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# POLYDATA - POLYFLOW : how to define a PMAT on heat flux boundary condition?

The heat flux boundary condition q is described as q = q0 + alpha.(T-Talpha) + sigma (T^4). In other words, it consists successively of a constant part, a convective part and a radiative part. ...

# FLUENT 6 - To Implement Brownian Motion With variable Cunningham Correction Factor

When the default Brownian motion of FLUENT is used in DPM it assumes a constant Cunningham correction factor. But because of the pressure drop across the orifices, the Cunningham might not be a...

# How to resent iteration counter and residual scaling values

For external aero simulations involving both low and high speed<br>regions, it is often the practice to start the simulation using<br>the segregated solver and obtain second-order...

# Useful scheme commands

Here are some useful scheme commands, which can be used to access, residuals value, number of cells marked for refinement.<br>(%iterate 0); will return the current iteration ...

# To call a external program from Fluent using UDF.

Some times, it is necessary to couple a Fluent simulation with an external program, (MATLAB/SIMULINK etc.)<br>This can be achieved using a UDF macro DEFINE_ADJUST or...

# Using the gradient of volume fraction effectlively

The gradient of volume fraction is not stored by default. Trying to use the macro C_VOF_G results in segmentation violation. Here is an adjust function that allocates memory for vof gradients and...

# Heat flux at the boundary

The gradient of temperature is not available at the boundary faces. But the<br>In my test case I had a wall surface with id =6 and defined a heat flux bc there. The following UDF implemented...

# MixSim2.0: Free liquid surface doesn't appear where it should ("LiquidLevel" parameter not obeyed)

When the "LiquidLevel" parameter in the "Cylindrical Tank" object is defined as an equation (as opposed to an explicit value), the liquid level will be wrong, and/or...

# Converting resistance coefficients from STAR to Fluent for porous media

Some users got the STAR resistance coefficients of a porous media and they would like to apply them to Fluent. It is important to notice that the resistance coefficients are different in Fluent...

# Compilation of UDF fails on IBM Power 3

On compiling a UDF on IBM Power 3, the system reports the following problem:<br><br>/bin/sh: cc: not found.<br>make[3]: *** [udf_names.o] Error 127<br>The indication is...

# How can I automate printing of results at some nodes for transient simulation in FIPOST?

To print x component of velocity at node 64 at time steps 1,11,21,31, to 101 to the .FIOUT file.<br>To print temperature at node 64 at time steps 1,11,21,31 to 101 to the .FIOUT file, read...

# Simulate multiple mixtures by thread id

In multiple species problems, there can only be ONE mixture. This is a problem in multiple channel flows with different fluid types, especially in cases where one of the fluids is a multiple...

# Fluent 6.1.22 can't remove unreferenced faces of hexcore

When the mesh has faces that are not attached to any cells or faces that are attached to cells/zones that have a type 'dead', FLUENT is supposed to delete those faces and dead...

# Verify the setup of a FLUENT case for sloshing / filling simulations using VOF Geo-Reconstruct formulation

Users need to change many default settings when putting together a Fluent case for sloshing / filling simulations using VOF Geo-reconstruct formulation.<br>A document with a...

# Compiling FIDAP User Defined Subroutines (UDS) - Windows and Unix/Linux

NOTE:<br><br>Instructions at the links below:<br><br>Windows - <a target=_blank...

# Enabling Fieldview in Polyman

<br><a target=_blank...

# Setting the HOMEDIR Environment Variable in POLYMAN

Instructions given at the link below:<br><br><br><a target=_blank...

# Running POLYFLOW in Parallel

Instructions given at the link below:<br><br><br><a target=_blank...

# Displaying Grids or Contours in FLUENT Produces an Error Message

Instructions given at the link below:<br><br><br><a target=_blank...

# HOME ENVIRONMENT must be set!

This message will pop up when you are trying to open GAMBIT incorrectly usually from double-clicking on the wrong executable within Windows. GAMBIT has two executable files (gambit.exe). The one...

# Invalid Returned Data from License Server

This is a network/firewall issue and needs to be resolved on your end.<br><br>If you have recently installed any new software this could be the culprit especially if the software has a...

# Mesh color in Gambit

Due to postprocessing reasons such a printing, one migt want to change the default background and mesh colors.<br>This can be simply done by changing defaults in Edit/Defaults/Geometry.....

# How to retrieve the subgrid turbulent kinetic energy for the LES turbulence model from within a UDF ?

FLUENT's implementation of LES model doesn't explicitly solve the equation for the subgrid turbulent kinetic energy. However, this variable is available during post-processing under...

# msh file format

Client wants basic format for creating msh file. He wants to write filter for Ensight to Fluent directly.<br><br>CREATING A FLUENT MESH BY...

# Fluent / Tgrid / MixSim graphics slow and/or flickering -- opengl / glx driver

This was found on Linux (fluent_arch1.0 reports "lnx86"), but may be applicable to other platforms as well.<br>This is applicable to, amongst others, FLUENT 6.1 and Tgrid...