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April 26, 2018, 03:48
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Residuals not dropping in simpleFOAM.
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#1 |
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New Member
Manideep Reddy
Join Date: Aug 2017
Posts: 7
Rep Power: 9  |
Dear Foamers,
I am trying to simulate external flow over a geometry of an airship using simpleFoam solver and found that the residuals are not dropping at all after few iterations. So, I stopped the solver to see the pressure field. I found that the flow is not symmetric and pressure drag is more than five time that expected. Can anyone please explain why is this happening..? Is this because I am using steady state solver for flows with unsteady phenomenon involved or other reason. Thanks in advance.   TThanks in advance. |
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April 26, 2018, 04:09
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#2 |
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Senior Member
Uwe Pilz
Join Date: Feb 2017
Location: Leipzig, Germany
Posts: 744
Rep Power: 15 |
Depending on your Re number you may get an oscillatory solution. I recommend to use a transient solver like pimple- or pisoFoam. You see more directly where the problems of your models are.
__________________
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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