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Old   June 7, 2013, 15:46
Default rhoSimpleFoam pipe flow crashing
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Sam
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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
Attached Files
File Type: zip pipe.zip (17.6 KB, 18 views)
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Old   June 8, 2013, 17:43
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VS
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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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Old   June 19, 2013, 10:16
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Sam
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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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Old   July 1, 2013, 15:37
Default Incorrect transport properties for air
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Sam
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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
Attached Files
File Type: zip pipe_new.zip (17.6 KB, 11 views)
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