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... |