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Writing *.bc file through TUI


Writing a boundary condition file through TUI poses the following problem.<br><br>Say a case consists of steady/unsteady profile. The user then tries to write a *.bc file for such a...

Apply momentum source term in the given direction during 6DOF MDM simulation


In certain situations, users need to apply momentum source term in the body-fixed coodinate system while the body is in 6 degree-of-freedom motion in the earth-fixed coordinate...

POLYSTAT : unable do simultaneously display curves from different families (in DRAW STAT mode)


In a session, the user successively defines probability and density-of-probability curves. After that, RUN and DRAW STAT functionalities are invoked. The first family of curves can be selected,...

Setting Surface Monitors for Transient Case through TUI


While setting the surface monitors through TUI for a Transient case following problem is observed.<br>In the GUI for surface monitors, there is an option for plotting. One can select under...

Eliminating the need for multiple DEFINE_SOURCE UDFs


Often, a problem has multiple source terms (continuity, energy, species, etc.) When UDFs are used for each to compute sources, it is cumbersome because separate DEFINE_SOURCE macros are often used...

Modeling thermostat cycle operation in Airpak


How we can simulate following problem in Airpak:<br><br>Whenever the room temperature went above a certain value, Airpak turned<br>off the heating air supply in the room. ...

blower modeling notes


The Body Fo<br>(1) Mesh Size<br><br>Don't under-resolve the blower. Make sure you have enough cells to adequately resolve all of the relevant geometry (e.g. blades, hub...

FLUENT 6 - Printing to the GUI or to an output file from UDFs


Output from a UDF using Message() only prints to the GUI. If the output is desired to go to a file, the fprintf function is commonly used. How can one easily switch between the two without...

Icepak FAQ: How to convert Flotherm Model to Icepak


Do you have any type of converter that we could use to convert Flotherm model files to Icepak?<br><br> In general you can use one of the two ways:<br><br> 1. Flotherm...

POLYFLOW - Evaluating the force components vs. position on a screw (MST)


How to get the profiles of forces on the screws along flow direction?<br><br>So far, there is no direct post-processor for evaluating the total force distribution (Fx, Fy, Fz) along...

Boolean operations with Adaption Registers


User's Guide contains the description of the operations which can be used through Adapt>Manage panel.<br>However, the names of these operations ("Mask"...

How to get the volume of filled region in a VOF prolem in Fidap


How to get the volume occupied by fluid region in a VOF prolem in Fidap<br>When you run a VOF simulation, the volume occupied by fluid region will be reported in FDSTAT file at each time...

MixSim 2.0: cannot create or load model after installation of FLUENT 6.2.16 -- crash in fluent.exe


On a Windows system, FLUENT 6.2.16 was installed in the same ...Fluent.Inc area as MixSim 2.0.<br>MixSim can still be launched.<br>The user selects "File --- New Model"...

POLYDATA - error while loading shared libraries: libgtk-1.2.so.0: cannot open shared object file. No such file or directory


When running POLYDATA or POLYFLOW, it may happen that shared libraries be not bound.<br>Presently, the user should perhaps ask the assistance of a system manager, and provide the following...

POLYFLOW - How to recover the Trouton ratio of 3?
How to model strain hardening with a generalised Newtonian (non-Newtonian inelastic) fluid model?


<br>From the analytical point of view, when one uses tensorial form for the constitutive equation of a Newtonian fluid, one actually obtains the uniaxial elongational viscosity as predicted...

FLUENT - Easy way to compute distances and vector direction from graphics


Users have asked for an easy method to compute distances, vector components, and<br>unit vector starting from two points picked manually in FLUENT graphics window.<br>This Scheme...

POLYMAT: evaluation of the norm of the deviation between data and model for the spectrum.


How does POLYMAT evaluate the norm of the deviation between data and model for the spectrum?<br>Each experimental curve c is known as a list of (Xi,Yi_e), for i = 1,n. For each Xi, the...

POLYFLOW - evaluation of a typical wall shear rate


Considering a flow rate Q, and some geometric dimensions (width L, half height H, radius R), what is a typical wall shear rate g-dot?<br>The formulae below provide typical values; they...

After Writing a Particle Tracking File it has zero bytes


When running Fluent in Network Parallel and writing a particle tracking file you find that is has zero bytes when completed.<br><br>These are the steps necessary to take when writing...

SetupCryptoClient:CryptAcquireContext(...) failed


Attempting to Re-Register the MPICH username and password you receive this error:<br><br>SetupCryptoClient:CryptAcquireContext(...) failed, error:<br>-2146893809 Error Text:...

Problem in Function Hooks panel, to hook cavitation udf, for a new case set up in Fluent 6.2


When a new case is set up in Fluent 6.2 for a cavitation problem with a udf, by default "Cavitation Mass Rate" option is not avialable, in Define-->User...

POLYFLOW - loss of convergence for Darcy flow through a non-isotropic porous media


When defining a non-isotropic porous media, e.g. with Pxy = Pyy = 0 for a 2D case, the calculation may diverge and shows oscillatory behaviour in the Darcy pressure.<br>When changing Pyy =...

Post processing VOF cases with more than two phases


In VOF problems with more than 2 phases, there is no direct variable to visualize all the three phases simultaneously. The custom field function below would help in visualizing all three phases...

POLYFLOW - viscous heating for isothermal viscoelastic flow


Can one evaluate the viscous dissipation and the dissipated power on the flow domain for a viscoelastic flow?<br><br>The user should ask for the post-calculation of both...

POLYFLOW - how to obtain CSV information for a field on a restricted topological entity (e.g. a boundary)?


How to obtain CSV information for a field on a restricted topological entity (e.g. a boundary)?<br>Create a sub-model on the required topological entity; vanishing forces (or vanishing flux)...