannot be accessed directly in the menu.

Defines force loads at keypoints.

SOLUTION:SolidForces

	Mp Me St -- LP Th E3 E2 -- PP ED

Keypoint at which force is to be specified. If ALL, apply to all selected keypoints [KSEL]. If KPOI = P, graphical picking is enabled and all remaining command fields are ignored (valid only in the GUI). A component name may also be substituted for KPOI.

Valid force label. Structural labels: FX, FY, or FZ (forces); MX, MY, or MZ (moments). Thermal labels: HEAT (heat flow). Fluid labels: FLOW (fluid flow). Electric labels: AMPS (current flow), CHRG (electric charge). Magnetic labels: FLUX (magnetic flux); CSGX, CSGY, or CSGZ (magnetic current segments).

Force value or table name reference for specifying tabular boundary conditions. To specify a table, enclose the table name in percent signs (%), e.g., FK, KPOI, HEAT,%tabname%). Use the *DIM command to define a table.

Second force value (if any). If the analysis type and the force allow a complex input, VALUE (above) is the real component and VALUE2 is the imaginary component.

Forces may be transferred from keypoints to nodes with the FTRAN or SBCTRAN commands. See the F command for a description of force loads.

You can specify a table name (VALUE=%tabname%) only for structural and thermal force labels (FX, FY, FZ, MX,MY, MZ, HEAT).

This command is also valid in PREP7.

Main Menu >Preprocessor >Loads >Apply >Excitation >On Keypoints

Main Menu >Preprocessor >Loads >Apply >Flow >On Keypoints

Main Menu >Preprocessor >Loads >Apply >Other >On Keypoints

Main Menu >Preprocessor >Loads >Apply >Spectrum >On Keypoints

Main Menu >Solution >Apply >Excitation >On Keypoints

Main Menu >Solution >Apply >Flow >On Keypoints

Main Menu >Solution >Apply >Other >On Keypoints

Main Menu >Solution >Apply >Spectrum >On Keypoints

Deletes force loads at a keypoint.

SOLUTION:SolidForces

	Mp Me St -- LP Th E3 E2 -- PP ED

Keypoint at which force is to be deleted. If ALL, delete forces at all selected keypoints [KSEL]. If KPOI = P, graphical picking is enabled and all remaining command fields are ignored (valid only in the GUI). A component name may also be substituted for KPOI.

Valid force label. If ALL, use all appropriate labels. See the FDELE command for labels.

Deletes force loads (and all corresponding finite element loads) at a keypoint. See the FDELE command for details.

This command is also valid in PREP7.

Main Menu >Preprocessor >Loads >Delete >Excitation >On Keypoints

Main Menu >Preprocessor >Loads >Delete >Flow >On Keypoints

Main Menu >Preprocessor >Loads >Delete >Force/Moment >On Keypoints

Main Menu >Preprocessor >Loads >Delete >Heat Flow >On Keypoints

Main Menu >Preprocessor >Loads >Delete >Other >On Keypoints

Main Menu >Preprocessor >Loads >Delete >Spectrum >On Keypoints

Main Menu >Preprocessor >Loads >Delete >All Load Data >On All KPs

Main Menu >Solution >Delete >Excitation >On Keypoints

Main Menu >Solution >Delete >Flow >On Keypoints

Main Menu >Solution >Delete >Force/Moment >On Keypoints

Main Menu >Solution >Delete >Heat Flow >On Keypoints

Main Menu >Solution >Delete >Other >On Keypoints

Main Menu >Solution >Delete >Spectrum >On Keypoints

Main Menu >Solution >Delete >All Load Data >On All KPs

Lists the forces at keypoints.

SOLUTION:SolidForces

	Mp Me St -- LP Th E3 E2 -- PP ED

List forces at this keypoint. If ALL (default), list for all selected keypoints [KSEL]. If KPOI = P, graphical picking is enabled and all remaining command fields are ignored (valid only in the GUI). A component name may also be substituted for KPOI.

Force label to be listed (defaults to ALL). See the DOFSEL command for labels.

Listing applies to the selected keypoints [KSEL] and the selected force labels [DOFSEL].

This command is valid in any processor.

Utility Menu >List >Loads >Forces >On All Keypoints

Utility Menu >List >Loads >Forces >On Picked KPs

Defines a set of fatigue location parameters.

POST1:Fatigue

	Mp Me St DY LP -- -- -- -- PP ED

Reference number for this location (within MXLOC). When defining a new location, defaults to lowest unused location. If the specified NODE is already associated with a location, NLOC defaults to that existing location.

Node number corresponding to this location (must be unique). Used only to associate a node with a new location or to find an existing location (if NLOC is not input). If NODE = -1 (or redefined), erase all parameters and fatigue stresses for this location.

Stress concentration factors applied to the total stresses. Factors are applied in the global X, Y, and Z directions unless the axisymmetric option of the FSSECT is used (i.e., RHO is nonzero), in which case the factors are applied in the section x, y, and z (radial, axial, and hoop) directions.

User-defined title for this location (up to 20 characters).

Repeat FL command to define additional sets of location parameters (MXLOC limit), to redefine location parameters, or to delete location stress conditions.

One location must be defined for each node of interest and only one node can be associated with each location. See the FTSIZE command for the maximum locations (MXLOC) allowed. A location will be automatically defined for a node not having a location when the FSSECT, FSNODE, or FS command is issued. Automatically defined locations are assigned the lowest available location number, unity stress concentration factors, and no title.

Main Menu >General Postproc >Fatigue >Stress Locations

Defines a flange in a piping run.

PREP7:Piping

	Mp Me St -- LP -- -- -- -- PP ED

Node where flange is to be placed (as described below). Defaults to current piping run starting point.

Length of flange (defaults to larger pipe OD).

Dry mass (weight/gravity) of flange without insulation (defaults to equivalent straight pipe mass). Note, acceleration [ACEL] must be nonzero for weight to be calculated.

Stress intensification factor (defaults to 1.0).

Bending flexibility factor (defaults to 1.0).

Insulation surface area (defaults to equivalent straight pipe insulation area). Units (length²) must be consistent with the smallest unit of the system used (not mixed) regardless of the PUNIT option.

Element number to be assigned to flange (defaults to MAXEL + 1).

Defines a flange (straight pipe element (PIPE16) with adjusted specifications and loadings) at a given location in a piping run. See the PREP7 RUN command. This command is similar to the VALVE command except for a different flexibility factor default. The location may be 1) between two adjacent colinear straight pipes, 2) between an adjacent straight pipe and a different piping component, or 3) at the end of a straight pipe.

For Case 1, two new nodes are generated at the ends of the flange. The two straight pipes are automatically "shortened" to meet the ends of the flange. The flange specifications and loadings are taken from the corresponding two straight pipes.

For Case 2, one new node is generated at one end of the flange. The straight pipe is automatically "shortened" to meet this end of the flange. The other end of the flange meets the other piping component. The flange specifications and loadings are taken from the straight pipe.

For Case 3, one new node is generated at the free end of the flange. The other end of the flange meets the straight pipe. The flange specifications and loadings are taken from the straight pipe.

Main Menu >Preprocessor >Create >Piping Models >Flange

Sets up a FLOTRAN analysis.

PREP7:FLOTRANOptions

	Mp -- -- -- -- -- -- -- FL PP ED

The name identifying the group of FLOTRAN parameters being defined or controlled on this command.

The label of the specific FLOTRAN parameter being input or controlled. Label determines the meaning of the Value argument.

The numeric value of an input item, the logical value of a switch (T or F, for example), or an alphanumeric label, depending on the Label argument.

The FLDATA command is used to define FLOTRAN-specific input data, solution controls, and output controls. It is valid only with the FLOTRAN CFD option.

The FLDATA command controls 33 groups of FLOTRAN parameters, and the group name is input as the first argument, Name.

To give you the ability to link directly to the documentation on any of these 33 groups, we have documented each group under its own name-from FLDATA1 through FLDATA32. For example, documentation on FLDATA with the first argument set to SOLU is documented as the FLDATA1 command. You may enter the command with either name-FLDATA or FLDATA1, and you must remember to input the appropriate first argument, as shown in the list below.

FLDATA1,SOLU - Controls which features of the solution algorithm are activated.

FLDATA2,ITER - Sets iteration and output controls for steady state analyses .

FLDATA3,TERM - Sets the convergence monitors for the pressure and temperature equations.

FLDATA4,TIME - Sets output controls for transient analyses based on transient time.

FLDATA4A,STEP - Sets output controls for transient analyses based on number of time steps.

FLDATA5,OUTP - Sets output and storage controls.

FLDATA6,CONV - Controls the output of the convergence monitor.

FLDATA7,PROT - Specifies the type of fluid property.

FLDATA8,NOMI - Specifies the NOMI coefficient of the fluid property equation.

FLDATA9,COF1 - Specifies the COF1 coefficient of the fluid property equation.

FLDATA10,COF2 - Specifies the COF2 coefficient of the fluid property equation.

FLDATA11,COF3 - Specifies the COF3 coefficient of the fluid property equation.

FLDATA12,PROP - Sets the property update frequency flag.

FLDATA13,VARY - Sets the property variation flag.

FLDATA14,TEMP - Specifies the reference temperature.

FLDATA15,PRES - Specifies the reference pressure.

FLDATA16,BULK - Specifies the bulk modulus parameter.

FLDATA17,GAMM - Specifies the specific heat ratio.

FLDATA18,METH - Selects the algebraic solver.

FLDATA19,TDMA - Specifies the number of TDMA sweeps.

FLDATA20,SRCH - Specifies the number of conjugate direction search vectors.

FLDATA20A,PGMR - Specifies the amount of fill-in when preconditioning the coefficient matrix.

FLDATA21,CONV - Specifies the solver convergence criterion.

FLDATA22,MAXI - Maximum number of semi-direct iterations.

FLDATA23,DELT - Specifies the solver minimum normalized rate of change.

FLDATA24,TURB - Sets the turbulence model and the constants used in the Standard k- Model and the Zero Equation Turbulence Model.

FLDATA24A,RNGT - lSets constants for the Re-Normalized Group Turbulence Model (RNG).

FLDATA24B,NKET - Sets constants for the New k-e Turbulence Model due to Shih (NKE).

FLDATA24C,GIRT - Sets constants for the Non-linear Turbulence Model of Girimaji (GIR).

FLDATA24D,SZLT - Sets constants for the Shih, Zhu, Lumley Turbulence Model (SZL).

FLDATA25,RELX - Sets solution and property relaxation factors.

FLDATA26,STAB - Sets stability controls.

FLDATA27,PRIN - Controls printing flags.

FLDATA28,MODR - Specifies that variable results are to be replaced.

FLDATA29,MODV - Re-initializes a results variable.

FLDATA30,QUAD - Controls the quadrature orders.

FLDATA31,CAPP - Specifies dependent variable caps.

FLDATA32,REST - Controls restart options.

FLDATA33,ADVM - Specifies the approach to discretize the advection term.

Main Menu >Preprocessor >FLOTRAN Set Up >Advection

Main Menu >Solution >FLOTRAN Set Up >Advection

Main Menu >Preprocessor >FLOTRAN Set Up >Execution Ctrl

Main Menu >Solution >FLOTRAN Set Up >Execution Ctrl

Controls which features of the solution algorithm are activated.

PREP7:FLOTRANOptions

	Mp Me St -- -- -- -- -- FL PP ED

Enter the word SOLU in this field.

FLDATA1,SOLU is the FLDATA command with its first argument set to SOLU. It can be entered into the program as either FLDATA1,SOLU,Label,Value or FLDATA,SOLU,Label,Value where Label and Value are as described below. See the FLDATA command for other FLOTRAN CFD input choices.

Solution algorithm choices:

FLOW - Solves the momentum and pressure equations. Defaults to TRUE (on).

TURB - Activates the turbulence model. Defaults to FALSE (off).

TEMP - Solves the temperature equation. Defaults to FALSE (off).

COMP - Uses the compressible algorithm. Defaults to FALSE (off).

SWRL - Activates the swirl option. Defaults to FALSE (off).

TRAN - Activates the transient solution algorithm. Defaults to FALSE (off).

SPEC - Activates multiple species transport. Defaults to FALSE (off).

Value controlling Label:

TRUE or T - Turn this feature on.

FALSE or F - Turn this feature off.

Repeat command to set each Label as required.

The analyst must choose the appropriate features, as FLOTRAN will not determine, for example, whether or not the case is turbulent or whether or not the compressible algorithm is appropriate.

SWRL should only be activated for axisymmetric cases when there is a velocity component normal to the axisymmetric plane.

Generally, the use of the compressible algorithm (COMP) is not warranted for Mach numbers less than 0.3. Density may be assumed to vary via the ideal gas law without activating the compressible option.

If fluid properties are not a function of temperature in non-adiabatic flow problems, it is not necessary to activate the flow (FLOW) and temperature (TEMP) solutions together. First solve the flow problem and then restart to solve the temperature equation.

See also the FLDATA2,ITER,FLDATA3,TERM,FLDATA4,TIME, FLDATA4A,STEP, FLDATA5,OUTP, and FLDATA6,CONV commands for other Solution and Output Controls.

Main Menu >Preprocessor >FLOTRAN Set Up >Solution Options

Main Menu >Solution >FLOTRAN Set Up >Solution Options

Sets iteration and output controls for steady state analyses.

PREP7:FLOTRANOptions

	Mp Me St -- -- -- -- -- FL PP ED

Enter the word ITER in this field.

FLDATA2,ITER is the FLDATA command with its first argument set to ITER. It can be entered into the program as either FLDATA2,ITER,Label,Value or FLDATA,ITER,Label,Value where Label and Value are as described below. See the FLDATA command for other FLOTRAN CFD input choices.

Type of iteration control (dictates the meaning of Value):

EXEC - Value is the number of global iterations, defined as the sequential solution of the governing equations of all the features activated, to be performed during this execution of FLOTRAN if the case is steady state. Defaults to Value=10.

APPE - Value is the number of steady state global iterations between appends to the results file (Jobname.RFL). This feature is used to ensure that restarts can be made from earlier points if unforeseen difficulties occur before the end of the analysis. The default value implies that results will be saved only for the initial (0^th) iteration and the final global iteration. Saving many intermediate results can produce a large results file. Defaults to Value=0 (implies FLDATA2,ITER,EXEC).

OVER - Value is the number of steady state global iterations between overwrites of a temporary set of results in the results file (Jobname.RFL). (This temporary set of results will itself be overwritten by the set stored for Label=APPE or at the end of the run.) OVER enables the user to retain the most up-to-date set of results without having the results file continue to grow in size. Defaults to Value=0 (no overwrites will be made).

Number of iterations for Label above.

Repeat command to set each Label as required.

Sets the number of global iterations to control the length of execution for steady state analyses, the frequency with which results are added to the results file (Jobname.RFL), and the frequency with which results are overwritten in the results file.

See also the FLDATA1,SOLU,FLDATA3,TERM,FLDATA4,TIME, FLDATA4A,STEP, FLDATA5,OUTP, and FLDATA6,CONV commands for other Solution and Output Controls.

This command is accessible in the menu if FLDATA1,SOLU,TRAN,FALSE has been issued (default).

Main Menu >Preprocessor >FLOTRAN Set Up >Execution Ctrl

Main Menu >Solution >FLOTRAN Set Up >Execution Ctrl

Sets the convergence monitors for the degree of freedom set.

PREP7:FLOTRANOptions

	Mp Me St -- -- -- -- -- FL PP ED

Enter the word TERM in this field.

FLDATA3,TERM is the FLDATA command with its first argument set to TERM. It can be entered into the program as either FLDATA3,TERM,Label,Value or FLDATA,TERM,Label,Value where Label and Value are as described below. See the FLDATA command for other FLOTRAN CFD input choices.

Type of convergence monitor:

PRES - Steady-state run will not terminate until the convergence monitor for pressure falls below Value, unless the specified number of global iterations has been executed. Defaults to Value=1.0x10^-8.

TEMP - Steady-state run (with the temperature equation solution activated) will not terminate until the convergence monitor for temperature falls below Value, unless the specified number of global iterations has been executed. Defaults to Value=1.0x10^-8.

VX - Steady-state run will not terminate until the convergence monitor for X velocity component falls below Value, unless the specified number of global iterations has been executed. Defaults to Value=1.0x10^-2.

VY - Steady-state run will not terminate until the convergence monitor for Y velocity component falls below Value, unless the specified number of global iterations has been executed. Defaults to Value=1.0x10^-2.

VZ - Steady-state run will not terminate until the convergence monitor for Z velocity component falls below Value, unless the specified number of global iterations has been executed. Defaults to Value=1.0x10^-2.

ENKE - Steady-state run will not terminate until the convergence monitor for turbulent kinetic energy falls below Value, unless the specified number of global iterations has been executed. Defaults to Value=1.0x10^-2.

ENDS - Steady-state run will not terminate until the convergence monitor for turbulence dissipation falls below Value, unless the specified number of global iterations has been executed. Defaults to Value=1.0x10^-2.

Value of convergence monitor criterion, above.

Repeat command to set each Label as required.

The convergence monitors appear as output for each degree of freedom for each global iteration. The value is calculated for each degree of freedom individually by summing the absolute value of the change in solution between global iterations for all the nodes and dividing it by the sum of the absolute values of the solution for all the nodes. It is an approximation of the normalized rate of change of the solution between global iterations.

All specified criteria must be met before the case is terminated.

If a termination criterion for a specific label is set negative, the termination check is ignored for that particular DOF.

See also the FLDATA1,SOLU, FLDATA2,ITER,FLDATA4,TIME, FLDATA4A,STEP, FLDATA5,OUTP, and FLDATA6,CONV commands for other Solution and Output Controls.

Main Menu >Preprocessor >FLOTRAN Set Up >Execution Ctrl

Main Menu >Solution >FLOTRAN Set Up >Execution Ctrl

Sets controls for transient analyses based on transient time and convergence monitors.

PREP7:FLOTRANOptions

	Mp Me St -- -- -- -- -- FL PP ED

Enter the word TIME in this field.

FLDATA4,TIME is the FLDATA command with its first argument set to TIME. It can be entered into the program as either FLDATA4,TIME,Label,Value or FLDATA,TIME,Label,Value where Label and Value are as described below. See the FLDATA command for other FLOTRAN CFD input choices.

Type of transient analysis control (dictates the meaning of Value):

STEP - Value controls the time step size. If Value is greater than zero, Value is the time step size. If Value is less than zero, the program chooses the time step, according to the following (Value defaults to -1):

-1 - The resulting time step will be small enough to prevent the passage of an arbitrarily small fluid parcel through more than one element length in a single time step.

-2 - This choice is only applicable for compressible analyses, and is equivalent to the Courant limit. The time step is small enough to prevent a pressure signal from propagating through more than one element during a single time step.

-3 - This choice is only applicable for compressible analyses. The smaller of the two time steps computed for options -1 and -2 is used.

-4 - This choice is applicable to "conduction only" cases (FLDATA1,SOLU,FLOW,F). The resulting time step prevents an arbitrarily small "parcel of heat" from diffusing or conducting through more than one element within a time step.

ISTEP - Value is the time step size for the first time step in an analysis using a FLOTRAN-calculated time step size (STEP=-1 through -4).

BC - Value is a flag indicating whether a transient boundary condition should be applied as a step change (when Value=0) or as a linear ramp (Value=1). This label is analogous to the ANSYS command KBC, except that the default for FLOTRAN is a step change.

NUMB - Value is the number of time steps which will be executed unless the transient end time has been encountered first.

GLOB - Value is the number of global iterations per time step. The user may elect to set this to a high value (typically between 30 and 50), and expect the time step to converge to the convergence criterion set by the FLDATA3,TERM command before completing Value iterations. Default to Value=10.

TEND - Value is the transient end time. This time is used for the calculation of ramped transient boundary conditions. The case will execute until this end time if the number of time steps specified is large enough. Defaults to Value=1.0x10⁺⁶.

APPE - Value is the results output frequency based on transient time. Every Value seconds in the transient, results are written to the Jobname.RFL file. Defaults to Value=1.0x10⁺⁶.

SUMF - Value is the output summary frequency based on transient time. Every Value seconds in the transient, a results summary is written to the Jobname.PFL file. Note that a summary will always be written when a set of results is written to the Jobname.RFL file. Defaults to Value=1.0x10⁺⁶.

OVER - Value is the time interval between overwrites of the temporary set of results in the results file (Jobname.RFL). This feature enables the user to retain the most up-to-date set of results without having the results file continue to grow in size. Defaults to Value=0 (no overwrites will be made).

PRES - If the maximum number of global iterations per time step has not been reached, the time step will terminate if the convergence monitor for pressure falls below Value. Defaults to Value=1.0x10^-6.

TEMP - If the maximum number of global iterations per time step has not been reached, the time step will terminate if the convergence monitor for temperature falls below Value. Defaults to Value=1.0x10^-6.

VX - If the maximum number of global iterations per time step has not been reached, the time step will terminate if the convergence monitor for X velocity component falls below Value. Defaults to Value=1.0x10^-2.

VY - If the maximum number of global iterations per time step has not been reached, the time step will terminate if the convergence monitor for Y velocity component falls below Value. Defaults to Value=1.0x10^-2.

VZ - If the maximum number of global iterations per time step has not been reached, the time step will terminate if the convergence monitor for Z velocity component falls below Value. Defaults to Value=1.0x10^-2.

ENKE - If the maximum number of global iterations per time step has not been reached, the time step will terminate if the convergence monitor for turbulent kinetic energy falls below Value. Defaults to Value=1.0x10^-2.

ENDS - If the maximum number of global iterations per time step has not been reached, the time step will terminate if the convergence monitor for turbulence dissipation falls below Value. Defaults to Value=1.0x10^-2.

Value as described for Label above.

Repeat command to set each Label as required.

All specified criteria must be met before the time step is terminated.

If a termination criterion for a specific label is set negative, the termination check is ignored for that particular DOF.

See the FLDATA4A,STEP command to specify output controls based on the number of time steps.

See also the FLDATA1,SOLU, FLDATA2,ITER,FLDATA3,TERM, FLDATA5,OUTP, and FLDATA6,CONV commands for other Solution and Output Controls.

This command is accessible in the menu if FLDATA1,SOLU,TRAN,TRUE has been issued.

For ramped loading (FLDATA4,TIME,BC,1), when a load is applied for the first time, it is interpolated from zero to the value of the current load step, and not from the initial condition or value of the DOF from the previous load step.

Main Menu >Preprocessor >FLOTRAN Set Up >Execution Ctrl

Main Menu >Solution >FLOTRAN Set Up >Execution Ctrl

Sets controls for transient analyses based on the number of time steps.

PREP7:FLOTRANOptions

	Mp Me St -- -- -- -- -- FL PP ED

Enter the word STEP in this field.

FLDATA4A,STEP is the FLDATA command with its first argument set to STEP. It can be entered into the program as either FLDATA4A,STEP,Label,Value or FLDATA,STEP,Label,Value where Label and Value are as described below. See the FLDATA command for other FLOTRAN CFD input choices.

Type of transient analysis control (dictates the meaning of Value):

APPE - Value is the results output frequency based on the number of time steps. Every Value time steps (substeps), results are written to the Jobname.RFL file. Defaults to Value=10.

SUMF - Value is the output summary frequency based on the number of time steps. Every Value time steps (substeps), a results summary is written to the Jobname.PFL file. Note that a results summary will be produced automatically when the results of a time step are written to the Jobname.RFL file. Defaults to Value=10.

OVER - Value is the number of time steps between overwrites of the temporary set of results in the results file (Jobname.RFL). This feature enables the user to retain the most up-to-date set of results without having the results file continue to grow in size. Defaults to Value=0 (no overwrites will be made).

Repeat command to set each Label as required.

See the FLDATA4,TIME command to specify output controls based on transient time.

See also the FLDATA1,SOLU;FLDATA2,ITER; FLDATA3,TERM; FLDATA5,OUTP; and FLDATA6,CONV commands for other solution and output controls.

This command is accessible in the menu if FLDATA1,SOLU,TRAN,TRUE has been issued.

Main Menu >Preprocessor >FLOTRAN Set Up >Execution Ctrl

Main Menu >Solution >FLOTRAN Set Up >Execution Ctrl

Sets output and storage controls.

PREP7:FLOTRANOptions

	Mp Me St -- -- -- -- -- FL PP ED

Enter the word OUTP in this field.

FLDATA5,OUTP is the FLDATA command with its first argument set to OUTP. It can be entered into the program as either FLDATA5,OUTP,Label,Value or FLDATA,OUTP,Label,Value where Label and Value are as described below. See the FLDATA command for other FLOTRAN CFD input choices.

Output and storage controls (dictates the meaning of Value):

SUMF - Value is the number of global iterations between output of results summaries. The results summary, output to the file Jobname.PFL, contains a tabulation of the maximum, minimum and average values of each degree of freedom. It also contains the flow rates, pressures, and temperatures at all the inlets and outlets. Defaults to Value=10.

DEBG - Value sets the debug file printout level. The debug file Jobname.DBG contains information on the behavior of the semi-direct solvers used in the solution of the equations. Allowable choices for Value are (defaults to 1):

0 - No information.

1 - Initial and final information for each global iteration.

2 - Complete information for each global iteration.

3 - Produces printout of global coefficient matrices (not recommended, since the files will become very large).

4 - Produces printout of matrices and additional values at every global iteration (not recommended, because files are usually very large).

RESI - Value is a flag controlling whether or not the nodal residual file Jobname.RDF is written. The nodal residual file contains the nodal residuals corresponding to the current solution (n-1st global iteration), and the new coefficient matrices and forcing function (nth global iteration). It indicates whether or not the solution is oscillating between global iterations on a nodal basis. The file produced is a text file (Jobname.RDF) that is read with the FLREAD command and that contains the residuals for the degrees of freedom (VX, VY, VZ, PRES, ENKE, ENDS and TEMP) for each node. Allowable values for Value are T (writes the file) or F (does not write the file). Defaults to Value=F.

DENS - Value controls the storage of the laminar density. This and the following labels are provided to control the size of the Jobname.RFL file (see notes below). The choices are Value=T (stores this component) or Value=F (does not store this component). Defaults to Value=T.

VISC - Value controls the storage of the laminar viscosity. Defaults to Value=T.

COND - Value controls the storage of the laminar conductivity. Defaults to Value=T.

EVIS - Value controls the storage of the effective viscosity. Defaults to Value=T.

ECON - Value controls the storage of the effective conductivity. Defaults to Value=T.

TTOT - Value controls the storage of the total temperature. Defaults to Value=T.

HFLU - Value controls the storage of the heat flux. Defaults to Value=T.

HFLM - Value controls the storage of the heat transfer (film) coefficient. Defaults to Value=T.

SPHT - Value controls the storage of the specific heat. Defaults to Value=F.

STRM - Value controls the storage of the stream function (2-D). Defaults to Value=T.

MACH - Value controls the storage of the Mach number. Defaults to Value=T.

PTOT - Value controls the storage of the total (stagnation) pressure. Defaults to Value=T.

PCOE - Value controls the storage of the pressure coefficient. Defaults to Value=T.

YPLU - Value controls the storage of the Y+ turbulence quantity. Defaults to Value=F.

TAUW - Value controls the storage of the shear stress at the wall. Defaults to Value=F.

LMDn - Laminar mass diffusion coefficient for species n, where n=1 to 6.

EMDm - Effective mass diffusion coefficient for species n, where n=1 to 6.

Value as described above.

Repeat command to set each Label as required.

SUMF, DEBG, and RESI control output to files other than the nodal results file (Jobname.RFL).

The remaining Label labels are provided in the event the user needs to control the size of the Jobname.RFL file. This may be the case when the results of many load steps or time steps are being stored for large models. The choices are T (stores this component) or F (does not store this component). Since the controls should only be set to F if the file size is a problem, most default values are T, and values of listed parameters are stored for every node.

FLOTRAN only allows non-storage of variables which it can calculate from some other means. If the value is not stored, it is replaced by calculations identical to those of the normal solution algorithm. The difference is that the new properties calculated in the absence of storage have not been relaxed as those in storage would have been. See FLDATA25,RELX for a description of relaxation.

Laminar properties such as density, viscosity, and thermal conductivity are either constant or a function of temperature. In the former case, the constant value can be obtained from the input. In the case of temperature dependent properties, the correct values are obtained from the temperature field (always stored if the temperature equation solution was activated [FLDATA1,SOLU,TEMP,TRUE]). The newly calculated value is stored as calculated at the initialization of the load step, whereas the value obtained from storage would have undergone relaxation.

If the effective viscosity and effective thermal conductivity are not stored, upon restart they will be calculated from the existing field of turbulent kinetic energy, turbulent kinetic energy dissipation rate, and the density. Again, this is similar to the usual calculation.

See also the FLDATA1,SOLU, FLDATA2,ITER, FLDATA3,TERM, FLDATA4,TIME, FLDATA4A,STEP, and FLDATA6,CONV commands for other Solution and Output Controls.

Main Menu >Preprocessor >FLOTRAN Set Up >Additional Out >Print Controls

Main Menu >Preprocessor >FLOTRAN Set Up >Additional Out >RFL Out Derived

Main Menu >Preprocessor >FLOTRAN Set Up >Additional Out >RFL Prop Based

Main Menu >Preprocessor >FLOTRAN Set Up >Additional Out >Residual File

Main Menu >Preprocessor >FLOTRAN Set Up >Execution Ctrl

Main Menu >Solution >FLOTRAN Set Up >Additional Out >Print Controls

Main Menu >Solution >FLOTRAN Set Up >Additional Out >RFL Out Derived

Main Menu >Solution >FLOTRAN Set Up >Additional Out >RFL Prop Based

Main Menu >Solution >FLOTRAN Set Up >Additional Out >Residual File

Main Menu >Solution >FLOTRAN Set Up >Execution Ctrl

Controls the output of the convergence monitor.

PREP7:FLOTRANOptions

	Mp Me St -- -- -- -- -- FL PP ED

Enter the word CONV in this field.

FLDATA6,CONV is the FLDATA command with its first argument set to CONV. It can be entered into the program as either FLDATA6,CONV,Label,Value or FLDATA,CONV,Label,Value where Label and Value are as described below. See the FLDATA command for other FLOTRAN CFD input choices.

Format and frequency controls (dictates the meaning of Value):

OUTP - Value controls which display format is used. Value can be LAND, BLOC, or BNOW, as described below (defaults to BNOW).

ITER - If OUTP Value is LAND or BLOC, Value is the number of iterations for which the convergence monitor information is stored in memory before being printed. Defaults to Value=1.

Value as described for Label above:

LAND - All DOF are output in landscape mode (valid only if Label=OUTP).

BLOC - All DOF are output in block mode (valid only if Label=OUTP).

BNOW - All DOF are presented in block format immediately as iterations are completed (valid only if Label=OUTP).

n - Number of iterations (valid only if Label=ITER).

The convergence monitor output will appear on the screen during an interactive FLOTRAN analysis as well as in the printed output. OUTP controls what display format is used, and ITER controls how many iterations are stored and displayed.

See also the FLDATA1,SOLU, FLDATA2,ITER, FLDATA3,TERM, FLDATA4,TIME, FLDATA4A,STEP, and FLDATA5,OUTP commands for other Solution and Output Controls.

The choices for OUTP are LANDscape mode, BLOCk mode, or the "block now" mode, BNOW. If OUTP is set to BNOW, convergence monitor information is not stored in the memory, but is presented immediately as it is calculated. If OUTP is set to either LAND or BLOC, information is first stored for n (ITER) iterations before being printed.

In the following illustrations, "x" denotes convergence monitor numbers greater than zero:

        Iter<  1      2      3      4      5      6
        VX     x      x      x      x      x      x
        VY     x      x      x      x      x      x
        VZ     x      x      x      x      x      x
        PRES   x      x      x      x      x      x
        ENKE   x      x      x      x      x      x
        ENDS   x      x      x      x      x      x
        TEMP   x      x      x      x      x      x

        Iter   VX     VY     VZ     PRES   ENKE   ENDS   TEMP
        ^
        1      x      x      x      x      x      x      X
        2      x      x      x      x      x      x      X
        3      x      x      x      x      x      x      X
        4      x      x      x      x      x      x      X
        5      x      x      x      x      x      x      X
        6      x      x      x      x      x      x      X

Main Menu >Preprocessor >FLOTRAN Set Up >Additional Out >Print Controls

Main Menu >Solution >FLOTRAN Set Up >Additional Out >Print Controls

Specifies the type of fluid property.

PREP7:FLOTRANProperty

	Mp Me St -- -- -- -- -- FL PP ED

Enter the word PROT in this field.

FLDATA7,PROT is the FLDATA command with its first argument set to PROT. It can be entered into the program as either FLDATA7,PROT,Label,Value or FLDATA,PROT,Label,Value where Label and Value are as described below. See the FLDATA command for other FLOTRAN CFD input choices.

Fluid property being typed:

DENS - Density (Value defaults to CONSTANT).

VISC - Viscosity (Value defaults to CONSTANT).

COND - Thermal conductivity (Value defaults to CONSTANT).

SPHT - Specific heat (Value defaults to CONSTANT).

Fluid property type:

CONSTANT - Constant properties. The FLDATA8,NOMI command must be used to specify nominal properties.

GAS - Gas properties. The FLDATA8,NOMI command must be used to specify nominal properties. FLDATA9,COF1, FLDATA10,COF2, and possibly FLDATA11,COF3, must also be used.

LIQUID - Liquid properties. The FLDATA8,NOMI command must be used to specify nominal properties. FLDATA9,COF1, FLDATA10,COF2, and possibly FLDATA11,COF3 must be used.

TABLE - Indicates that a table of property values and corresponding temperature values are input using the MPDATA and MPTEMP commands.

POWL - This choice for viscosity type activates the Power Law viscosity model, which is non-Newtonian. (For a description of the model see the ANSYS Theory Reference. The ANSYS CFD FLOTRAN Analysis Guide explains how to use the model.) The Power Law model requires you to specify four coefficients via the FLDATA8,NOMI,VISC command, the FLDATA9,COF1,VISC command, the FLDATA10,COF2,VISC command, and the FLDATA11,COF3,VISC command.

CARR - This choice for viscosity type activates the Carreau viscosity model, which in non-Newtonian. (For a description of this model, see the ANSYS Theory Reference. The ANSYS CFD FLOTRAN Analysis Guide explains how to use the non-Newtonian viscosity models.) The Carreau model requires you to specify four coefficients via the FLDATA8, NOMI,VISC command, the FLDATA9,COF1,VISC command, the FLDATA10,COF2,VISC command and the FLDATA11,COF3,VISC command.

BING - This choice for viscosity type activates the Bingham viscosity model, which is non-Newtonian. (For a description of this model, see the ANSYS Theory Reference. The ANSYS CFD FLOTRAN Analysis Guide explains how to use the non-Newtonian viscosity models.) The Bingham model requires you to specify three coefficients, using the FLDATA8,NOMI,VISC command, the FLDATA9,COF1,VISC command, and the FLDATA10,COF2,VISC command.

USRV - This choice for viscosity activates the user-programmable subroutine, USERVISLAW. In this routine, you can define your own constitutive relationship between viscosity and other variables such as position, time, temperature, pressure, velocity, velocity gradients, etc. For details, see the ANSYS Theory Reference, the ANSYS CFD FLOTRAN Analysis Guide, and the Guide to ANSYS User Programmable Features

The USERVISLAW subroutine uses the four coefficients you specify via the FLDATA8,NOMI,VISC command, the FLDATA9,COF1,VISC command, the FLDATA10,COF2,VISC command, and the FLDATA11,COF3,VISC command.

AIR - Air properties in units of meter-kg-sec.

AIR_B - Air properties in units of meter-kg-sec, and the pressure is set to the reference pressure for the evaluation of density.

AIR-SI - Air properties in units of meter-kg-sec.

AIR-SI_B - Air properties in units of meter-kg-sec, and the pressure is set to the reference pressure for the evaluation of density.

AIR-CM - Air properties in units of cm-g-sec.

AIR-CM_B - Air properties in units of cm-g-sec, and the pressure is set to the reference pressure for the evaluation of density.

AIR-MM - Air properties in units of mm-g-sec.

AIR-MM_B - Air properties in units of mm-g-sec, and the pressure is set to the reference pressure for the evaluation of density.

AIR-FT - Air properties in units of fl-slug-sec.

AIR-FT_B - Air properties in units of fl-slug-sec, and the pressure is set to the reference pressure for the evaluation of density.

AIR-IN - Air properties in units of in-(lbf-s**2/in)-sec (results in units of psi for pressure).

AIR-IN_B - Air properties in units of in-(lbf-s**2/in)-sec (results in units of psi for pressure), and the pressure is set to the reference pressure for the evaluation of density.

CMIX - The property is the mass fraction average of the individual species property. You can use this option only if the species are defined.

USER - Use one of the following user-programmable subroutines to define the property: UserDens to define density, UserVisLaw to define viscosity, UserSpht to define specific heat, or UserCond to define conductivity.

This command is used to specify the fluid property type (constant, gas, liquid, air) for the density, viscosity, and (if required) thermal conductivity and specific heat properties. Repeat the FLDATA7 command for each property as required.

The choice of fluid property type implies the use of one of the following equations. In all cases the program assumes that consistent units are being used. The value of unity for the gravitational constant g_c implies a consistent set of units.

If the property type is CONSTANT, then the equations used are as follows:

DENS = NOMI

VISC = NOMI

COND = NOMI

SPHT = NOMI

If the property type is LIQUID, then Sutherland's liquid law is used for the viscosity and conductivity and a second order polynomial as a function of temperature is used for density:

DENS = NOMI + COF2*(T - COF1) + COF3*(T-COF1)²

VISC = NOMI*EXP[(COF2*(1/T-1/COF1) + COF3*(1/T-1/COF1)²]

COND = NOMI*EXP[(COF2*(1/T-1/COF1) + COF3*(1/T-1/COF1)²]

If the type is GAS, Sutherland's law for gases is used for conductivity and viscosity and the ideal gas law is used for the density:

DENS = NOMI * (P/COF2) / (T/COF1)

VISC = NOMI * (T/COF1)^1.5 * (COF1 + COF2)/(T + COF2)

COND = NOMI * (T/COF1)^1.5 * (COF1 + COF2)/(T + COF2)

In each case, the value of NOMI is input with the FLDATA8,NOMI command, COF1 with FLDATA9,COF1, COF2 with FLDATA10,COF2, and COF3 with FLDATA11,COF3. No defaults are assumed.

For types other than GAS, LIQUID, CONSTANT, AIR or AIR_B, the values of constants in the evaluation of properties will be obtained from the file FLOPRP.ANS, where the data for AIR resides. See the ANSYS CFD FLOTRAN Analysis Guide for information on how to put data into the FLOPRP.ANS file.

See also the FLDATA8,NOMI, FLDATA9,COF1, FLDATA10,COF2, FLDATA11,COF3, FLDATA12,PROP, and FLDATA13,VARY commands for other Fluid Property Definition commands.

This command is accessed in the menu as FLDATA12,PROP.

Main Menu >Preprocessor >FLOTRAN Set Up >Fluid Properties

Main Menu >Solution >FLOTRAN Set Up >Fluid Properties

Specifies the NOMI coefficient of the fluid property equation.

PREP7:FLOTRANProperty

	Mp Me St -- -- -- -- -- FL PP ED

Enter the word NOMI in this field.

FLDATA8,NOMI is the FLDATA command with its first argument set to NOMI. It can be entered into the program as either FLDATA8,NOMI,Label,Value or FLDATA,NOMI,Label,Value where Label and Value are as described below. See the FLDATA command for other FLOTRAN CFD input choices.

Fluid property NOMI is being defined for:

DENS - Density.

VISC - Viscosity.

COND - Thermal conductivity.

SPHT - Specific heat.

Enter the value for NOMI.

Specifies the value NOMI as described on the FLDATA7,PROT command. NOMI is the constant fluid property value, or is the value of the property at the specified temperature COF1 (or simply the value of a coefficient). NOMI is only valid for property types GAS, LIQUID, and CONSTANT [FLDATA7,PROT]. If the property is a gas or liquid, FLDATA9,COF1, FLDATA10,COF2, and possibly FLDAT11,COF3, must also be used.

If the label is VISC, the FLDATA7,PROT command you enter determines what NOMI is. For example, if you issue the FLDATA7,PROT,VISC,POWL command, NOMI is the nominal viscosity for the Power Law model. If you issue the FLDATA7,PROT,VISC,BING command, the NOMI is the plastic viscosity for the Bingham model. If you issue the FLDATA7,PROT,VISC,CARR command, the NOMI is the zero shear rate viscosity for the Carreau model. If you issue the FLDATA7,PROT,USRV command, the NOMI is a coefficient available in USERVISLAW, the user-programmable subroutine for viscosity models.

See also the FLDATA12,PROP and FLDATA13,VARY commands for other Fluid Property Definition commands.

Main Menu >Preprocessor >FLOTRAN Set Up >Fluid Properties

Main Menu >Solution >FLOTRAN Set Up >Fluid Properties

Specifies the COF1 coefficient of the fluid property equation.

PREP7:FLOTRANProperty

	Mp Me St -- -- -- -- -- FL PP ED

Enter the word COF1 in this field.

FLDATA9,COF1 is the FLDATA command with its first argument set to COF1. It can be entered into the program as either FLDATA9,COF1,Label,Value or FLDATA,COF1,Label,Value where Label and Value are as described below. See the FLDATA command for other FLOTRAN CFD input choices.

Fluid property being described:

DENS - Density.

VISC - Viscosity.

COND - Thermal conductivity.

SPHT - Specific heat.

Absolute temperature at which the Label property has the value NOMI (defaults to 0.0) or simply a coefficient.

Specifies the value of absolute temperature associated with the property value set be FLDATA8,NOMI, as described on the FLDATA7,PROT command, or simply a coefficient. Setting the value of COF1 to zero results in a constant property for liquids or gas. If the property is a gas or liquid, FLDATA8,NOMI, FLDATA10,COF2, and possibly FLDATA11,COF3, must also be used.

If the label is VISC and you issue the FLDATA7,PROT,VISC,POWL command, the COF1 value is the cutoff shear rate for the Power Law Model. If you issue the FLDATA7,PROT,VISC,BING command, COF1 is the plastic stress value for the Bingham model. If you issue the FLDATA7,PROT,VISC,CARR command, the COF1 value is the infinite shear rate viscosity for the Carreau model. If you issue the FLDATA7,PROT,VISC,USRV command, COF1 is a coefficient available in the USERVISLAW subroutine.

If the label is SPHT, the COF1 value is available in the user-programmable subroutine UserSpht.

See also the FLDATA12,PROP, and FLDATA13,VARY commands for other Fluid Property Definition commands.

Main Menu >Preprocessor >FLOTRAN Set Up >Fluid Properties

Main Menu >Solution >FLOTRAN Set Up >Fluid Properties

Specifies the COF2 coefficient of the fluid property equation.

PREP7:FLOTRANProperty

	Mp Me St -- -- -- -- -- FL PP ED

Enter the word COF2 in this field.

FLDATA10,COF2 is the FLDATA command with its first argument set to COF2. It can be entered into the program as either FLDATA10,COF2,Label,Value or FLDATA,COF2,Label,Value where Label and Value are as described below. See the FLDATA command for other FLOTRAN CFD input choices.

Fluid property being described:

DENS - Density.

VISC - Viscosity.

COND - Thermal conductivity.

SPHT - Specific heat.

Coefficient COF2 (defaults to 0.0).

Specifies the value COF2 as described on the FLDATA7,PROT command.

If the label is VISC and you issue the FLDATA7,PROT,VISC,POWL command, the COF2 value is the consistency coefficient for the Power Law Model. If you issue the FLDATA7,PROT,VISC,BING command, COF2 is the Newtonian viscosity for the Bingham model. If you issue the FLDATA7,PROT,VISC,CARR command, the COF2 value is the time constant for the Carreau model. If you issue the FLDATA7,PROT,VISC,USRV command, COF2 is a coefficient available in the USERVISLAW subroutine.

For viscosity, liquid, gas,or thermal conductivity, COF2 is a Sutherland's law constant. For liquid density, it is a polynomial coefficient. For gas density, it is the pressure in the nominal ideal gas law constant evaluation. If the property is a gas or liquid, FLDATA8,NOMI, FLDATA9,COF1, and possibly FLDATA11,COF3, must also be used.

See also the FLDATA12,PROP, and FLDATA13,VARY commands for other Fluid Property Definition commands.

If the label is SPHT, the COF2 value is available in the user-programmable subroutine UserSpht.

Main Menu >Preprocessor >FLOTRAN Set Up >Fluid Properties

Main Menu >Solution >FLOTRAN Set Up >Fluid Properties

Specifies the COF3 coefficient of the fluid property equation.

PREP7:FLOTRANProperty

	Mp Me St -- -- -- -- -- FL PP ED

Enter the word COF3 in this field.

FLDATA11,COF3 is the FLDATA command with its first argument set to COF3. It can be entered into the program as either FLDATA11,COF3,Label,Value or FLDATA,COF3,Label,Value where Label and Value are as described below. See the FLDATA command for other FLOTRAN CFD input choices.

Fluid property being described:

DENS - Density.

VISC - Viscosity.

COND - Thermal conductivity.

SPHT - Specific heat.

Coefficient COF3 (defaults to 0.0).

Specifies the value COF3 as described on the FLDATA7,PROT command.

If the label is VISC and you issue the FLDATA7,PROT,VISC,POWL command, the COF3 value is the power for the Power Law Model. COF3 is not used in the Bingham model. If you issue the FLDATA7,PROT,VISC,CARR command, the COF3 value is the power for the Carreau model. If you issue the FLDATA7,PROT,VISC,USRV command, COF3 is a coefficient available in the USERVISLAW subroutine.

For the viscosity or thermal conductivity of a liquid, COF3 is a Sutherland's law constant. For the density of a liquid, it is a polynomial coefficient. It is not used for gases. FLDATA8,NOMI, FLDATA9,COF1, and FLDATA10,COF2, must also be used.

If the label is SPHT, the COF3 value is available in the user-programmable subroutine UserSpht.

See also the FLDATA12,PROP, and FLDATA13,VARY commands for other Fluid Property Definition commands.

Main Menu >Preprocessor >FLOTRAN Set Up >Fluid Properties

Main Menu >Solution >FLOTRAN Set Up >Fluid Properties

Sets the property update frequency flag.

PREP7:FLOTRANProperty

	Mp Me St -- -- -- -- -- FL PP ED

Enter the word PROP in this field.

FLDATA12,PROP is the FLDATA command with its first argument set to PROP. It can be entered into the program as either FLDATA12,PROP,Label,Value or FLDATA,PROP,Label,Value where Label and Value are as described below. See the FLDATA command for other FLOTRAN CFD input choices.

Updating label (dictates the meaning of Value):

IVIS - Value is the initial guess for viscosity. If you do not specify any value, the nominal viscosity issued via the FLDATA8,NOMI,VISC command is the initial viscosity. For information on using this label, see the ANSYS CFD FLOTRAN Analysis Guide.

UFRQ - Value is the number of global iterations (frequency of updating) between the update of the properties.

Number of iterations as described above (defaults to 1).

Properties will not be updated if the all the property types are set to CONSTANT with the FLDATA7 command.

See also the FLDATA7,PROT, FLDATA8,NOMI, FLDATA9,COF1, FLDATA10,COF2, FLDATA11,COF3, and FLDATA13,VARY commands for other Fluid Property Definition commands.

Main Menu >Preprocessor >FLOTRAN Set Up >Fluid Properties

Main Menu >Solution >FLOTRAN Set Up >Fluid Properties

Sets the property variation flag.

PREP7:FLOTRANProperty

	Mp Me St -- -- -- -- -- FL PP ED

Enter the word VARY in this field.

FLDATA13,VARY is the FLDATA command with its first argument set to VARY. It can be entered into the program as either FLDATA13,VARY,Label,Value or FLDATA,VARY,Label,Value where Label and Value are as described below. See the FLDATA command for other FLOTRAN CFD input choices.

Fluid property being described:

DENS - Density.

VISC - Viscosity.

COND - Thermal conductivity.

SPHT - Specific heat.

Flag value for property variation:

T - To turn property variation on.

F - To turn property variation off (default).

For non-constant fluid properties [FLDATA7,PROT], the appropriate flags must be set to T to allow property variation between global iterations.

See also the FLDATA7,PROT, FLDATA8,NOMI, FLDATA9,COF1, FLDATA10,COF2, FLDATA11,COF3, and FLDATA12,PROP commands for other Fluid Property Definition commands.

Main Menu >Preprocessor >FLOTRAN Set Up >Fluid Properties

Main Menu >Solution >FLOTRAN Set Up >Fluid Properties

Specifies the reference temperature.

PREP7:FLOTRANOperating

	Mp Me St -- -- -- -- -- FL PP ED

Enter the word TEMP in this field.

FLDATA14,TEMP is the FLDATA command with its first argument set to TEMP. It can be entered into the program as either FLDATA14,TEMP,Label,Value or FLDATA,TEMP,Label,Value where Label and Value are as described below. See the FLDATA command for other FLOTRAN CFD input choices.

Type of temperature specification (dictates the meaning of Value):

NOMI - Value is the initial temperature if a boundary condition or transient initial condition has not been set. Value defaults to 293.0.

BULK - Value is the temperature used to evaluate heat transfer coefficients given a heat flux or temperature at a boundary. Value defaults to 293.0.

TTOT - Value is the total (stagnation) temperature used in compressible adiabatic flow. The static temperature is calculated from the kinetic energy evaluated in terms of the velocity magnitude, specific heat, and gravitational constant:

Temperature as described above.

See also the FLDATA15,PRES, FLDATA16,BULK, and FLDATA17,GAMM commands for other Operating Condition commands.

Main Menu >Preprocessor >FLOTRAN Set Up >Flow Environment >Ref Conditions

Main Menu >Solution >FLOTRAN Set Up >Flow Environment >Ref Conditions

Specifies the reference pressure.

PREP7:FLOTRANOperating

	Mp Me St -- -- -- -- -- FL PP ED

Enter the word PRES in this field.

FLDATA14,PRES is the FLDATA command with its first argument set to PRES. It can be entered into the program as either FLDATA14,PRES,Label,Value or FLDATA,PRES,Label,Value where Label and Value are as described below. See the FLDATA command for other FLOTRAN CFD input choices.

Reference label (dictates the meaning of Value):

REFE - Value is the reference pressure. The absolute pressure results from adding the pressure components from rotating terms, the static pressure head, the FLOTRAN pressure, and the reference pressure. Value defaults to 1.0135x10⁺⁵.

Reference pressure as described above.

See also the FLDATA14,TEMP, FLDATA16,BULK, and FLDATA17,GAMM commands for other Operating Condition commands.

Main Menu >Preprocessor >FLOTRAN Set Up >Flow Environment >Ref Conditions

Main Menu >Solution >FLOTRAN Set Up >Flow Environment >Ref Conditions

Specifies the bulk modulus parameter.

PREP7:FLOTRANOperating

	Mp Me St -- -- -- -- -- FL PP ED

Enter the word BULK in this field.

FLDATA16,BULK is the FLDATA command with its first argument set to BULK. It can be entered into the program as either FLDATA16,BULK,Label,Value or FLDATA,BULK,Label,Value where Label and Value are as described below. See the FLDATA command for other FLOTRAN CFD input choices.

Label (dictates the meaning of Value):

BETA - Value is the bulk modulus parameter.

Value of bulk modulus parameter (defaults to 10¹⁵).

The bulk modulus parameter, _p, is used in the transient algorithm for incompressible flows:

The default value corresponds to that of a constant density fluid.

See also the FLDATA14,TEMP, FLDATA15,PRES, and FLDATA17,GAMM commands for other Operating Condition commands.

Main Menu >Preprocessor >FLOTRAN Set Up >Flow Environment >Ref Conditions

Main Menu >Solution >FLOTRAN Set Up >Flow Environment >Ref Conditions

Specifies the specific heat ratio.

PREP7:FLOTRANOperating

	Mp Me St -- -- -- -- -- FL PP ED

Enter the word GAMM in this field.

FLDATA17,GAMM is the FLDATA command with its first argument set to GAMM. It can be entered into the program as either FLDATA17,GAMM,Label,Value or FLDATA,GAMM,Label,Value where Label and Value are as described below. See the FLDATA command for other FLOTRAN CFD input choices.

Label (dictates the meaning of Value):

COMP - Value is the ratio of specific heats.

Value of the ratio (defaults to 1.4).

Specifies the ratio of specific heat at constant pressure to the specific heat at constant volume, Cp/Cv. It is used in compressible analyses.

See also the FLDATA14,TEMP, FLDATA15,PRES, and FLDATA16,BULK commands for other Operating Condition commands.

Main Menu >Preprocessor >FLOTRAN Set Up >Flow Environment >Ref Conditions

Main Menu >Solution >FLOTRAN Set Up >Flow Environment >Ref Conditions

Selects the algebraic solver.

PREP7:FLOTRANSolver

	Mp Me St -- -- -- -- -- FL PP ED

Enter the word METH in this field.

FLDATA18,METH is the FLDATA command with its first argument set to METH. It can be entered into the program as either FLDATA18,METH,Label,Value or FLDATA,METH,Label,Value where Label and Value are as described below. See the FLDATA command for other FLOTRAN CFD input choices.

Degree of freedom set for which solver is being specified:

PRES - Pressure equation.

TEMP - Energy equation.

VX - U velocity.

VY - V velocity.

VZ - W velocity.

ENKE - Turbulent kinetic energy.

ENDS - Turbulent kinetic energy dissipation rate.

Solver to be used for the degree of freedom set:

0 - Do not solve the equation set.

1 - Use the Tri-Diagonal Matrix Algorithm (default for all DOF sets except PRES). Also see the FLDATA19,TDMA command.

2 - Use the Conjugate Residual Method. See also the FLDATA20,SRCH, FLDATA21CONV, FLDATA22,MAXI, and FLDATA23,DELT commands.

3 - Use the Preconditioned Conjugate Residual Method (default for PRES DOF set). See also the FLDATA20,SRCH, FLDATA21CONV, FLDATA22,MAXI, and FLDATA23,DELT commands.

4 - Use the Preconditioned Generalized Minimum Residual solution method. See Chapter 5 of the ANSYS CFD FLOTRAN Analysis Guide for more information on conjugate heat transfer.

A solver can be specified for each degree of freedom set. Repeat the FLDATA18 command as needed.

The Tri-Diagonal Matrix Algorithm (TDMA) is a special case of the standard Gauss-Seidel iterative method for the solution of sets of algebraic equations. It is the preferred method for providing approximate solutions for the momentum and turbulence equations since exact solutions are not required. A convergence criterion is not specified for the TDMA method, merely the number of iterations (sweeps) to be performed [FLDATA19,TDMA].

The other three methods are semi-direct solution methods based on search directions. The Conjugate Residual method requires the least memory, but stalls when solving ill-conditioned problems. (In an ill-conditioned problem, the thermal properties of fluid and non-fluid materials are different by several orders of magnitude). The Preconditioned Conjugate Residual method requires much more memory but performs better for ill-conditioned matrix problems which can arise when you are solving conjugate heat transfer problems. The Preconditioned Generalized Minimum Residual method is memory-intensive; by necessity, it incorporates a tight convergence criterion. The PGMR method is recommended for solving the energy equation for ill-conditioned conjugate transfer problems.

For incompressible flow problems, the preconditioned conjugate gradient method is used for the solution of pressure if Value is greater than 1. The ANSYS Theory Reference contains more detail on these methods.

See also the FLDATA19,TDMA, FLDATA20,SRCH, FLDATA21,CONV, FLDATA22,MAXI, FLDATA23,DELT, commands for other Algebraic Solver controls.

Main Menu >Preprocessor >FLOTRAN Set Up >CFD Solver Controls >ENDS Solver CFD

Main Menu >Preprocessor >FLOTRAN Set Up >CFD Solver Controls >ENKE Solver CFD

Main Menu >Preprocessor >FLOTRAN Set Up >CFD Solver Controls >PRES Solver CFD

Main Menu >Preprocessor >FLOTRAN Set Up >CFD Solver Controls >TEMP Solver CFD

Main Menu >Preprocessor >FLOTRAN Set Up >CFD Solver Controls >VX Solver CFD

Main Menu >Preprocessor >FLOTRAN Set Up >CFD Solver Controls >VY Solver CFD

Main Menu >Preprocessor >FLOTRAN Set Up >CFD Solver Controls >VZ Solver CFD

Main Menu >Solution >FLOTRAN Set Up >CFD Solver Controls >ENDS Solver CFD

Main Menu >Solution >FLOTRAN Set Up >CFD Solver Controls >ENKE Solver CFD

Main Menu >Solution >FLOTRAN Set Up >CFD Solver Controls >PRES Solver CFD

Main Menu >Solution >FLOTRAN Set Up >CFD Solver Controls >TEMP Solver CFD

Main Menu >Solution >FLOTRAN Set Up >CFD Solver Controls >VX Solver CFD

Main Menu >Solution >FLOTRAN Set Up >CFD Solver Controls >VY Solver CFD

Main Menu >Solution >FLOTRAN Set Up >CFD Solver Controls >VZ Solver CFD

Specifies the number of TDMA sweeps.

PREP7:FLOTRANSolver

	Mp Me St -- -- -- -- -- FL PP ED

Enter the word TDMA in this field.

FLDATA19,TDMA is the FLDATA command with its first argument set to TDMA. It can be entered into the program as either FLDATA19,TDMA,Label,Value or FLDATA,TDMA,Label,Value where Label and Value are as described below. See the FLDATA command for other FLOTRAN CFD input choices.

Degree of freedom set for which the TDMA solver is being used:

PRES - Pressure equation (Value defaults to 100).

TEMP - Energy equation (Value defaults to 100).

VX - U velocity (Value defaults to 1).

VY - V velocity (Value defaults to 1).

VZ - W velocity (Value defaults to 1).

ENKE - Turbulent kinetic energy (Value defaults to 10).

ENDS - Turbulent kinetic energy dissipation rate (Value defaults to 10).

Number of iterations (sweeps) for this degree of freedom set.

Specifies the number of iterations (sweeps) the Tri-Diagonal Matrix Algorithm [FLDATA18,METH] will perform during the solution. A different number of sweeps may be specified for each degree of freedom set the TDMA solver is used for. Increasing the number for the velocity DOF may cause instability.

See also the FLDATA18,METH command for other Algebraic Solver controls.

This command is accessible in the menu if FLDATA18,METH,label,1 has been issued for the PRES, TEMP, ENKE, or ENDS labels.

Main Menu >Preprocessor >FLOTRAN Set Up >CFD Solver Controls >ENDS Solver CFD

Main Menu >Preprocessor >FLOTRAN Set Up >CFD Solver Controls >ENKE Solver CFD

Main Menu >Preprocessor >FLOTRAN Set Up >CFD Solver Controls >PRES Solver CFD

Main Menu >Preprocessor >FLOTRAN Set Up >CFD Solver Controls >TEMP Solver CFD

Main Menu >Solution >FLOTRAN Set Up >CFD Solver Controls >ENDS Solver CFD

Main Menu >Solution >FLOTRAN Set Up >CFD Solver Controls >ENKE Solver CFD

Main Menu >Solution >FLOTRAN Set Up >CFD Solver Controls >PRES Solver CFD

Main Menu >Solution >FLOTRAN Set Up >CFD Solver Controls >TEMP Solver CFD

Specifies the number of conjugate direction search vectors.

PREP7:FLOTRANSolver

	Mp Me St -- -- -- -- -- FL PP ED

Enter the word SRCH in this field.

FLDATA20,SRCH is the FLDATA command with its first argument set to SRCH. It can be entered into the program as either FLDATA20,SRCH,Label,Value or FLDATA,SRCH,Label,Value where Label and Value are as described below. See the FLDATA command for other FLOTRAN CFD input choices.

Degree of freedom set for which the solver is being used:

PRES - Pressure equation.

TEMP - Energy equation.

VX - U velocity.

VY - V velocity.

VZ - W velocity.

ENKE - Turbulent kinetic energy.

ENDS - Turbulent kinetic energy dissipation rate.

Number of search directions (defaults to 2). If you are using the PGMR solver, the default is to use 12 search vectors. Usage of fewer than 12 for PGMR is not permitted.

The conjugate direction iterative techniques (methods 2 and 3 on the FLDATA18,METH command) develop a solution as a linear combination of search directions. In the solution with methods 2 and 3, new search vectors are made orthogonal to Value previous vectors in the solution of the non-symmetric matrix systems. See the ANSYS CFD FLOTRAN Analysis Guide for details on when to change these values.

Note that the parameter is not applicable to the incompressible pressure equation since the new search vector is automatically orthogonal to all the previous ones.

See also the FLDATA18,METH,TDMA, FLDATA21,CONV, FLDATA22,MAXI, and FLDATA23,DELT commands for other Algebraic Solver controls.

This command is accessible in the menu if FLDATA18,METH,label,(2 or 3) has been issued for the relevant labels.

Main Menu >Preprocessor >FLOTRAN Set Up >CFD Solver Controls >ENDS Solver CFD

Main Menu >Preprocessor >FLOTRAN Set Up >CFD Solver Controls >ENKE Solver CFD

Main Menu >Preprocessor >FLOTRAN Set Up >CFD Solver Controls >PRES Solver CFD

Main Menu >Preprocessor >FLOTRAN Set Up >CFD Solver Controls >TEMP Solver CFD

Main Menu >Preprocessor >FLOTRAN Set Up >CFD Solver Controls >VX Solver CFD

Main Menu >Preprocessor >FLOTRAN Set Up >CFD Solver Controls >VY Solver CFD

Main Menu >Preprocessor >FLOTRAN Set Up >CFD Solver Controls >VZ Solver CFD

Main Menu >Solution >FLOTRAN Set Up >CFD Solver Controls >ENDS Solver CFD

Main Menu >Solution >FLOTRAN Set Up >CFD Solver Controls >ENKE Solver CFD

Main Menu >Solution >FLOTRAN Set Up >CFD Solver Controls >PRES Solver CFD

Main Menu >Solution >FLOTRAN Set Up >CFD Solver Controls >TEMP Solver CFD

Main Menu >Solution >FLOTRAN Set Up >CFD Solver Controls >VX Solver CFD

Main Menu >Solution >FLOTRAN Set Up >CFD Solver Controls >VY Solver CFD

Main Menu >Solution >FLOTRAN Set Up >CFD Solver Controls >VZ Solver CFD

Specifies the amount of fill-in when preconditioning the coefficient matrix.

PREP7:FLOTRANSolver

	Mp Me St -- -- -- -- -- FL PP ED

Enter the word PGMR in this field.

FLDATA20A,PGMR is the FLDATA command with its first argument set to PGMR. It can be entered into the program as either FLDATA20A,PGMR,Label,Value or FLDATA,PGMR,Label,Value where Label and Value are as described below. See the FLDATA command for other FLOTRAN CFD input choices.

Label (dictates the meaning of Value):

FILL - Value represents the number of extra elements allowed in each row of the L and U decomposition matrices. An extra element is defined as being in addition to the number of non-zero elements in the row of the original matrix. The allowable range for the fill parameter is 1 to 10 (defaults to 6).

MODP - Value represents the number of global iterations performed using the TDMA method between global iterations performed using the PGMR method for the temperature DOF. The first global iteration always uses the PGMR method. The global iteration count is based on the total number, not the number for a restart. Value defaults to 0 (PGMR always used).

Value as described above.

The fill parameter specifies the amount of fill-in when constructing the L and U decomposition of the coefficient matrix.

Use of FILL requires selection of the PGMR solver for the PRES or TEMP degree of freedom. Use of MODP requires selection of the PGMR solver for the temperature DOF.

Main Menu >Preprocessor >FLOTRAN Set Up >CFD Solver Controls >ENDS Solver CFD

Main Menu >Preprocessor >FLOTRAN Set Up >CFD Solver Controls >ENKE Solver CFD

Main Menu >Preprocessor >FLOTRAN Set Up >CFD Solver Controls >PRES Solver CFD

Main Menu >Preprocessor >FLOTRAN Set Up >CFD Solver Controls >TEMP Solver CFD

Main Menu >Preprocessor >FLOTRAN Set Up >CFD Solver Controls >VX Solver CFD

Main Menu >Preprocessor >FLOTRAN Set Up >CFD Solver Controls >VY Solver CFD

Main Menu >Preprocessor >FLOTRAN Set Up >CFD Solver Controls >VZ Solver CFD

Main Menu >Solution >FLOTRAN Set Up >CFD Solver Controls >ENDS Solver CFD

Main Menu >Solution >FLOTRAN Set Up >CFD Solver Controls >ENKE Solver CFD

Main Menu >Solution >FLOTRAN Set Up >CFD Solver Controls >PRES Solver CFD

Main Menu >Solution >FLOTRAN Set Up >CFD Solver Controls >TEMP Solver CFD

Main Menu >Solution >FLOTRAN Set Up >CFD Solver Controls >VX Solver CFD

Main Menu >Solution >FLOTRAN Set Up >CFD Solver Controls >VY Solver CFD

Main Menu >Solution >FLOTRAN Set Up >CFD Solver Controls >VZ Solver CFD

Specifies the convergence monitor.

PREP7:FLOTRANSolver

	Mp Me St -- -- -- -- -- FL PP ED

Enter the word CONV in this field.

FLDATA21,CONV is the FLDATA command with its first argument set to CONV. It can be entered into the program as either FLDATA21,CONV,Label,Value or FLDATA,CONV,Label,Value where Label and Value are as described below. See the FLDATA command for other FLOTRAN CFD input choices.

Degree of freedom set for which the solver is being used:

PRES - Pressure equation (Value defaults to 1.0x10^-7).

TEMP - Energy equation (Value defaults to 1.0x10^-7).

VX - U velocity (Value defaults to 1.0x10^-5).

VY - V velocity (Value defaults to 1.0x10^-5).

VZ - W velocity (Value defaults to 1.0x10^-5).

ENKE - Turbulent kinetic energy (Value defaults to 1.0x10^-5).

ENDS - Turbulent kinetic energy dissipation rate (Value defaults to 1.0x10^-5).

Convergence criterion factor.

The convergence monitor (for methods 2 or 3 on the FLDATA18,METH command) represents the factor by which the inner product of the residual vector is to be reduced during the solution of the equations at any global iteration.

If you are using the PGMR solver, the default convergence criterion is 1.E-10, and you should use no convergence criterion tighter than 1.E-14.

Less restrictive values are specified for the velocities and turbulence parameters because the iterative nature of the segregated solution algorithm in FLOTRAN does not require exact solutions to these equations at any global iteration. The default solution method for these degrees of freedom is the TDMA method.

See also the FLDATA18,METH, FLDATA20,SRCH, FLDATA22,MAXI, and FLDATA23,DELT commands for other Algebraic Solver controls.

This command is accessible in the menu if FLDATA18,METH,label,(2 or 3) has been issued for the relevant labels.

Main Menu >Preprocessor >FLOTRAN Set Up >CFD Solver Controls >ENDS Solver CFD

Main Menu >Preprocessor >FLOTRAN Set Up >CFD Solver Controls >ENKE Solver CFD

Main Menu >Preprocessor >FLOTRAN Set Up >CFD Solver Controls >PRES Solver CFD

Main Menu >Preprocessor >FLOTRAN Set Up >CFD Solver Controls >TEMP Solver CFD

Main Menu >Preprocessor >FLOTRAN Set Up >CFD Solver Controls >VX Solver CFD

Main Menu >Preprocessor >FLOTRAN Set Up >CFD Solver Controls >VY Solver CFD

Main Menu >Preprocessor >FLOTRAN Set Up >CFD Solver Controls >VZ Solver CFD

Main Menu >Solution >FLOTRAN Set Up >CFD Solver Controls >ENDS Solver CFD

Main Menu >Solution >FLOTRAN Set Up >CFD Solver Controls >ENKE Solver CFD

Main Menu >Solution >FLOTRAN Set Up >CFD Solver Controls >PRES Solver CFD

Main Menu >Solution >FLOTRAN Set Up >CFD Solver Controls >TEMP Solver CFD

Main Menu >Solution >FLOTRAN Set Up >CFD Solver Controls >VX Solver CFD

Main Menu >Solution >FLOTRAN Set Up >CFD Solver Controls >VY Solver CFD

Main Menu >Solution >FLOTRAN Set Up >CFD Solver Controls >VZ Solver CFD

Specifies the maximum number of semi-direct iterations.

PREP7:FLOTRANSolver

	Mp Me St -- -- -- -- -- FL PP ED

Enter the word MAXI in this field.

FLDATA22,MAXI is the FLDATA command with its first argument set to MAXI. It can be entered into the program as either FLDATA22,MAXI,Label,Value or FLDATA,MAXI,Label,Value where Label and Value are as described below. See the FLDATA command for other FLOTRAN CFD input choices.

Degree of freedom set for which the solver is being used:

PRES - Pressure equation (Value defaults to 500).

TEMP - Energy equation (Value defaults to 500).

VX - U velocity (Value defaults to 100).

VY - V velocity (Value defaults to 100).

VZ - W velocity (Value defaults to 100).

ENKE - Turbulent kinetic energy (Value defaults to 100).

ENDS - Turbulent kinetic energy dissipation (Value defaults to 100).

Limit on the number of iterations.

These limits apply to the semi-direct solution methods (method 2 or 3 on the FLDATA18,METH command). If this number of iterations is reached before the convergence criterion is met, the solution is accepted, a warning message is printed, and the program continues normally. However if the pressure equation is not solved to the precision desired three times during a load step, execution will terminate.

See also the FLDATA18,METH, FLDATA20,SRCH, FLDATA21,CONV, and FLDATA23,DELT commands for other Algebraic Solver controls.

This command is accessible in the menu if FLDATA18,METH,label,(2 or 3) has been issued for the relevant labels.

Main Menu >Preprocessor >FLOTRAN Set Up >CFD Solver Controls >ENDS Solver CFD

Main Menu >Preprocessor >FLOTRAN Set Up >CFD Solver Controls >ENKE Solver CFD

Main Menu >Preprocessor >FLOTRAN Set Up >CFD Solver Controls >PRES Solver CFD

Main Menu >Preprocessor >FLOTRAN Set Up >CFD Solver Controls >TEMP Solver CFD

Main Menu >Preprocessor >FLOTRAN Set Up >CFD Solver Controls >VX Solver CFD

Main Menu >Preprocessor >FLOTRAN Set Up >CFD Solver Controls >VY Solver CFD

Main Menu >Preprocessor >FLOTRAN Set Up >CFD Solver Controls >VZ Solver CFD

Main Menu >Solution >FLOTRAN Set Up >CFD Solver Controls >ENDS Solver CFD

Main Menu >Solution >FLOTRAN Set Up >CFD Solver Controls >ENKE Solver CFD

Main Menu >Solution >FLOTRAN Set Up >CFD Solver Controls >PRES Solver CFD

Main Menu >Solution >FLOTRAN Set Up >CFD Solver Controls >TEMP Solver CFD

Main Menu >Solution >FLOTRAN Set Up >CFD Solver Controls >VX Solver CFD

Main Menu >Solution >FLOTRAN Set Up >CFD Solver Controls >VY Solver CFD

Main Menu >Solution >FLOTRAN Set Up >CFD Solver Controls >VZ Solver CFD

Specifies the solver minimum normalized rate of change.

PREP7:FLOTRANSolver

	Mp Me St -- -- -- -- -- FL PP ED

Enter the word DELT in this field.

FLDATA23,DELT is the FLDATA command with its first argument set to DELT. It can be entered into the program as either FLDATA23,DELT,Label,Value or FLDATA,DELT,Label,Value where Label and Value are as described below. See the FLDATA command for other FLOTRAN CFD input choices.

Degree of freedom set for which the solver is being used:

PRES Pressure equation (Value defaults to 1.0x10^-10).

TEMP Energy equation (Value defaults to 1.0x10^-10).

VX - U velocity (Value defaults to 1.0x10^-10).

VY - V velocity (Value defaults to 1.0x10^-10).

VZ - W velocity (Value defaults to 1.0x10^-10).

ENKE - Turbulent kinetic energy (Value defaults to 1.0x10^-10).

ENDS - Turbulent kinetic energy dissipation (Value defaults to 1.0x10^-10).

Minimum normalized rate of change (delta).

Delta is the minimum normalized rate of change which will permit the semi-direct solution methods (method 2 or 3 on the FLDATA18,METH command) to continue.

Delta is used to terminate the semi-direct solvers in the event that stall occurs. If the methods stall, the solver increments the solution only a very small amount despite the fact that the correct solution has not been achieved. The maximum nodal difference between the solutions, normalized to the value of the variable, is compared to delta.

Termination of the algebraic solver due to the small rate of change is considered a normal function and no warning message is printed. Execution of FLOTRAN continues normally.

See also the FLDATA18,METH,FLDATA20,SRCH, FLDATA21,CONV, FLDATA22,MAXI commands for other Algebraic Solver controls.

This command is accessible in the menu if FLDATA18,METH,label,(2 or 3) has been issued for the relevant labels.

Main Menu >Preprocessor >FLOTRAN Set Up >CFD Solver Controls >ENDS Solver CFD

Main Menu >Preprocessor >FLOTRAN Set Up >CFD Solver Controls >ENKE Solver CFD

Main Menu >Preprocessor >FLOTRAN Set Up >CFD Solver Controls >PRES Solver CFD

Main Menu >Preprocessor >FLOTRAN Set Up >CFD Solver Controls >TEMP Solver CFD

Main Menu >Preprocessor >FLOTRAN Set Up >CFD Solver Controls >VX Solver CFD

Main Menu >Preprocessor >FLOTRAN Set Up >CFD Solver Controls >VY Solver CFD

Main Menu >Preprocessor >FLOTRAN Set Up >CFD Solver Controls >VZ Solver CFD

Main Menu >Solution >FLOTRAN Set Up >CFD Solver Controls >ENDS Solver CFD

Main Menu >Solution >FLOTRAN Set Up >CFD Solver Controls >ENKE Solver CFD

Main Menu >Solution >FLOTRAN Set Up >CFD Solver Controls >PRES Solver CFD

Main Menu >Solution >FLOTRAN Set Up >CFD Solver Controls >TEMP Solver CFD

Main Menu >Solution >FLOTRAN Set Up >CFD Solver Controls >VX Solver CFD

Main Menu >Solution >FLOTRAN Set Up >CFD Solver Controls >VY Solver CFD

Main Menu >Solution >FLOTRAN Set Up >CFD Solver Controls >VZ Solver CFD

Sets the turbulence model and the constants used in the Standard k- Model and the Zero Equation Turbulence Model.

PREP7:FLOTRANTurbulence

	Mp Me St -- -- -- -- -- FL PP ED

Enter the word TURB in this field.

FLDATA24,TURB is the FLDATA command with its first argument set to TURB. It can be entered into the program as either FLDATA24,TURB,Label,Value or FLDATA,TURB,Label,Value where Label and Value are as described below. See the FLDATA command for other FLOTRAN CFD input choices.

Turbulence model parameter label (dictates the meaning of Value):

MODL - Value sets the turbulence model used. Valid values are the integers 0 through 6 as follows:
0,1 - Standard k- Model (default).
2 - Zero Equation Turbulence Model.
3 - Re-Normalized Group Turbulence Model (RNG).
4 - New k- Model due to Shih (NKE).
5 - Non-linear Model of Girimaji (GIR).
6 - Shih, Zhu, Lumley Model (SZL).

RATI - Value is the turbulence ratio. The initial turbulent viscosity is equal to the laminar value times the turbulence ratio. Value defaults to 1000.

ININ - Value is the inlet intensity. The fluctuating velocity component at the inlet is assumed to be the magnitude of the inlet velocity times the inlet intensity. Value defaults to 0.01.

INSF - Value is the inlet scale factor. This factor is used to provide a length scale inlet region of the problem. The hydraulic diameter of the inlet is multiplied by the inlet scale factor. If a negative value is input, the absolute value is used as direct input of the hydraulic diameter. Value defaults to 0.01.

SCTK - Value is the Schmidt number for the turbulent kinetic energy. The diffusion term in the turbulent kinetic energy equation is divided by this factor. Value defaults to 1.0.

SCTD - Value is the Schmidt number for the kinetic energy dissipation rate. The diffusion term in the dissipation rate equation is divided by this factor. Value defaults to 1.3.

CMU - Value is the k- turbulence model constant

which is used in the update of the turbulent viscosity. Value defaults to 0.09.

C1 - Value is the k- turbulence model C1 constant. It is the multiplier of the shear rate generation term of the turbulent kinetic energy dissipation rate equation. Value defaults to 1.44.

C2 - Value is the k-e turbulence model C2 constant. It is the multiplier of the dissipation source term in the turbulent kinetic energy dissipation rate equation. Value defaults to 1.92.

BUC3 - Value is the k- buoyancy model constant. A value of zero means that there is no contribution to the turbulent kinetic energy dissipation rate equation. A value of zero is appropriate for stably thermally stratified flows. Value defaults to 1.0.

BUC4 - Value is the k- multiplier applied to the buoyancy term of the turbulent kinetic energy equation. A value of 1.0 is appropriate for the calculation of stably thermally stratified flows. Value defaults to 0.0.

BETA - Value is , the coefficient of thermal expansion

This term is used in the buoyancy terms of the k- model.

KAPP - Value is the law of the wall constant. It is the slope of the plot of normalized shear velocity (u⁺) versus the non-dimensionalized distance from the wall (y⁺). See ANSYS Theory Reference for details. Value defaults to 0.4.

EWLL - Value is the law of the wall constant. It is related to the y intercept value for a plot of normalized shear velocity (u⁺) versus the non-dimensionalized distance from the wall (y⁺). See the ANSYS Theory Reference for more details. Value defaults to 9.0.

WALL - Value is the choice of wall conductivity model. The default model is the Van Driest model (Value=VAND), used most often for high Prandtl number fluids. The second choice is the Spalding model (Value=SPAL), applicable to low Prandtl number fluids. The third choice is the Equilibrium model (Value=EQLB). The equilibrium model is also automatically invoked for the wall viscosity by this command.

VAND - Value is the constant in the Van Driest wall conductivity model. See the ANSYS Theory Reference for details. Value defaults to 26.0.

TRAN - Value is the magnitude of y⁺ marking the outer boundary of the laminar sublayer. Used only for the Equilibrium Wall model. Value defaults to 11.5.

ZELS - Value is the Zero Equation Model length scale (defaults to -1). A negative value means that FLOTRAN will calculate the value internally.

Turbulence model parameters values as explained above.

Sets the turbulence model and constants used in the Standard k- Model and the Zero Equation Turbulence Model. The other turbulence models are an extension of the Standard k- Model and different values are applied to some of the Standard k- Model constants and some additional constants are added.

Applicable only if the turbulence model is activated [FLDATA1,SOLU,TURB, TRUE]. The default values are used most often. See the ANSYS Theory Reference for more information on the turbulence models.

See also the FLDATA24A,RNGT, FLDATA24B,NKET, FLDATA24C,GIRT, and FLDATA24D,SZLT commands for other turbulence model constants.

Main Menu >Preprocessor >FLOTRAN Set Up >Turbulence >Buoyancy Terms

Main Menu >Preprocessor >FLOTRAN Set Up >Turbulence >Inlet Parameters

Main Menu >Preprocessor >FLOTRAN Set Up >Turbulence >Turbulence Model

Main Menu >Preprocessor >FLOTRAN Set Up >Turbulence >Wall Parameters

Main Menu >Solution >FLOTRAN Set Up >Turbulence >Buoyancy Terms

Main Menu >Solution >FLOTRAN Set Up >Turbulence >Inlet Parameters

Main Menu >Solution >FLOTRAN Set Up >Turbulence >Turbulence Model

Main Menu >Solution >FLOTRAN Set Up >Turbulence >Wall Parameters

Sets constants for the Re-Normalized Group Turbulence Model (RNG).

PREP7:FLOTRANTurbulence

	Mp Me St -- -- -- -- -- FL PP ED

Enter the word RNGT in this field.

FLDATA24A,RNGT is the FLDATA command with its first argument set to RNGT. It can be entered into the program as either FLDATA24A, RNGT, Label,Value or FLDATA,RNGT,Label,Value where Label and Value are as described below.

Turbulence model parameter label (dictates the meaning of Value):

SCTK - Value is the Schmidt number for the turbulent kinetic energy. The diffusion term in the turbulent kinetic energy equation is divided by this factor. Value defaults to 0.72.

SCTD - Value is the Schmidt number for the kinetic energy dissipation rate. The diffusion term in the dissipation rate equation is divided by this factor. Value defaults to 0.72.

CMU - Value is the turbulence model constant

which is used in the update of the turbulent viscosity. Value defaults to 0.085.

C1 - Value is the multiplier of the shear rate generation term of the turbulent kinetic energy dissipation rate equation. Value defaults to 1.42.

C2 - Value is the multiplier of the dissipation source term in the turbulent kinetic energy dissipation rate equation. Value defaults to 1.68.

BETA - Value is the RNG model constant,

Value defaults to 0.012, which corresponds to a value of 0.4 for the von Karman constant.

ETAI - Value is the asymptotic value of the strain rate parameter eta. Value defaults to 4.38.

Turbulence model parameters values as explained above.

The Re-Normalized Group Turbulence Model (RNG) is an extension of the Standard k-e Model. Different values are applied to five of the Standard k-e Model constants and two additional constants are added. The values for the RNG Model are applied with the FLDATA24A,RNGT command and are separate from the Standard k-e Model constants.

Applicable only if the Re-Normalized Group Turbulence Model (RNG) is activated [FLDATA24,TURB,MODL,3]. The default values are used most often. See the ANSYS Theory Reference for more information on the turbulence models.

See also the FLDATA24,TURB command.

Main Menu >Preprocessor >FLOTRAN Set Up >Turbulence >Turbulence Model

Main Menu >Solution >FLOTRAN Set Up >Turbulence >Turbulence Model

Sets constants for the New k-e Turbulence Model due to Shih (NKE).

PREP7:FLOTRANTurbulence

	Mp Me St -- -- -- -- -- FL PP ED

Enter the word NKET in this field.

FLDATA24B,NKET is the FLDATA command with its first argument set to NKET. It can be entered into the program as either FLDATA24B, NKET, Label,Value or FLDATA,NKET,Label,Value where Label and Value are as described below.

Turbulence model parameter label (dictates the meaning of Value):

SCTK - Value is the Schmidt number for the turbulent kinetic energy. The diffusion term in the turbulent kinetic energy equation is divided by this factor. It is the constant. Value defaults to 1.0.

SCTD - Value is the Schmidt number for the kinetic energy dissipation rate. The diffusion term in the dissipation rate equation is divided by this factor. It is the constant. Value defaults to 1.2.

C2 - Value is the multiplier of the dissipation source term in the turbulent kinetic energy dissipation rate equation. Value defaults to 1.90.

C1MX - Value is the maximum allowed value of the C1 constant in the turbulent kinetic energy dissipation rate equation. Value defaults to 0.43.

Turbulence model parameters values as explained above.

The New k-e Turbulence Model due to Shih (NKE) is an extension of the Standard k-e Model. Different values are applied to three of the Standard k-e Model constants and an additional constant is added. The values for the NKE Model are applied with the FLDATA24B,NKET command and are separate from the Standard k-e Model constants.

Applicable only if the New k-e Model due to Shih (NKE) is activated [FLDATA24,TURB,MODL,4]. The default values are used most often. See the ANSYS Theory Reference for more information on the turbulence models.

See also the FLDATA24,TURB command.

Main Menu >Preprocessor >FLOTRAN Set Up >Turbulence >Turbulence Model

Main Menu >Solution >FLOTRAN Set Up >Turbulence >Turbulence Model

Sets constants for the Non-linear Turbulence Model of Girimaji (GIR).

PREP7:FLOTRANTurbulence

	Mp Me St -- -- -- -- -- FL PP ED

Enter the word GIRT in this field.

FLDATA24C,GIRT is the FLDATA command with its first argument set to GIRT. It can be entered into the program as either FLDATA24C, GIRT, Label,Value or FLDATA,GIRT,Label,Value where Label and Value are as described below.

Turbulence model parameter label (dictates the meaning of Value):

SCTK - Value is the Schmidt number for the turbulent kinetic energy. The diffusion term in the turbulent kinetic energy equation is divided by this factor. Value defaults to 1.0.

SCTD - Value is the Schmidt number for the kinetic energy dissipation rate. The diffusion term in the dissipation rate equation is divided by this factor. Value defaults to 1.3.

G0 - Value is the constant. Value defaults to 3.6.

G1 - Value is the constant. Value defaults to 0.0.

G2 - Value is the constant. Value defaults to 0.8.

G3 - Value is the constant. Value defaults to 1.94.

G4 - Value is the constant. Value defaults to 1.16.

Turbulence model parameters values as explained above.

Sets constants for the Non-linear Turbulence Model of Girimaji (GIR), which is an extension of the Standard k-e Model. Different values are applied to two of the Standard k-e Model constants and five additional constants are added. The values for the GIR Model are applied with the FLDATA24C,GIRT command and are separate from the Standard k-e Model constants.

Applicable only if the Non-linear Model of Girimaji (GIR) is activated [FLDATA24,TURB,MODL,5]. The default values are used most often. See the ANSYS Theory Reference for more information on the turbulence models.

See also the FLDATA24,TURB command.

Main Menu >Preprocessor >FLOTRAN Set Up >Turbulence >Turbulence Model

Main Menu >Solution >FLOTRAN Set Up >Turbulence >Turbulence Model

Sets constants for the Shih, Zhu, Lumley Turbulence Model (SZL).

PREP7:FLOTRANTurbulence

	Mp Me St -- -- -- -- -- FL PP ED

Enter the word SZLT in this field.

FLDATA24D,SZLT is the FLDATA command with its first argument set to SZLT. It can be entered into the program as either FLDATA24D, SZLT, Label,Value or FLDATA,SZLT,Label,Value where Label and Value are as described below.

Turbulence model parameter label (dictates the meaning of Value):

SCTK - Value is the Schmidt number for the turbulent kinetic energy. The diffusion term in the turbulent kinetic energy equation is divided by this factor. Value defaults to 1.0.

SCTD - Value is the Schmidt number for the kinetic energy dissipation rate. The diffusion term in the dissipation rate equation is divided by this factor. Value defaults to 1.3.

SZL1 - Value is the numerator constant used in the calculation of . It is the A_szl1 constant. Value defaults to 0.666.

SZL2 - Value is the denominator constant used in the calculation of . It is the A_szl2 constant. Value defaults to 1.25.

SZL3 - Value is the strain rate multiplier. It is the A_szl3 constant. Value defaults to 0.90.

Turbulence model parameters values as explained above.

Sets constants for the Shih, Zhu, Lumley Turbulence Model (SZL), which is an extension of the Standard k-e Model. Different values are applied to two of the Standard k-e Model constants and three additional constants are added. The values for the SZL Model are applied with the FLDATA24D,SZLT command and are separate from the Standard k-e Model constants.

Applicable only if the Shih, Zhu, Lumley Model (SZL) is activated [FLDATA24,TURB,MODL,6]. The default values are used most often. See the ANSYS Theory Reference for more information on the turbulence models.

See also the FLDATA24,TURB command.

Main Menu >Preprocessor >FLOTRAN Set Up >Turbulence >Turbulence Model

Main Menu >Solution >FLOTRAN Set Up >Turbulence >Turbulence Model

Sets solution and property relaxation factors.

PREP7:FLOTRANStability

	Mp Me St -- -- -- -- -- FL PP ED

Enter the word RELX in this field.

FLDATA25,RELX is the FLDATA command with its first argument set to RELX. It can be entered into the program as either FLDATA25,RELX,Label,Value or FLDATA,RELX,Label,Value where Label and Value are as described below. See the FLDATA command for other FLOTRAN CFD input choices.

Solution and property relaxation factor labels:

VX - Value is the U Velocity relaxation factor.

VY - Value is the V Velocity relaxation factor.

VZ - Value is the W Velocity relaxation factor.

PRES - Value is the pressure relaxation factor.

TEMP - Value is the temperature relaxation factor.

ENKE - Value is the kinetic energy relaxation factor.

ENDS - Value is the dissipation rate relaxation factor.

EVIS - Value is the effective viscosity relaxation factor.

ECON - Value is the effective conductivity relaxation factor.

DENS - Value is the density update relaxation factor.

VISC - Value is the viscosity update relaxation factor.

COND - Value is the conductivity update relaxation factor.

SPHT - Value is the specific heat relaxation factor.

Value of relaxation parameter as explained above (defaults to 0.5). Defaults to 1.0 for SPHT.

For stability purposes the solution in FLOTRAN is under-relaxed between global iterations. When the solution of the equations for a given degree of freedom is completed, the actual set of values used is related to the calculated set and the previous values as follows (where RELX is the relaxation factor):

See also the FLDATA18,METH, FLDATA19,TDMA, FLDATA20,SRCH, FLDATA21,CONV, FLDATA22,MAXI, and FLDATA23,DELT commands for other Solver Stability controls.

Main Menu >Preprocessor >FLOTRAN Set Up >Relax/Stab/Cap >DOF Relaxation

Main Menu >Preprocessor >FLOTRAN Set Up >Relax/Stab/Cap >Prop Relaxation

Main Menu >Solution >FLOTRAN Set Up >Relax/Stab/Cap >DOF Relaxation

Main Menu >Solution >FLOTRAN Set Up >Relax/Stab/Cap >Prop Relaxation

Sets stability controls.

PREP7:FLOTRANStability

	Mp Me St -- -- -- -- -- FL PP ED

Enter the word STAB in this field.

FLDATA26,STAB is the FLDATA command with its first argument set to STAB. It can be entered into the program as either FLDATA26,STAB,Label,Value or FLDATA,STAB,Label,Value where Label and Value are as described below. See the FLDATA command for other FLOTRAN CFD input choices.

Control label (dictates the meaning of Value):

TURB - Turbulence inertial relaxation (Value defaults to 1.0x10¹⁵).

MOME - Momentum inertial relaxation (Value defaults to 1.0x10¹⁵).

PRES - Pressure inertial relaxation (Value defaults to 1.0x10¹⁵).

TEMP - Energy inertial relaxation (Value defaults to 1.0x10²⁰).

VISC - Artificial viscosity (Value defaults to 0.0).

Inertial relaxation factor.

These controls are used to make the sets of equations diagonally dominant through inertial relaxation. Making the matrix equations more diagonally dominant makes them easier to solve. More global iterations are required for convergence if inertial relaxation is used. See the ANSYS Theory Reference for details.

Artificial viscosity can be activated to enhance stability in difficult compressible problems as well as in some incompressible problems. The artificial viscosity is added to the main diagonal and the forcing function of the momentum equations. The equations become more diagonally dominant locally in regions with high velocity gradients.

In compressible analyses, the artificial viscosity should be gradually removed as convergence is achieved since a non-zero value will affect the final solution. This is not necessary for incompressible analyses as the divergence of velocity should be zero. In practice, values of artificial viscosity should not exceed 1000 times the effective viscosity.

See also the FLDATA18,METH, FLDATA19,TDMA, FLDATA20,SRCH, FLDATA21,CONV, FLDATA22,MAXI, FLDATA23,DELT, FLDATA24,TURB, and FLDATA25,RELX commands for other Solver Stability controls.

Main Menu >Preprocessor >FLOTRAN Set Up >Relax/Stab/Cap >Stability Parms

Main Menu >Solution >FLOTRAN Set Up >Relax/Stab/Cap >Stability Parms

Controls dependent variable printing.

PREP7:FLOTRANMiscellaneous

	Mp Me St -- -- -- -- -- FL PP ED

Enter the word PRIN in this field.

FLDATA27,PRIN is the FLDATA command with its first argument set to PRIN. It can be entered into the program as either FLDATA27,PRIN,Label,Value or FLDATA,PRIN,Label,Value where Label and Value are as described below. See the FLDATA command for other FLOTRAN CFD input choices.

Dependent variable tabulation is being specified for:

VX - U velocity.

VY - V velocity.

VZ - W velocity.

PRES - Pressure.

TEMP - Temperature.

ENKE - Kinetic energy.

ENDS - Turbulent kinetic energy dissipation rate.

DENS - Density.

VISC - Viscosity.

COND - Conductivity.

SPHT - Specific heat.

EVIS - Effective viscosity.

ECON - Effective conductivity.

Tabulation key:

T Turn tabulation on.

F Turn tabulation off (default).

When set to T, this control produces a tabulation of the values of the particular dependent variable at every node. It is set at the beginning of a load step. The printout can be large and is contained in the file Jobname.PFL.

To observe the values of a dependent variable at selected nodes during postprocessing, see the PRNSOL command.

This command cannot be accessed directly in the menu.

Specifies that variable results are to be replaced.

PREP7:FLOTRANMiscellaneous

	Mp Me St -- -- -- -- -- FL PP ED

Enter the word MODR in this field.

FLDATA28,MODR is the FLDATA command with its first argument set to MODR. It can be entered into the program as either FLDATA28,MODR,Label,Value or FLDATA,MODR,Label,Value where Label and Value are as described below. See the FLDATA command for other FLOTRAN CFD input choices.

Dependent variables to be replaced:

VX - U velocity.

VY - V velocity.

VZ - W velocity.

PRES - Pressure.

TEMP - Temperature.

ENKE - Kinetic energy.

ENDS - Turbulent kinetic energy dissipation rate.

DENS - Density.

VISC - Viscosity.

COND - Conductivity.

SPHT - Specific heat.

EVIS - Effective viscosity.

ECON - Effective conductivity.

TTOT - Total temperature.

Variable replace flag:

T - Allow this variable to be re-initialized.

F - Do not allow this variable to be re-initialized (default).

Results for any of the dependent variables available can be replaced with new values for the next load step. Only a single value may be specified for the entire solution domain. This is used for re-initialization of a variable such as temperature, which has diverged while other temperature independent calculations have been successful.

To re-initialize a variable, first use this command to set the replacement flag to T for the desired variable. Then use the FLDATA29,MODV command to put in the new variable value. Note that the flag(s) will be automatically reset to F after the new value has been inserted.

See also the FLDATA29,MODV command.

Main Menu >Preprocessor >FLOTRAN Set Up >Mod Res/Quad Ord >Modify Results

Main Menu >Solution >FLOTRAN Set Up >Mod Res/Quad Ord >Modify Results

Re-initializes a results variable.

PREP7:FLOTRANMiscellaneous

	Mp Me St -- -- -- -- -- FL PP ED

Enter the word MODV in this field.

FLDATA29,MODV is the FLDATA command with its first argument set to MODV. It can be entered into the program as either FLDATA29,MODV,Label,Value or FLDATA,MODV,Label,Value where Label and Value are as described below. See the FLDATA command for other FLOTRAN CFD input choices.

Dependent variables to be replaced:

VX - U velocity.

VY - V velocity.

VZ - W velocity.

SP0n - Mass fraction of species n, where n = 1 to 6 (FLOTRAN). If a species is given a user-defined name [MSSPEC], use that name instead of SP0n.

PRES - Pressure.

TEMP - Temperature.

ENKE - Kinetic energy.

ENDS - Turbulent kinetic energy dissipation rate.

DENS - Density.

VISC - Viscosity.

COND - Conductivity.

SPHT - Specific heat.

EVIS - Effective viscosity.

ECON - Effective conductivity.

TTOT - Total temperature.

LMDn - Laminar mass diffusion coefficient for species n, where n=1 to 6.

EMDm - Effective mass diffusion coefficient for species n, where n=1 to 6.

New value of variable (defaults to 0.0). Specifying FLDATA29,MODV,Label,Value modifies the entire field variable to a constant value.

Results for any of the dependent variables available can be replaced with new values for the next load step. Only a single value may be specified for the entire solution domain. This is used for re-initialization of a variable such as temperature, which has diverged while other temperature independent calculations have been successful. Boundary conditions are re-applied upon restart.

Quantities which are not allowed to vary (e.g., CONSTANT properties) should not be modified. Also, modifying results should not be attempted on the initial run.

Main Menu >Preprocessor >FLOTRAN Set Up >Mod Res/Quad Ord >Modify Results

Main Menu >Solution >FLOTRAN Set Up >Mod Res/Quad Ord >Modify Results

Controls the quadrature orders.

PREP7:FLOTRANMiscellaneous

	Mp Me St -- -- -- -- -- FL PP ED

Enter the word QUAD in this field.

FLDATA30,QUAD is the FLDATA command with its first argument set to QUAD. It can be entered into the program as either FLDATA30,QUAD,Label,Value or FLDATA,QUAD,Label,Value where Label and Value are as described below. See the FLDATA command for other FLOTRAN CFD input choices.

Element integral to change quadrature for:

MOMD - Momentum diffusion term (defaults to 0 integration points).

MOMS - Momentum source term (defaults to 0 integration points).

PRSD - Pressure diffusion term (defaults to 1 integration point).

PRSS - Pressure source term (defaults to 1 integration point).

THRD - Thermal diffusion term (defaults to 0 integration points).

THRS - Thermal source term (defaults to 0 integration points).

TRBD - Turbulent diffusion terms (defaults to 0 integration points).

TRBS - Turbulent source terms (defaults to 2 integration points).

Number of integration points.

Controls the number of integration points used in the evaluation of element integrals. They are set at the optimum values by default. Values of 0 and 1 correspond to 1 point quadrature, but 0 means an average value of the diffusion coefficient has been used in the integrals. Values are automatically set to 2 for axisymmetric and polar analyses. Using a value of 2 will improve the accuracy for analyses using distorted elements. Repeat the FLDATA30 command as required.

Main Menu >Preprocessor >FLOTRAN Set Up >Mod Res/Quad Ord >CFD Quad Orders

Main Menu >Solution >FLOTRAN Set Up >Mod Res/Quad Ord >CFD Quad Orders

Specifies dependent variable caps.

PREP7:FLOTRANMiscellaneous

	Mp Me St -- -- -- -- -- FL PP ED

Enter the word CAPP in this field.

FLDATA31,CAPP is the FLDATA command with its first argument set to CAPP. It can be entered into the program as either FLDATA31,CAPP,Label,Value or FLDATA,CAPP,Label,Value where Label and Value are as described below. See the FLDATA command for other FLOTRAN CFD input choices.

Capping parameters. The first three are used to set the flags, and the rest are used to specify the cap values after the flag is set to T:

VELO - Value is the velocity capping flag (Value defaults to F).

TEMP - Value is the temperature capping flag (Value defaults to F).

PRES - Value is the pressure capping flag (Value defaults to F).

UMIN - Value is the minimum value of U velocity allowed (Value defaults to -1.E20).

UMAX - Value is the maximum value of U velocity allowed (Value defaults to +1.E20).

VMIN - Value is the minimum value of V velocity allowed (Value defaults to -1.E20).

VMAX - Value is the maximum value of V velocity allowed (Value defaults to +1.E20).

WMIN - Value is the minimum value of W velocity allowed (Value defaults to -1.E20).

WMAX - Value is the maximum value of W velocity allowed (Value defaults to +1.E20).

TMIN - Value is the minimum value of temperature allowed (Value defaults to 0.0).

TMAX - Value is the maximum value of temperature allowed (Value defaults to +1.E20).

PMIN - Value is the minimum value of pressure allowed (Value defaults to -1.E20).

PMAX - Value is the maximum value of pressure allowed (Value defaults to +1.E20).

Capping flag (T or F) or capping parameter value.

These parameters are used to limit arbitrarily the values of the dependent variables. Capping helps prevent divergence in the early stages of analyses. Be careful when using caps to ensure that they have no impact on the final answers. You should remove capping as convergence is approached.

To use capping, you must first set the flag to T and then set the maximum and minimum caps.

The pressure value calculated by the solution of the pressure equation is capped, not the relaxed value. Therefore, if you introduce pressure capping upon restarting an analysis, pressure values may still be outside the caps.

Main Menu >Preprocessor >FLOTRAN Set Up >Relax/Stab/Cap >Results Capping

Main Menu >Solution >FLOTRAN Set Up >Relax/Stab/Cap >Results Capping

Controls restart options.

PREP7:FLOTRANMiscellaneous

	Mp Me St -- -- -- -- -- FL PP ED

Enter the word REST in this field.

FLDATA32,REST is the FLDATA command with its first argument set to REST. It can be entered into the program as either FLDATA32,REST,Label,Value,Value2 or FLDATA,REST,Label,Value,Value2 where Label, Value, and Value2 are as described below. See the FLDATA command for other FLOTRAN CFD input choices.

Restart option (dictates the meaning of Value and Value2):

NSET - Identifies the restart point by results set number. Value is the results set number in the results file (Jobname.RFL) from which the analysis will be restarted. Value=0 or blank indicates that the restart will be from the last results set. Value will be reset to zero if the label ITER, LSTP, or TIME is subsequently set. Value2 is not used.

ITER - Identifies the restart point by cumulative iteration number. Value is the cumulative iteration number in the results file (Jobname.RFL) from which the analysis will be restarted. If there are no results stored for this cumulative iteration, the results set with the next lowest cumulative iteration number will be used. Value=0 or blank indicates that the restart will be from the last results set. Value will be reset to zero if the label NSET, LSTP, or TIME is subsequently set. Value2 is not used.

LSTP - Identifies the restart point by load step and substep numbers. Value and Value2 are the load step number and substep number in the results file (Jobname.RFL) from which the analysis will be restarted. Value=0 or blank indicates that the restart will be from the last results set. Value and Value2 will be reset to zero if the label ITER, NSET, or TIME is subsequently set.

TIME - Identifies the restart point by transient time. Value is the time point in the results file (Jobname.RFL) from which the analysis will be restarted. If there are no results stored for this time point, the results set with the next lowest time point will be used. Value=0 or blank indicates that the restart will be from the last results set. Value will be reset to zero if the label NSET, LSTP, or ITER is subsequently set. Value2 is not used.

RFIL - Specifies whether the CFD data structure restart file (Jobname.CFD) is to be read for the restart. Useful for large models where the creation of the data structures may take a long time. Value may be T (true) or F (false) and defaults to F. If the .CFD file does not exist, it will be created (if RFIL is set to true). Setting RFIL to true will toggle WFIL to false, and setting WFIL to true will toggle RFIL to false.

WFIL - Specifies whether the CFD data structure restart file (Jobname.CFD) is to be written. Useful for overwriting an existing restart file when changes in the model or boundary conditions have occurred. Value may be T (true) or F (false) and defaults to F. Setting WFIL to true will toggle RFIL to false, and setting RFIL to true will toggle WFIL to false.

OVER - Specifies whether to overwrite the set of results from which the restart occurs. Value may be -1, 0, or 1 (defaults to 0).
If Value is -1, the previous set of results are overwritten. If Value is 1, the previous set of results is saved. If Value is 0 (default), the previous results are saved only if the results were written as a saved (converged) set of results. When this flag is used to change the status of the previous set of results, ANSYS sets it to 0 so that future sets of results are not affected.

CLEAR - Specifies whether to eliminate from the results file (Jobname.RFL) all results sets stored before and after the set used for the restart. Value may be T (true) or F (false) and defaults to F. The restart set is the last set or the set specified with another FLADATA32,REST command. Use a positive value of NSET, ITER, LSTP, or TIME to create a backup of the results file and use a negative value of NSET, ITER, LSTP or TIME if you do not desire a backup of the results file (see Notes below).

Restart point or restart file flag (T or F) as described above.

If both RFIL and WFIL are set to true through the GUI, the state of WFIL will prevail and a new Jobname.CFD file will be written.

If the value of NSET, ITER, LSTP, or TIME is positive, the original results file (Jobname.RFL) is moved to Jobname.RFO, and a new Jobname.RFL is created containing all the results sets stored prior to the restart point as well as new results. If the value is negative, the Jobname.RFL file will contain the prior results and the new results but the old file will be destroyed. This latter option is used if the results sets currently stored beyond the desired restart point are not worth saving.

Main Menu >Preprocessor >FLOTRAN Set Up >Restart Options >CFD Restart File

Main Menu >Preprocessor >FLOTRAN Set Up >Restart Options >Restart/Clear

Main Menu >Preprocessor >FLOTRAN Set Up >Restart Options >Restart/Iteration

Main Menu >Preprocessor >FLOTRAN Set Up >Restart Options >Restart/Load step

Main Menu >Preprocessor >FLOTRAN Set Up >Restart Options >Restart/Set

Main Menu >Preprocessor >FLOTRAN Set Up >Restart Options >Restart/Time

Main Menu >Preprocessor >FLOTRAN Set Up >Restart Options >Tag set status

Main Menu >Solution >FLOTRAN Set Up >Restart Options >CFD Restart File

Main Menu >Solution >FLOTRAN Set Up >Restart Options >Restart/Clear

Main Menu >Solution >FLOTRAN Set Up >Restart Options >Restart/Iteration

Main Menu >Solution >FLOTRAN Set Up >Restart Options >Restart/Load step

Main Menu >Solution >FLOTRAN Set Up >Restart Options >Restart/Set

Main Menu >Solution >FLOTRAN Set Up >Restart Options >Restart/Time

Main Menu >Solution >FLOTRAN Set Up >Restart Options >Tag set status

Specifies the approach to discretize the advection term.

PREP7:FLOTRANMiscellaneous

	Mp -- -- -- -- -- -- -- FL PP ED

Enter the word ADVM in this field.

FLDATA33,ADVM is the FLDATA command with its first argument set to ADVM. It can be entered into the program as either FLDATA33,ADVM,Label,Value or FLDATA,ADVM,Label,Value where Label and Value are as described below. See the FLDATA command for other FLOTRAN CFD input choices.

Specifies the transport equation.

MOME - Momentum equations.

TURB - Turbulence equations.

PRES - Compressible pressure equation.

TEMP - Energy equation.

Choice of approach to discretize the advection term:

MSU - Monotone Streamline Upwind approach (default).

SUPG - Streamline Upwind / Petrov-Galerkin approach.

See the ANSYS Theory Reference for more information on the advection term.

Main Menu >Preprocessor >FLOTRAN Set Up >Advection

Main Menu >Solution >FLOTRAN Set Up >Advection

Lists force loads on the nodes.

SOLUTION:FEForces

	Mp Me St -- LP Th E3 E2 -- PP ED

List forces for nodes NODE1 to NODE2 (defaults to NODE1) in steps of NINC (defaults to 1). If ALL, list for all selected nodes [NSEL] and NODE2 and NINC are ignored (default). If NODE1 = P, graphical picking is enabled and all remaining command fields are ignored (valid only in the GUI). A component name may also be substituted for NODE1.

Listing applies to the selected nodes [NSEL] and the selected force labels [DOFSEL].

This command is valid in any processor.

Utility Menu >List >Loads >Forces >On All Nodes

Utility Menu >List >Loads >Forces >On Picked Nodes

Lists the fatigue location parameters.

POST1:Fatigue

	Mp Me St DY LP -- -- -- -- PP ED

List location parameters from NLOC1 (defaults to 1) to NLOC2 (defaults to NLOC1) in steps of NINC (defaults to 1). If NLOC1 = ALL, NLOC2 and NINC are ignored and all locations are listed.

Main Menu >General Postproc >Fatigue >List Stress Loc

Sets up and runs a zero-iteration FLOTRAN analysis.

SOLUTION:FLOTRANCheckout

	Mp -- -- -- -- -- -- -- FL PP ED

Determines whether the FLOTRAN analysis is initialized.

0 - (Default) Initialization is not performed.

1 - Initialization is performed

The FLOCHECK command will provide a results summary for the Zeroth iteration (KEY=1) or the current iteration (KEY=0). The results summary provides max/min/average values for each property and DOF. Also, mass flow boundaries are identified and all thermal energy transfer information is summarized. All input information is summarized in the Jobname.PFL file (i.e., print file). If you are running the ANSYS program from the GUI, the FLOTRAN print file is echoed to the output window. The FLOCHECK command aids verification of boundary condition and property specification.

Initialization [FLOCHECK,1] deletes any existing Jobname.PFL and Jobname.RFL files. Run FLOCHECK initialization only when you are sure you no longer need the existing results files.

Main Menu >Preprocessor >FLOTRAN Set Up >Flocheck

Main Menu >Solution >FLOTRAN Set Up >Flocheck

Specifies "FLOTRAN data settings" as the subsequent status topic.

PREP7:Status

	Mp Me St DY LP Th E3 E2 FL PP ED

This is a status [STAT] topic command. Status topic commands are generated by the GUI and will appear in the log file (Jobname.LOG) if status is requested for some items under Utility Menu>List>Status. This command will be immediately followed by a STAT command, which will report the status for the specified topic.

If entered directly into the program, the STAT command should immediately follow this command.

Utility Menu >List >Status >General Postproc >FLOTRAN Module

Reads the residual file written by the FLOTRAN CFD option.

POST1:FLOTRANProcessing

	Mp -- -- -- -- -- -- -- FL PP ED

File name (32 characters maximum) (defaults to Jobname).

File name extension (8 characters maximum). Defaults to RDF (residual file) if Fname is blank.

Directory name (64 characters maximum). Defaults to current directory.

Main Menu >General Postproc >FLOTRAN 2.1A

Specifies data required for a picking operation (GUI).

DATABASE:Picking

	Mp Me St DY LP Th E3 E2 FL PP ED

Field number on the command which uses the picking data. (Count the command name as a field, so that a 2 indicates the first command argument, 3 for the second command argument, etc.) The corresponding field on the command will have a P51X label.

Number of items in the picked list.

Type of items picked:

1 - Node numbers

2 - Element numbers

3 - Keypoint numbers

4 - Line numbers

5 - Area numbers

6 - Volume numbers

7 - Trace points

8 - Coordinate locations (in Global Cartesian coordinates)

9 - Screen picks (in X,Y screen coordinates (-1 to 1))

Data order:

NOOR - Data is not ordered (default).

ORDER - Data is in an ordered list (such as for the E,P51X and A,P51X commands, in which the order of the data items is significant for the picking operation).

Length of number of items describing the list (should equal NARG if Otype=NOOR; default).

Specifies data required for the FITEM command during a picking operation. This is a command generated by the GUI and will appear in the log file (Jobname.LOG) if graphical picking is used. This command is not intended to be typed in directly in an ANSYS session (although it can be included in an input file for batch input or for use with the /INPUT command).

On the log file, FLST will always be followed by one or more FITEM commands which in turn are followed by the ANSYS command that contains a P51X label in one of its fields.

This command is valid in any processor.

This command cannot be accessed directly in the menu.

Calculates the flux passing through a closed contour.

POST1:Magnetics

	Mp Me St -- -- -- E3 E2 -- PP ED

FLUXV invokes an ANSYS macro which calculates the flux passing through a closed contour (path) predefined by PATH. The calculated flux is stored in the parameter FLUX. In a two-dimensional analysis, at least two nodes must be defined on the path. In three dimensions, a path of nodes describing a closed contour must be specified (i.e., the first and last node in the path specification must be the same). A counter-clockwise ordering of nodes on the PPATH command will give the correct sign on flux. Path operations are used for the calculations, and all path items are cleared upon completion. This macro is only available for vector potential formulations.

Main Menu >General Postproc >Elec&Mag Calc >Path Flux

Applies force and torque boundary conditions to an element component.

SOLUTION:MiscLoads

	Mp Me St -- -- -- E3 E2 -- PP ED

Names of existing element components (CM command). Must be enclosed in single quotes (e.g., `CNAM1') when the command is manually typed in.

FMAGBC invokes a predefined ANSYS macro to apply Maxwell and virtual work force and torque boundary conditions to an element component. These boundary conditions are used for subsequent force and torque calculations during solution. Magnetic virtual displacements (MVDI=1) are applied to nodes of elements in the components, and Maxwell surface flags (MXWF) are applied to air elements adjoining the element components. Incorrect force and torque calculations will occur for components sharing adjacent air elements. Companion macros FMAGSUM and TORQSUM can be used in POST1 to summarize the force and torque calculations, respectively. Torque calculations are valid for 2-D planar analysis only. For 2-D harmonic analysis, force and torque represent time-average values.

Main Menu >Preprocessor >Loads >Apply >Flag >Comp. Force/Torque

Main Menu >Solution >Apply >Flag >Comp. Force/Torque

Summarizes electromagnetic force calculations on element components.

POST1:Magnetics

	Mp Me St -- -- -- E3 E2 -- PP ED

Names of existing element components for which Maxwell or virtual work boundary conditions were applied in the preprocessor. Must be enclosed in single quotes (e.g., `CNAM1') when the command is manually typed in.

FMAGSUM invokes an ANSYS macro that summarizes the Maxwell and virtual work forces. The element components must have had appropriate Maxwell or virtual work boundary conditions established in the preprocessor prior to solution in order to retrieve forces (see FMAGBC, SF, BF commands). The forces are also stored on a per-element basis for the adjacent air layer surrounding the components in the element table [ETABLE]. Maxwell forces are stored as items FMX_X, FMX_Y, and FMX_Z, and virtual work forces are stored as items FVW_X, FVW_Y, and FVW_Z. Use the PLETAB and PRETAB commands to plot and list the element table items.

FMAGSUM can also be used to summarize time-average forces from a 2-D harmonic analysis.

Main Menu >General Postproc >Elec&Mag Calc >Comp. Force

Specifies the focus point (center of the window).

GRAPHICS:Views

	Mp Me St DY LP Th E3 E2 FL PP ED

Window number (or ALL) to which command applies (defaults to 1).

Location of the object to be at the focus point (center of the window) in the global Cartesian coordinate system. If XF = AUTO, allow automatic location calculation. If XF = USER, use focus location of last display (useful when last display had auto focus).

Translate key:

0 - Interpret numerical XF, YF, ZF values as described above.

1 - Interpret XF, YF, ZF values as multiples of half-screens to translate from the current position in the screen coordinate system. Example: XF of 2.4 translates the display approximately 2.4 half-screens to the left in the screen X (horizontal) direction.

2 - Interpret XF, YF, ZF values as multiples of half-screens to translate from the current position in the global Cartesian coordinate system. Example: XF of 1.5 translates the display approximately 1.5 half-screens in the global Cartesian X direction of the model.

Notes

Specifies the location on (or off) the model which is to be located at the focus point (center of the window). For section and capped displays, the cutting plane is also assumed to pass through this location (unless the working plane is used via /CPLANE). See also /AUTO and /USER commands.

This command is valid in any processor.

Utility Menu >PlotCtrls >Pan, Zoom, Rotate

Utility Menu >PlotCtrls >View Settings >Focus Point

Calculates magnetic forces on a body.

POST1:Magnetics

	Mp Me St -- -- -- E3 E2 -- PP ED

FOR2D invokes an ANSYS macro which calculates magnetic forces on a body that is completely surrounded by air (symmetry permitted). The calculated forces are stored in the parameters FX and FY. In interactive mode, a node plot is produced with the integration path highlighted. A predefined closed path [PATH], passing through the air elements surrounding the body, must be available for this calculation. A counter-clockwise ordering of nodes on the PPATH command will give the correct sign on the forces. Forces are calculated using a Maxwell stress tensor approach. The macro is valid for two-dimensional planar or axisymmetric analysis. Path operations are used for the calculations, and all path items are cleared upon completion.

Main Menu >General Postproc >Elec&Mag Calc >Mag Forces

Selects the element nodal force type for output.

POST1:Controls POST26:Controls

	Mp Me St -- LP -- E3 E2 -- PP ED

Type of force to be associated with the force items:

TOTAL - Total forces (static, damping, and inertia).

STATIC - Static forces.

DAMP - Damping forces.

INERT - Inertia forces.

Notes

FORCE selects the element nodal force type for output with the POST1 PRESOL, PLESOL, PRRFOR, NFORCE, FSUM, etc. commands, the POST26 ESOL command, and reaction force plotting [/PBC]. For example, FORCE,STATIC causes item F of the PRESOL command to be the static forces for the elements processed. Element member forces (such as those available for beams and shells) are not affected by this command. Damping and inertia forces are only available for full transient and harmonic analyses.

The PRRSOL command is not valid with FORCE. Use the PRRFOR command, which provides the same functionality as PRRSOL, instead.

Main Menu >General Postproc >Options for Outp

Main Menu >TimeHist Postpro >Define Variables

Main Menu >TimeHist Postpro >Elec&Mag >Circuit >Define Variables

Utility Menu >List >Results >Options

Specifies the format of the file dump.

AUX2:BinaryFiles

	Mp Me St DY LP Th E3 E2 FL PP ED

Format:

RECO - Basic record description only (minimum output) (default).

TEN - Same as RECO plus the first ten words of each record.

LONG - Same as RECO plus all words of each record.

Notes

Specifies the format of the file dump (from the DUMP command).

Utility Menu >File >List >Binary Files

Utility Menu >List >Files >Binary Files

Specifies format controls for tables.

POST1:Listing

	Mp Me St DY LP Th E3 E2 FL PP ED

Number of digits (3 to 32) in first table column (usually the node or element number). Initially defaults to 7.

FORTRAN format types (initially defaults to G):

G - Gxx.yy. xx and yy are described below.

F - Fxx.yy

E - Exx.yy

Total width (9 to 32) of the field (the xx in Ftype). Initially defaults to 12.

Number of digits after the decimal point (yy in F or E format) or number of significant digits in G format. Range is 2 to xx-7 for Ftype=G or E; and 0 to xx-4 for Ftype=F. Initially defaults to 5.

Number of lines (11 minimum) per page. Defaults to ILINE or BLINE from the /PAGE command.

Number of characters (41 to 240, system-dependent) per line before wrap-around. Defaults to ICHAR or BCHAR from the /PAGE command.

Notes

Specifies various format controls for tables printed with the POST1 PRNSOL, PRESOL, PRETAB, PRRSOL, and PRPATH commands. A blank (or out-of-range) field on the command retains the current setting. Issue /FORMAT,STAT to display the current settings. Issue /FORMAT,DEFA to reestablish the initial default specifications.

This command is valid in any processor.

This command cannot be accessed directly in the menu.

Defines the fatigue S vs. N and Sm vs. T tables.

POST1:Fatigue

	Mp Me St DY LP -- -- -- -- PP ED

Starting item number for entering properties (defaults to 1). If 1, data input in field C1 of this command is entered as the first item in the list; if 7, data input in field C1 of this command is entered as the seventh item in the list; etc. If the item number is negative, C1-C6 are ignored and the item is deleted. If -ALL, the table is erased. Items are as follows (items 41-62 are required only if simplified elastic-plastic code calculations are to be performed):

1,2,...20: - N1,N2,...N20

21,22,...40: - S1,S2,...S20

41,42,...50: - T1,T2,...T10

51,52,...60: - Sm1,Sm2,...Sm10

61: - M (first elastic-plastic material parameter)

62: - N (second elastic-plastic material parameter)

Data inserted into six locations starting with STITM. If a value is already in one of these locations, it will be redefined. A blank retains the previous value.

Defines the fatigue alternating stress (S) vs. cycles (N) table and the design stress-intensity value (Sm) vs. temperature (T) table. May also be used to modify any previously stored property tables. Log-log interpolation is used in the S vs. N table and linear interpolation is used in the Sm vs. T table. Cycles and temperatures must be input in ascending order; S and Sm values in descending order. Table values must be supplied in pairs, i.e., every N entry must have a corresponding S entry, etc. Not all property pairs per curve need be used. If no S vs. N table is defined, the fatigue evaluation will not produce usage factor results. See the ANSYS Structural Analysis Guide for details.

Main Menu >General Postproc >Fatigue >Elas-plas Par

Main Menu >General Postproc >Fatigue >S-N Table

Main Menu >General Postproc >Fatigue >Sm_T Table

Main Menu >General Postproc >Fatigue >Erase Tables

Lists the property table stored for fatigue evaluation.

POST1:Fatigue

	Mp Me St DY LP -- -- -- -- PP ED

Main Menu >General Postproc >Fatigue >List Tables

Defines the frequency points for the SV vs. FREQ tables.

SOLUTION:SpectrumOptions

	Mp Me St -- LP -- -- -- -- PP ED

Frequency points for SV vs. FREQ tables. Values must be in ascending order. Log-log interpolation will be used between frequency points. FREQ1 should be greater than zero. Units are cycles/time.

Notes

Repeat FREQ command for additional frequency points (20 maximum). Values are added after the last nonzero frequency. If all fields (FREQ1 - FREQ9) are blank, erase SV vs. FREQ tables.

Frequencies must be in ascending order. Use STAT command to list current frequency points. Spectral values are input with the SV command and interpreted according to the SVTYP command. Applies only to the SPRS (single-point) option of the SPOPT command. See the PSDFRQ command for frequency input with the MPRS (multi-point) option.

This command is also valid in PREP7.

Main Menu >Preprocessor >Loads >Spectrum >Erase Table

Main Menu >Preprocessor >Loads >Spectrum >Freq Table

Main Menu >Solution >Spectrum >Erase Table

Main Menu >Solution >Spectrum >Freq Table

Stores fatigue stress components at a node.

POST1:Fatigue

	Mp Me St DY LP -- -- -- -- PP ED

Node number corresponding to this location. Used only to associate a node with a new location or to find an existing location.

Event number to be associated with these stresses (defaults to 1).

Loading number to be associated with these stresses (defaults to 1).

Starting item number for entering stresses (defaults to 1). If 1, data input in field C1 of this command is entered as the first item in the list; if 7, data input in field C1 of this command is entered as the seventh item in the list; etc. Items are as follows:

1-6: - SX,SY,SZ,SXY,SYZ,SXZ total stress components

7: - Temperature

8-13: - SX,SY,SZ,SXY,SYZ,SXZ membrane-plus-bending stress components.

Stresses assigned to six locations starting with STITM. If a value is already in one of these locations, it will be redefined. A blank retains the previous value (except in the C1 field, which resets the STITM item to zero).

Stores fatigue stress components at a node as input on this command instead of from the current data in the database. Stresses are stored according to the event number and loading number specified. The location is associated with that previously defined for this node [FL] or else it is automatically defined. May also be used to modify any previously stored stress components. Stresses input with this command should be consistent with the global coordinate system for any FSNODE or FSSECT stresses used at the same location.

Main Menu >General Postproc >Fatigue >Specified Val

Scales force load values in the database.

SOLUTION:FEForces

	Mp Me St -- LP Th E3 E2 -- PP ED

Scale factor for the real component. Zero (or blank) defaults to 1.0. Use a small number for a zero scale factor.

Scale factor for the imaginary component. Zero (or blank) defaults to 1.0. Use a small number for a zero scale factor.

Scales force load (force, heat flow, etc.) values in the database. Scaling applies to the previously defined values for the selected nodes [NSEL] and the selected force labels [DOFSEL]. Issue FLIST command to review results. Solid model boundary conditions are not scaled by this command, but boundary conditions on the FE model are scaled. (Note that such scaled FE boundary conditions may still be overwritten by unscaled solid model boundary conditions if a subsequent boundary condition transfer occurs.)

This command is also valid in PREP7.

Main Menu >Preprocessor >Loads >Operate >Forces

Main Menu >Solution >Operate >Forces

Deletes a stress condition for a fatigue location, event, and loading.

POST1:Fatigue

	Mp Me St DY LP -- -- -- -- PP ED

Delete stresses associated with location NLOC. Defaults to zero.

Delete stresses associated with event NEV. Defaults to zero.

Delete stresses associated with loading NLOD. Defaults to zero.

Deletes a stress condition stored for a particular fatigue location, event, and loading. Use FE command to delete all stresses for a particular event or FL command to delete all stresses for a particular location.

Main Menu >General Postproc >Fatigue >Dele Stresses

Lists the stresses stored for fatigue evaluation.

POST1:Fatigue

	Mp Me St DY LP -- -- -- -- PP ED

List stresses from NLOC1 (defaults to 1) to NLOC2 (defaults to NLOC1) in steps of NINC (defaults to 1). If NLOC1 = ALL, NLOC2 and NINC are ignored and stresses for all locations are listed.

Event number for stress listing (defaults to ALL).

Loading number for stress listing (defaults to ALL).

Stresses may be listed per location, per event, per loading, or per stress condition. Use FELIST and FLLIST if only event and location parameters (no stresses) are to be listed.

Main Menu >General Postproc >Fatigue >List Stresses

Calculates and stores the stress components at a node for fatigue.

POST1:Fatigue

	Mp Me St DY LP -- -- -- -- PP ED

Node number for which stress components are stored.

Event number to be associated with these stresses (defaults to 1).

Loading number to be associated with these stresses (defaults to 1).

Calculates and stores the total stress components at a specified node for fatigue. Stresses are stored according to the event number and loading number specified. The location is associated with that previously defined for this node [FL] or else it is automatically defined. Stresses are stored as six total components (SX through SYZ). Temperature is also stored along with the total stress components. Calculations are made from the stresses currently in the database (last SET or LCASE command). Stresses stored are in global Cartesian coordinates, regardless of the active results coordinate system [RSYS]. The FSLIST command may be used to list stresses. The FS command can be used to modify stored stresses.

Main Menu >General Postproc >Fatigue >From rst File

Displays a fatigue stress item for a fatigue location and event.

POST1:Fatigue

	Mp Me St DY LP -- -- -- -- PP ED

Display stresses associated with location NLOC.

Display stresses associated with event NEV.

Display stresses associated with item number ITEM. Items are as follows:

1-6: - SX,SY,SZ,SXY,SYZ,SXZ total stress components

7: - Temperature

8-13: - SX,SY,SZ,SXY,SYZ,SXZ membrane-plus-bending stress components.

Displays a fatigue stress item as a function of loading number for a particular fatigue location and event.

Main Menu >General Postproc >Fatigue >Plot Stresses

Calculates and stores total linearized stress components.

POST1:Fatigue

	Mp Me St DY LP -- -- -- -- PP ED

In-plane (X-Y) average radius of curvature of the inside and outside surfaces of an axisymmetric section. If zero (or blank), a plane or 3-D structure is assumed. If nonzero, an axisymmetric structure is assumed. Use a suitably large number (see Section 19.4.2 of the ANSYS Theory Reference) or use -1 for an axisymmetric straight section.

Event number to be associated with these stresses (defaults to 1).

Loading number to be associated with these stresses (defaults to 1).

For an axisymmetric analysis (RHO#0):

0 - Include the thickness-direction bending stresses

1 - Ignore the thickness-direction bending stresses

Calculates and stores the total linearized stress components at the ends of a section path [PATH] (as defined by the first two nodes with the PPATH command). Stresses are stored according to the fatigue event number and loading number specified. Locations (one for each node) are associated with those previously defined for these nodes [FL] or else they are automatically defined. Stresses are separated into six total components (SX through SXZ) and six membrane-plus-bending (SX through SXZ) components. The temperature at each end point is also stored along with the total stress components. Calculations are made from the stresses currently in the database (last SET or LCASE command). Stresses are stored as section coordinate components if axisymmetric or as global Cartesian coordinate components otherwise, regardless of the active results coordinate system [RSYS]. The FSLIST command may be used to list stresses. The FS command can be used to modify stored stresses. See also the PRSECT and PLSECT commands for similar calculations.

Main Menu >General Postproc >Fatigue >At Cross Sect

Sums the nodal force and moment contributions of elements.

POST1:SpecialPurpose

	Mp Me St -- LP Th E3 E2 -- PP ED

Coordinate system in which to perform summation.

<blank> - Sum all nodal forces in global Cartesian coordnate system (default).

RSYS - Sum all nodal forces in the currently active RSYS coordinate system.

Sums and prints, in each component direction for the total selected node set, the nodal force and moment contributions of the selected elements attached to the node set. Selecting a subset of nodes [NSEL] and then issuing this command will give the total force acting on that set of nodes. Nodal forces associated with surface loads are not included. The effects of nodal coupling and constraint equations are ignored. Moment summations are about the global origin unless another point is specified with the SPOINT command. This vector sum is printed in the global Cartesian system unless it is transformed [RSYS] and a point is specified with the SPOINT command. By default, the sum is done in global Cartesian, and the resulting vector is transformed to the requested system.

The LAB=RSYS option transforms each of the nodal forces into the active coordinate system before summing and printing. The FORCE command can be used to specify which component (static, damping, inertia, or total) of the nodal load is to be used. This command output is included in the NFORCE command.

This command should not be used with axisymmetric elements.

Main Menu >General Postproc >Nodal Calcs >Total Force Sum

Performs fatigue calculations for a particular node location.

POST1:Fatigue

	Mp Me St DY LP -- -- -- -- PP ED

Location number of stress conditions to be used for fatigue calculation.

Node number (used only for convenience if NLOC is not input).

Main Menu >General Postproc >Fatigue >Calculate Fatig

Transfers solid model forces to the finite element model.

SOLUTION:SolidForces

	Mp Me St -- LP Th E3 E2 -- PP ED

Forces are transferred only from selected keypoints to selected nodes. The FTRAN operation is also done if the SBCTRAN command is issued or automatically done upon initiation of the solution calculations [SOLVE].

This command is also valid in PREP7.

Main Menu >Preprocessor >Loads >Operate >Forces

Main Menu >Solution >Operate >Forces

Defines the fatigue data storage array.

POST1:Fatigue

	Mp Me St DY LP -- -- -- -- PP ED

Maximum number of fatigue locations (defaults to 5).

Maximum number of fatigue events (defaults to 10).

Maximum number of loadings in each event (defaults to 3).

Notes

Defines the size and erases the stress conditions for the fatigue data storage array. A stress condition is a loading (stresses) at a particular location (node) for a particular event. Size is defined in terms of the maximum number of locations, events, and loadings. The array size cannot be changed once data storage has begun (without erasing all previously stored data). If a size change is necessary, see the FTWRITE command.

Main Menu >General Postproc >Fatigue >Size Settings

Writes all currently stored fatigue data on a file.

POST1:Fatigue

	Mp Me St DY LP -- -- -- -- PP ED

File name (32 characters maximum). Defaults to Jobname.

File name extension (8 characters maximum). Defaults to FATG if Fname is blank.

Directory name (64 characters maximum). Defaults to current directory.

· Data are written in terms of the equivalent POST1 fatigue commands [FTSIZE, FL, FS, etc.] which you can then edit and resubmit to POST1 (with a /INPUT command).

· Once you have created a fatigue data file, each subsequent use of the FTWRITE command overwrites the contents of that file..

Menu Paths

Main Menu >General Postproc >Fatigue >Write Fatig Data

Assigns an external or internal type to a binary file.

SESSION:Files

	Mp Me St DY LP Th E3 E2 FL PP ED

ANSYS file name identifier. Valid identifiers are: EMAT, ESAV, FULL, REDM, SUB, MODE, TRI, DSUB, USUB, EROT, OSAV, and SELD. See the ANSYS Basic Analysis Procedures Guide for file descriptions. If ALL, apply type to all valid files.

Type key:

EXT - External type file.

INT - Internal type file.

Notes

Binary files may be of type external or internal. Internal files are unformatted and usually use the system's default bit representation of data. External files are unformatted and use 2's complement integer representation and IEEE double precision (64 bit) representation. Some computer systems use the external representation for their internal files. See the ANSYS Basic Analysis Procedures Guide for details. Binary files with an external representation are transportable between different computer systems, whereas binary files with an internal representation are not.

This command is valid only at the Begin Level.

Utility Menu >File >ANSYS File Options

Generates nodes and tetrahedral volume elements from detached exterior area elements (facets).

PREP7:Meshing

	Mp Me St DY LP Th E3 E2 FL PP ED

Specifies whether to keep the area elements after the tetrahedral meshing operation is complete.

0 - Delete area elements (default).

1 - Keep area elements.

The FVMESH command generates a tetrahedral volume mesh from a selected set of detached exterior area elements (facets). (Detached elements have no solid model associativity.) The area elements can be triangular-shaped, quadrilateral-shaped, or a mixture of the two.

The FVMESH command is in contrast to the VMESH command, which requires a volume to be input.

The main tetrahedra mesher [MOPT,VMESH,MAIN] is the only tetrahedra mesher that supports the FVMESH command. The alternate tetrahedra mesher [MOPT,VMESH,ALTERNATE] does not support FVMESH.

Tetrahedral mesh expansion [MOPT,TETEXPND,Value] is supported for both the FVMESH and VMESH commands. Tet-mesh expansion is the only mesh control supported by FVMESH.

The FVMESH command does not support multiple "volumes." If you have multiple volumes in your model, select the surface elements for one "volume," while making sure that the surface elements for the other volumes are deselected. Then use FVMESH to generate a mesh for the first volume. Continue this procedure by selecting one volume at a time and meshing it, until all of the volumes in the model have been meshed.

If an error occurs during the meshing operation, the area elements are kept even if KEEP=0.

Main Menu >Preprocessor >Mesh >Area Elements