FLUENT V6 - Performance problems using 4 dual core Opteron processors: multiple parallel session using same processors / cores |
A 4-process parallel FLUENT session runs on a machine equipped with 4 dual-core opteron processors.<br>A second session of the same kind is launched: It uses the same 4 processor cores,... |
FLUENT 6 - how to model gas combustion using non-premixed model -- best practices |
Are there any modeling guidelines or best practices availalble for using the non-premixed model for gaseous combustion? This model is useful for simulating gas turbines, gas boilers/heaters,... |
FLUENT 6 - how to model bubble column reactors -- best practices |
Are there any guidelines or best practices available for modeling of bubble column reactors? These reactors are commonly used for Fischer-Tropsch synthesis, for example.<br>Yes, a best... |
FLUENT 6 - How to model scavenging in two-stroke engines -- best practices |
Are there any guidelines or best practices available for the simulation of scavenging in two-stroke engines? Scavenging is the operation by which exhaust gases are cleared from (and fresh mixture... |
FLUENT 6 - How to use the wet steam model -- best practices |
Are there any guidelines or best practices available that describe how to use the wet steam model? This model is used for steam turbines, nozzles and valves, and other processes involving... |
POLYMAT - Strange behaviour for the steady elongational (extension) viscosity of some viscoelastic models (Maxwell, White-Metzner, Oldroyd, Johnson-Segalman..) |
In POLYMAT, the steady elongational viscosity of some viscoelastic models may exhibit a strange behaviour. Typically, the steady curve shows a sudden increase, sometimes followed by a sudden... |
POLYFLOW - What draw ratio can be reached in fibre spinning ? What take-up velocity ? |
Let us consider a 3D fibre spinning situation, where the die has a rectangular cross section of 2x0.08 units. With a short fibre (short computational domain), is it possible to obtain a draw... |
POLYFLOW - On the meaning of the pressure (also negative pressure) for an incompressible fluid |
Simulations defined under carefully selected boundary conditions may still exhibit pressure values below the atmospheric one. What does this mean?<br>The pressure field can exhibit very... |
MixSim 2.1: Cannot run on Linux: error message in mixsim run script |
Trying to run MixSim 2.1 on SuSE Linux 10.1 (not a supported platform...):<br><br>mixsim: line 4514: unexpected EOF while looking for matching<br>mixsim: line 4570: syntax error:... |
POLYFLOW - fibre spinning and pulltrusion for a viscoelastic flow without symmetry |
The definition of a free surface flow with take-up velocity and one symmetry plane or less does not enable the constraint on global displacement. What can be done here ?<br>An easy... |
FLUENT 6.3 - Time averaged data at a fixed point in sliding mesh problem |
Fixed monitors are needed in cases when the probe position is fixed (e.g. thermocouple, pitot tube) in a domain with moving boundaries. Is it possible to obtain the time averaged values at fixed... |
FLUENT6 - freezing the values of selected flow variables in selected cell zones |
There are times when it is desirable to freeze the solution for one of the variables in one or more cell zones. FLUENT provides a method for fixing the values in a cell zone if constant values... |
Fieldview - Error: client initialization failed and unknown socket or communication error <10013>. |
While opening Fieldview on Windows the following error message appears:<br><br> client initialization failed and unknown socket or communication error... |
URGENT - compiling UDF on an Intel64-bit M/C |
A key client has an urgent Problem with the compiling of UDF in parallel (oder serial) on a Win64 Xenon M/C, WinXp.<br>He gets the following error when he tries to compile the UDF under... |
FLUENT V6 - Computing wall shear stress using a User-Defined Function |
Is it possible to calculate wall shear stress within a User-Defined Function (UDF)?<br>The UDF below (to be used with FLUENT 6.3.26) shows a strategy to compute and use wall shear stresses.... |
POLYFLOW - The components of tensors in film casting do not seem in agreement with the physics |
A film casting simulation is defined for a viscoelastic fluid model, where the take-up velocity is along y. The EVSS-SU method is used. Upon inspection of the results, it seems that the... |
Three or more phase VOF visualization |
<br>In VOF problems with more than 2 phases, there is no direct variable to visualize all the three phases simultaneously. Solution no. 1197 suggested the following custom field function,... |
POLYFLOW - What is the meaning of fieldnames such as S EVSS, D EVSS, D DEVSS, etc? |
When inspecting the results of a viscoelastic simulation, several fields appear, whose names are like S_EVSS, D_EVSS, D_DEVSS, etc. What is their meaning ?<br>When the EVSS technique is... |
POLYFLOW - transient viscoelastic calculation may fail at early steps, because of lack of precision |
Running a transient viscoelastic calculation from scratch (i.e. vanishing stress state) often fails. The most typical symptom is a reduction of the time step below the minimum value assigned. ... |
FLUENT 6 - Checkpointing multiple jobs in a job specific manner |
When there are two or more FLUENT sessions being run on the same machine by the same user, having check-fluent or exit-fluent files in /tmp or C:temp will checkpoint only one of the multiple jobs.... |
FLUENT 6 - Calculation of DPM Concentration |
How is the DPM concentration calculated in FLUENT?<br>The DPM concentration is defined as:<br><br> DPM concentration = (Avg. particle mass in cell * Part resi. Time * Strength... |
FLUENT 6 - UDF to count the number of droplets in a VOF simulation |
The VOF model is often used in the spray atomization application. In such applications, a lot of droplets will be produced in the simulation. Users often want to know the number of droplets and... |
FLUENT 6 - Solution to highly swirling flow problem - problem of over-predicting tangential velocity near the wall |
In high-swirl rotating turbulent flows, the default settings for the Reynolds Stress Model and wall function can lead to erroneous predictions of the velocity profiles near rotating walls such... |
POLYMAN - output of polyfuse is not known in POLYMAN |
Running a POLYFUSE session invoked from POLYMAN, within e.g. the mesh repository. The session runs well, and the output file is produced; it is visible when examined via a shell window. However,... |
FLUENT 6 - Species appear to diffuse across thin solid walls. |
Species appear to diffuse across a solid wall with zero thickness. In this specific case no reactions were occurring, there were only two species and the BC at the wall was zero-diffusive flux and... |