FLUENT 6.2 - tip to avoid large jumps in residuals when restarting a calculation with grid interfaces from saved data |
While restarting a parallel calculation that involves grid interfaces after reading a saved data file, the residuals may jump up significantly and even cause the calculation to diverge in FLUENT... |
FLUENT 6 - Utility to compute the time averaged solution from multiple data files saved at regular intervals |
Suppose an unsteady calculation has been run for several timesteps and we have saved the data files at regular intervals. Now we may at times need to find the "average solution" for... |
POLYFLOW - The calculation is aborted with the message "Number of coefficients exceeded !". |
When running a large simulation case, or a case involving a lot of constraints (boundary conditions, etc.), POLYFLOW may be aborted before the first iteration, with the error message... |
FloWizard - FloWizard runs very slowly on laptops using wireless or bluetooth connections |
FloWizard runs very slowly on laptops which have wireless or bluetooth connections. By default, Windows XP prefers wireless or bluetooth networks over the ethernet Local Area Network. This may... |
WINDOWS - XIO: fatal IO error 10054 (Winsock Error) on X server |
Problem:<br><br>When trying to launch Gambit 2.2.30, Exceed 9.0 starts up but gives the following error and Gambit fails to launch.<br><br>XIO: fatal IO error 10054... |
POLYDATA - constraint on global displacement cannot be applied. |
A free surface case is generated (2D or 3D) with remeshing. However, POLYDATA refuses to enable a constraint on global displacement. Actually POLYDATA sends the warning: "Constraint on... |
POLYFLOW - free jet with surface tension and contact angle: geometric jump at the exit of the domain |
A 2D flow case involves free surface and surface tension, where contact angle is imposed at the exit of the computational domain as well as a draw-down (take up) velocity. The solution exhibits a... |
GAMBIT - Journal commands to determine the edges for periodic face linking given face and vertex labels |
While linking faces to make them periodic, a vertex from each face is to be chosen for linking. In interactive mode, when you select the face and edge with the mouse, Gambit internally determines... |
POLYDATA - trouble with fonts on Linux AMD64 platforms (chaotic menus) |
When running POLYDATA on a AMD64 Linux machine, the fonts display may become chaotic. This probably appears when the environment variable LD_LIBRARY_PATH has been modified by a user.<br>A... |
FLUENT 6 - Body Force Weighted discretization for Pressure recommended with the Non Iterative Time Advancement (NITA) scheme for VOF free surface calculations |
When the VOF free surface model is used, the PRESTO discretization scheme for Pressure does not work well in combination with the Non Iterative Time Advancement (NITA)... |
POLYFLOW - Default (or recommended) filenames and extensions |
What are the default filenames and extensions in POLYFLOW?<br>What file is behind a given filename extension?<br>dbs - GAMBIT file containing the geometry and mesh<br>jou -... |
FLUENT 6 - Improving convergence of calculations involving porous media with high resistance in the flow direction |
In calculations that involve porous media with high resistance in the flow direction, a good initial guess for pressure upstream may be necessary to ensure mass balance and good convergence. But... |
POLYFLOW - What value could be assigned to a heat transfer coefficient along a boundary? |
Non-isothermal simulations require imposing boundary conditions for the energy equation. Imposed temperatures as well as vanishing fluxes are easy to set. Sometimes however, a heat transfer... |
POLYDATA - Disabling the actual geometric (Eulerian) mould motion for contact with velocity |
When assigning a mould motion in POLYDATA, the mould domain moves accordingly in time. Some simulation cases involving a contact with a solid body, whose domain should preferably not move in the... |
POLYFLOW - Severe inaccuracies of the velocity field for flow cases involving periodic boundary conditions |
Some simulation cases involving periodic boundary conditions, exhibit somewhat severe inaccuracies in the velocity field. A careful inspection of the geometry has revealed that the trouble may... |
FLUENT 6 - Specifying a desired number of streams in a surface injection with the Discrete Phase Model that is different from the number of cell faces on the inlet surface |
The domain in question has an inlet surface which is a wide opening with an arbitrary shape (not a regular rectangular surface). This surface has a large number of cell faces and is to be used as... |
GAMBIT - Exporting ACIS geometry from Solidworks for import into GAMBIT |
The correct version of the ACIS kernel must be used when exporting geometry from Solidworks (or other CAD packages) to GAMBIT.<br><br>In Solidworks, the ACIS kernel may be selected by... |
FLUENT 6 - How to annotate your graphical plots without using the GUI (useful for batch runs) |
<br>Annotating your graphical plots is a manual operation through the GUI. However, if you are running a calculation in batch mode and are saving graphical plots during the run, you may need... |
GAMBIT - Right mouse button not working on Windows platform |
Within Gambit, the right mouse button does not work in the icons window, but does work in the graphics window. This problem only occurs when running on Windows via Exceed.<br>This... |
FLUENT 6 - User Defined Function to compute the integral of a variable along a line |
Line surfaces in FLUENT have area in 2d and 2d-axi but not in 3d, so currently integrals on line surfaces are zero.<br><br>This solution provides a sample User Defined Function (UDF)... |
FLUENT 6 - Tips for predicting vortex shedding with high Mach number and high Reynolds number flows in 3D |
Flow domains that contain constrictions such as orifice plates may produce high Reynolds number and high Mach number flows with votex shedding. This solution provides solution strategy tips for... |
GAMBIT - exporting geometry in IGES or STEP format on the Windows platform does not produce an output file |
On the Windows platform, exporting geometry from GAMBIT in IGES or STEP format failed to produce an output file. In the transcript window, GAMBIT prints messages indicating that entities were... |
GAMBIT - How do I convert my GAMBIT journal file to work in a newer GAMBIT release |
My journal file does not work in the current release of GAMBIT. How do I migrate my existing journal file to this release?<br>Entities are typically identified by their name, but may also... |
FLUENT 6.2 - evaluation of choice of repartition interval in parallel with dynamic mesh |
The evaluation of the flag in the parallel partition panel for automatic repartitioning (on-off) with dynamic mesh activated is only done when remeshing is enabled. Thus it is not possible to... |
POLYFLOW - How to prevent deformation of a solid slipping wall adjacent to moving domain with remeshing? |
A 3D extrusion case is defined where a solid wall is adjacent (a boundary) to the moving domain. Although this solid wall is not part of the free surface, it may deform throughout the... |