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SAS / RANS - Omega convergence

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Old   September 17, 2013, 09:35
Default SAS / RANS - Omega convergence
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Hi all,

I run some pipe flow with bluff body case using the k-omega-sst SAS model (OpenFoam). I tryed many different numerical setups, but I can't get convergence for omega. (simulation was restarted, so all other residuals are already flat...)
picture_1.jpeg
Now, running the same numerics, boundary conditions, time steps,... with the regular RANS k-omega-sst model works:
picture_2.jpeg

Can anyone explain this? Or give me some ideas how to get convergence?
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Old   September 23, 2013, 02:03
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If you encounter the same problem: I found a possible bug. The report can be found here:
http://www.openfoam.org/mantisbt/view.php?id=1023

My omega boundary condition "omegaWallFunction" is accepted by openfoam (no error message), but it looks like the code doesn't use it at all.
Using a different b.c. for omega gives convergence, also for the SAS model.
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