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June 7, 2013, 16:46 |
rhoSimpleFoam pipe flow crashing
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#1 |
New Member
Sam
Join Date: Jun 2013
Posts: 3
Rep Power: 12 |
I have a simple pipe flow model that works fine in fluent but crashes OpenFOAM. The model is attached.
Here are the commands to run the case in OpenFoam 2.1.1: blockMesh surfaceFeatureExtract -includedAngle 150 ./constant/triSurface/surface.stl surface.eMesh snappyHexMesh -overwrite transformPoints -scale "(.001 .001 .001)" renumberMesh -overwrite rhoSimpleFoam The model runs to about 200 iterations, crashes and the output fields are clearly not headed in the right direction. I've tried the following: - first order - potentialFoam - a variety of setting changes suggested on the forums Any help would be appreciated. Thanks, Sam |
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June 8, 2013, 18:43 |
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#2 |
Member
VS
Join Date: Nov 2012
Posts: 86
Rep Power: 13 |
Sam,
i've checked only your controlDict file, because i had the same problem when i used rhoSimpleFoam. First of all, i suggest you lower your timestep, even put a constrain of max Courant 0.5 or 1. I strongly believe this could fix your problem, since your BCs are sufficient. I wait for your results. |
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June 19, 2013, 11:16 |
Solved
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#3 |
New Member
Sam
Join Date: Jun 2013
Posts: 3
Rep Power: 12 |
I reduced the rho relaxation factor to 0.05 and ran the model in 2.2. The results now look correct.
-Sam |
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July 1, 2013, 16:37 |
Incorrect transport properties for air
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#4 |
New Member
Sam
Join Date: Jun 2013
Posts: 3
Rep Power: 12 |
The transport properties should have been:
transport { As 1.458e-06; // C1 Coefficient Ts 110.4; // C2 Coefficient } That change plus the relaxation change brings the result within 30% of the fluent and test results. This is still not close enough in my opinion... I have attched a new version of the analysis. Again the commands to reproduce are: blockMesh surfaceFeatureExtract -includedAngle 150 ./constant/triSurface/surface.stl surface.eMesh snappyHexMesh -overwrite transformPoints -scale "(.001 .001 .001)" renumberMesh -overwrite rhoSimpleFoam |
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