# SiteMap Page 37

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# What size of MRF should be used for axial fans (e.g. Underhood cooling fans)?

Underhood environment has become very congested; therefore, the MRF used to model the cooling fans has become very small. A common question: How small can I make the MRF?<br>Some facts about...

# POLYDATA - disable prediction on velocity field (contact problem)

When defining a simulation involving contact, POLYDATA informs the user that the prediction on the velocity field is disabled. What does it mean actually?<br>For solving a transient...

# Calculation of volume of a register - How to determine the volume of a cloud with a certain range of a species?

How to determine the volume of a cloud with a certain range of a species<br>concentration?<br>1. Mark the cells with a a species mass fraction INSIDE of<br>ISO-MIN and...

# Domain creation from cell zones in tgrid

How to create domain from cell zones in tgrid ?<br><br>The following feature is available in tgrid 3.6 releases. In order to create the domain from cell zones use following text user...

# FLUENT 6 - Creating an animation in a 3d VOF case

There might be an instance of an application where iso-surface of half the maximum value of volume fraction of secondary phase needs to be displayed. A typical application where this need arises...

# Can I restart the job if it is interrupted due to power failure or some other unexpected event?

The FiDAP job was interrupted before completion. Is it possible to restart the simulation from where it left off?<br><br>Yes, FIDAP automatically backs up the results in the...

# Is is possible to change the time between backups of the FDPOST (results) file?

The user would like to save the results more (or less) frequently.<br>By default, FIDAP automatically backs up the results in the FISOLV.####<br>scratch directory to ident.FDPOST in...

# How much memory si required for my simulation?

The user would like to estimate how much memory would be required for a given mesh size.<br><br>The following numbers are for a linear mesh using the segregated iterative solver. The...

# Chaniging a material property causes the V.O.F. simulation to diverge.

A VOF simulation that was converging, now has convergence problems.<br>Check for the following error at the end of your FDSTAT file:<br><br>***** E X E C U T I O N E R R O R (...

# Fluent graphics might not display or you receivie a segmentation violation when using Remote Desktop Connection

Launching Fluent from a client machine using Remote Desktop Connection might prevent you from viewing graphics or you receive a segmentation violation when viewing...

# Decreasing skewness of volume mesh in Tgrid

There might be instances when the skewness of volume mesh needs to be decreased from the maximum value. Once volume mesh is created from the surface mesh, following steps could be adopted to...

# POLYFLOW - Too many holes: Calibrating the parameters for the Darcy equation

Let us assume a flow through a large channel, whose exit consists of several small holes of length L, as illustrated in the figure Darcy_equation_holes.gif attached below. Not only the generation...

Unsteady DPM injection will release particles at the beginning of every timestep.<br>If the timestep size is very small and the elapsed time of the simulation is long, this<br>will...

# Variable timestep size for coupled dynamic mesh problem

Coupled dynamic mesh problem adjusts the motion of the moving body/surfaces<br>based on the computed aerodynamic load and applied external forces at...

# Solution process for supersonic ramped-inlet

Supersonic ramped inlet problems are difficult to run. The incoming flow<br>is supersonic (Mach 2-3) and the fan face has a high pressure and the flow<br>is subsonic. It is difficult...

# Can a deformed geometry/mesh be exported to GAMBIT?

The user would like to export a deformed mesh/geometry from a free surface or FSI simulation so that it can be remeshed in GAMBIT. This is useful when mesh distortions are so high they are...

# How to avoid parcels being deleted in DPM with Droplet breakup model

When the particle collision-breakup model is used, streams with insignificant mass or numbers in parcel are deleted. It is possible to decrease the minimum mass or number of particles in...

# Y+ grid adaption in Eulerian model

Y+ grid adaption gives segmentation violation if "per phase" or "dispersed" model is used under k-epsilion turbulence model. Even marking the grid is not possible with...

# How to create a curve in Gambit for f(xi) = 0?

How to create an arbitrary curve in Gambit for f(x,y,z) = 0?<br>You will need to calculate and print the x,y,z coordinates of the points lying on the curve in ICEM INPUT format. The format...

# Profile of fixed value in a fluid zone using a DEFINE_PROFILE function

It is possible to implement an analytical profile of fixed values to the fluid zone. But the DEFINE_PROFILE function has to be modified a little bit to fit the loop over all the cells. The...

# UNC paths are not supported. Defaulting to Windows directory. The system cannot find the file specified.

When trying to LOAD a compiled UDF when running Fluent Network Parallel you get this error message.<br><br>Explanation: The Move or Copy command in a Command Prompt window does not...

# X server for Win32 has encountered a problem and needs to close

When trying to open up GAMBIT or FIDAP this error message appears and GAMBIT or FIDAP will not start up. X server for Win32 has encountered a problem and needs to close.<br>Resolution...

# Exceed 3D for Open GL visualization

I would like to use Exceed 3D on Windows, but the current version of Exceed 3D does not support the version of Exceed included with FiDAP.<br><br>Hummingbird is aware that the version...

# creating multiple point monitors

Client needs to define multiple point surfaces. At each point surface, create a monitor for u,v,w and p. Thus for x points, there will be 4x point monitors. Each monitor is written to a...

# An explanation of how the gravitational body force term is formulated in FLUENT

Questions have arisen from time to time about how FLUENT 6 treats the gravitational body force term. A derivation and explanation of this is provided in the pdf document (below).<br>A...