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strange residual of k when using realizable k-epsilon model |
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May 12, 2017, 11:43 |
strange residual of k when using realizable k-epsilon model
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#1 |
Senior Member
Yuehan
Join Date: Nov 2012
Posts: 142
Rep Power: 13 |
Hi Foamers,
I am using the realizable k-epsilon model. I run the k-epsilon model from the solution of the standard k-epsilon model. The solver is buoyantSimpleFoam. However, after dozens of iterations, the residual for k drops dramatically to 1E-12. The solver also bounds k. The minimum k is 3E-16 and maximum k is 0.2. There should be something wrong, but I have no idea where the problem is. I appreciate help from you. |
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May 12, 2017, 11:58 |
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#2 |
Senior Member
Uwe Pilz
Join Date: Feb 2017
Location: Leipzig, Germany
Posts: 744
Rep Power: 15 |
Depending on your geometry, this may be correct. k represents the kinetic turbulent energy. If you have a undisturbed free stream in most of your area, there is no turbulent energy.
__________________
Uwe Pilz -- Die der Hauptbewegung überlagerte Schwankungsbewegung ist in ihren Einzelheiten so hoffnungslos kompliziert, daß ihre theoretische Berechnung aussichtslos erscheint. (Hermann Schlichting, 1950) |
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May 12, 2017, 12:29 |
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#3 | |
Senior Member
Yuehan
Join Date: Nov 2012
Posts: 142
Rep Power: 13 |
Quote:
Thank you for your reply. The realizable k-epsilon is run from the solution of standard k-epsilon model, where the residual for k is around 1E-6. I don't know why there is such a big difference. |
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