Hi,
I have a pipe looking l
Hi,
I have a pipe looking like this: http://www.cfd-online.com/OpenFOAM_D...es/1/10355.jpg and its extruded along the flow direction (z-axis). When I run simpleFoam (3000 Steps) I get unrealistic values for k(at least 184 though u = 3.725 m/s). Also near the boundaries they look strange. k should go back to 0 and epsilon should rise constantly. http://www.cfd-online.com/OpenFOAM_D...es/1/10351.png http://www.cfd-online.com/OpenFOAM_D...es/1/10352.png I made a simpler case with a 2D channel and a similar mesh. Here the results look quite good. http://www.cfd-online.com/OpenFOAM_D...es/1/10353.png http://www.cfd-online.com/OpenFOAM_D...es/1/10354.png Any idea what i am doing wrong? B.c.s for k and epsilon are zeroGradient (similar to the tutorial cases in simpleFoam / turbFoam) and just for the internal field I gave values. I also tried values on inlet but then I get an error message saying I need zeroGradient at inlet patch. Thanks for your help Henning |
what turbulence model do you u
what turbulence model do you use?
Have you had a look at boundaryFoam and its tutorial? Even channelOodles. That might help. Pierre |
Why don't you try a different
Why don't you try a different mesh configuration, check O-Grid configuration, that might help.
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I am using the classical k-eps
I am using the classical k-epsilon model.
I took a look on boundaryFoam. It uses zeroGradient b.c. for both, k and epsilon as well. channelOodles didn't help me that much since it is LES and i am not so familar with LES. And changing the mesh ... well, I don't like to use O-Grid for this solution since I would prefer a mesh that can be made finer at the boundaries easyly. Maybe any other ideas? Anyhow, thank you very very much for your help so far. Henning |
Well, found my problem. Did pa
Well, found my problem. Did patch instead of wall in blockMeshDict. It's always the simple things that make life so interesting ;)
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