Fluent 6.1: How to do a visualization with time dependent particle release |
The mixing of two streams with different inflow velocity is to be evaluated qualitatively by means of pathlines. Fluent's Pathline animation however only allows to either display the entire... |
Fluent 6.1: Try this if your UDF has memory allocation problems |
The problem was discovered when client transferred a UDF that ran fine on AIX (Power 3 AIX 4.3.3) to IRIX (IRIX64 devirix 6.5 07121149 IP28). However the problem could occur on any platform and... |
FLUENT 6 - Slow convergence along centerline for polar grids (O-grids) |
It is known that FLUENT converges very slowly along the centerline of 3D polar grids. These types of grids are generated in some preprocessors such as GridGen and ICEM.<br><br>This... |
POLYFLOW - viscoelasticity and viscous heating |
What is the effect of viscoelasticity upon viscous heating?<br>In a shear flow, shear stress is the only stress component that contributes to viscous heating. In other words, having a... |
POLYFLOW - a "frozen" free surface with sub-models still moves. What can be done ? |
Some applications require the definition of a frozen free surface, by means of a sub-model (with vanishing velocities). This can be the case for the study of a fixed contact for non-conformal... |
Hex core mesh in Gambit 2.1: assign boundary condition for the fluid zone |
In Gambit 2.1, if one assigns boundary conditions for the fluid zone, which is meshed using hex core mesh, Gambit is unable to write the correct mesh file. You will get Null Domain Pointer error... |
Cavitation model with dynamic mesh doesn't converge!!! -- FLUENT-6.2 |
Cavitation model with dynamic mesh doesn't converge!!! The case carries pressure bcs.<br>It is often found that cavitation model is not converging. This is also found true when... |
automate post processing |
It is required many times to create a series of iso-surfaces, postprocess some variables<br>on these iso-surfaces and write the data into a file for further use.<br><br>Following... |
Error when separating Fluid zone |
When a fluid zone is separated using cells marked using a Boundary zone, Fluent reports following error:<br><br>Error: update_cell_references: not all faces on thread 10 share... |
How to create iso-surfaces that are a series of conical sections? |
<br>Sometimes it is helpful to create a series of circular iso-surfaces that are<br>sections of a cone, to represent the development of the flow field along<br>one... |
POLYFLOW - creation of shell mesh from a 2D geometry (blow moulding) |
When switching the starting and ending borders for thickness calculation, it does not necessarily imply that this choice will affect the selected line for shell generation<br>In the... |
POLYFLOW - ***WARNING*** from *frerem* Vanishing norm for direction vector |
As a consequence of this error message, the calculation usually stops.<br>A flow case with free surface may require the calculation of direction of motion for nodal displacements on the free... |
POLYMAT - curve display : points are not properly ordered |
A curve file created on a UNIX machine contains a sequence of points in a particular ordering. On a PC, this ordering is not reproduced on the graphic, e.g. in POLYMAT. When copying the curve... |
POLYFLOW - Empirical laws in rheology (Cox-Merz, Laun, Gleissle) |
For some materials, there exist rules that link properties. Such laws are often empirical, and have to be handled with care. In particular, there is no theoretical proof regarding their validity. ... |
UDF to compute the internal circulation in a bubble using VOF |
It is important to get the internal circulation inside a bubble in many cases. Here the observer is sitting at the bubble itself.<br>1) Get the converged solution<br>2) The define on... |
POLYFLOW - Single or double precision ? |
1. How do I know whether a calculation is performed in single or double precision?<br>2. How can I change this?<br>1. The listing file (long version) reports messages as follows... |
best practice for converging v2f turbulence model |
When the v2f turbulence model is turned on, sometimes it is difficult to get the solution converged. Sometimes the residuals of k and v do not decrease, even though other residuals decrease very... |
How to define mixture for species transport of air and water vapor |
A large number of applications exist for which users would like to calculate the relative humidity everywhere in the computational domain. To do this, it is necessary to solve species transport... |
Fluent6: Documentation: UDF Manual: Section 3.2: Add the fact that multi-dimensional arrays don't work! |
A UDF that contains and uses a multi-dimensional array ("real x[3][7]") can be read by the UDF interpreter without error message. However, executing it generates unpredictable bad... |
Loop Over cells through which a surface created for postprocessing passes |
It is sometimes necessary to retrieve the values of specific variables on a surface that was created for post processing using some other variable. This could be done by looping over cells with... |
POLYSTAT - points are not displayed when running through Exceed |
When running a POLYSTAT session under Exceed environment, points in slices defined for statistical analysis are not visible.<br><br>The trouble does not appear when running POLYSTAT on... |
POLYMAN - multiple entries for output files involving prefixes such as res, uns, etc. |
In POLYMAN, files whose prefix contains a character string usually attributed as suffixe, may have multiple entries in the file tree. For example, if the prefix of an output fieldview filename... |
POLYFLOW - Buffering on disk |
How to direct the buffering files in a given directory?<br>By default, the buffer files will be written in the directory where the simulation has been launched. Assigning a given directory... |
Fluent graphics: how to control font size, font style, color range skip value |
How to set a particular font style or size in the graphics windows?<br>How to reduce number of color range labels associated with contour plots?<br>As a general note, there is no... |
Fluent graphics: how to set font style and size, color range skip value |
How to set font style and font size for graphics?<br>How to control the number of labels printed next to the color range bar?<br>As a general note, there is no single global settting... |