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November 29, 2010, 11:48 |
Slow very localized divergence
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#1 |
Senior Member
Join Date: Mar 2009
Location: Austin, TX
Posts: 160
Rep Power: 18 |
I am running an external aero case with simpleFoam and kOmegaSST (although my problem seems to be unrelated to the turbulence model, I see the same behavior if I disable turbulence). The solution looks very good... I am getting the same drag coefficient that I got in Star-CCM+ with a similar mesh and settings.
However, there are always a few cells, like on the order of 2-10, that will slowly get more absurd velocity and pressure values. I am having to stop the run every 50 or so iterations to delete these cells to avoid a FPE. Every time I delete the cells and restart, a whole new set of cells will start behaving similarly and I have to repeat the process. I have tried slightly different mesh densities on this geometry and I get the same behavior. All highly skewed cells are deleted before I even begin the run. I have switched to very conservative convergence criteria and enabled cell limiting. This is about the forth geometry I have run with similar settings, but the first to have this problem. Is this a common problem to run into with OpenFOAM? If not, any advice on how to proceed would be great. |
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Tags |
divergence |
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