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preserve internal volumes when an ANSYS mesh is imported in Fluent


All the internal volumes are lost once an ANSYS mesh is imported in Fluent.<br>To be able to preserve the internal volumes once that you import a mesh<br>from ANSYS in Fluent, one...

How to easily turn off visibility of all but a small subset of objects


Imagine a complex model in Gambit consisting of several volumes, all of which are currently visible. Now imagine you want to focus your efforts on a single volume or a small subset of those...

Export of forces in Nastran format through TUI


No command is available in Fluent6.0.20 to export forces in Nastran format through TUI.<br><br>Scheme file attached at the end of this text would allow to export force in NASTRAN...

FLUENT 6 - Transient Velocity Profile for Moving Wall


How can I assign a transient velocity profile to a moving wall ?<br>The following UDF will perform the job :<br><br>--------------------<br><br>#include...

Saving an adaption register for subsequent use


When a register is created for adaption or other post-processing purposes, it is lost once you use it or after you save the case.<br>There is basically no direct way to preserve the register...

Improved convergence settings for problem with only energy eqn and disparity in thermal conductivities


Problem containing only solid zones.... solving only energy eqn.<br>Different zones had vast disparity in thermal conductivities.<br><br><br>Default Multigrid setting on...

Fluid residence time


Compute fluid residence time.<br><br>Problem solved via UDF using user-defined scalars. Source code for UDF is below.<br><br>1. Compile udf<br>2. Read case.... set...

FIDAP - How to SUPERIMPOSE plots


There are two ways to superimpose in FIPOST. When using the gui: click Environment, then change the value of SUPERIMPOSE to ON or OFF as desired, and then click on the...

How to use a transient boundary profile in Fluent 6


A transient boundary condition can be defined in FLUENT 6 with User Defined Functions (UDFs) or boundary profiles. It is very easy to write a UDF to define a temporally varying boundary condition...

Macro Heat Exchanger Model Theory


Some salient features of Macro Heat Exchanger Model Theory.<br><br>Macro Heat Exchanger Model Theory<br>---------------------------------<br>A....

How to find Heat Exchanger NTU


Given Raw Heat Exchanger (HXC) data, how to determine NTU - NTU_full (mdot_air_full) ? See Solution 623.<br>HOW to calculate NTU given a raw heat exchanger data?<br><br>The heat...

Reading (interpolating) source term from point data input file not aligned with grid


Client has source terms (for energy eqn) that are not aligned with grid. How can this source term data be interpolated.<br>The solution is several steps and involves a UDF (that should be...

Modelling 1-D radiation in small gaps (between wall and its shadow thread)


Client wants to model radiative h.t. between two solids separated by small gap.<br><br>DESCRIPTION<br>============<br>This solution contains a UDF which gives the user a...

UDF to compute forces and moments (torques) on surface zones and print results to file


Currently, Fluent cannot print force/moment data to file, only to screen.<br>SYNOPSIS<br>=========<br>* UDF and SCHEME interface have been added to compute surface...

memory limit on 32 bit machines


One of my clients hit the 2GB limit of RAM being used on a 32 bit machine.<br> Is this limit per processor? That is, can running parallel on 2CPU's give access to the total of 4GB...

How to set coal volatile and carbon content when wet combustion option is used?


It is not clear in documentation how to set the material properties for volatiles and char fraction when wet combustion option is used for a solid fuel combustion case.<br>The volume...

How to calculate absorption coefficient for dirty water in a UV application?


UV disinfection systems are used to kill bacteria in water. UV Lamps emit radiation that has germicidal effect. In this industry, water transmittance is used to describle the quality of water....

Non-conformal interface vreation with periodic boundaries


It is sometimes inevitable to merge two or more meshes with periodic boundaries and create non-conformal interfaces between them. For example, half-domain meshes for swirler, mixer, and chamber...

batch running fluent sessions sequentially in W2K environment


User wanted to run two fluent sessions one after the other. The .bat file containing the fluent command caused simultaneous running of the processes whereas client wanted to run sequentially as he...

GAMBIT - POLYDATA - Creation of an internal PMESH of dimension N-1


When creating a PMESH in GAMBIT, I may get troubles in using it in POLYDATA. For example, it is merged with another boundary, or I cannot define a bubbling problem, etc.<br>Internal PMESHES...

To create transient Ensight case and data files from data files which were saved at discrete time steps.


In FLUENT 6.0.20, transient Ensight case and data files cannot be exported.<br>If there are case and data files saved at discrete time steps in FL6.0.20, these data files<br>can be...

Error: sopenoutputfile: unable to open file for output


Error: sopenoutputfile: unable to open file for output<br>Error Object: "c:tempkill-fluent1500"<br><br>Problem Description: Fluent 6.1.18 upon startup is designed...

turbulence intensity values displayed by Fluent are different from what they should be


Users somtimes notice that in the FLUENT post-processing, the turbulence intensity gives bogus values (very large or very small) and associates that to a display problem.<br>When they...

The operating pressure is stored in both case and data files


Let's setup a problem ("case1.cas", "case1.dat") with a certain operating pressure Pop1.<br>Modify "case1.cas" by changing thse operating...

Information on starting Fluent process with different options


Provide some information on the different options available when starting a FLUENT process.<br>1) Using option -cl<br>While starting the FLUENT process it is possible to pass some...