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May 9, 2012, 11:01 |
kOmegaSST OF2.1 Help needed!
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#1 |
Member
wided
Join Date: Jul 2010
Posts: 54
Rep Power: 16 |
Hi all,
I am trying to get a case of a flow over an airfoil to work using the turbulence model kOmegaSST. I have a mesh where yPlus is around 30. As it is stated in many papers and books this value shoulb be OK if one wants to use a wall function. I also read that the kOmegaSST in openFoam uses a wall function "by default" and one can not avoid using it (any comments on that?). My parameters are attached to this thread, I donīt understand what I have done wrong, but when the Re number is 20.000 the case is working, but it will diverge when Re=700.000. Any help on this will be greatly appreciated as I am really lost with all what is written about kOmegaSST, as it seems that there are "many ways" to use it in OpenFoam. I would like that this exchange space will serve to discuss that issue about kOmegaSST. k: Code:
internalField uniform 0.06; boundaryField { inflow { type fixedValue; value uniform 0.06; } outflow { type zeroGradient; internalField uniform 0.06; boundaryField { inflow { type fixedValue; value uniform 0.06; } outflow { type zeroGradient; Code:
internalField uniform 0.00813; boundaryField { inflow { type fixedValue; value uniform 0.00813; } outflow { type zeroGradient; } airfoil { type omegaWallFunction; Cmu 0.09; kappa 0.41; E 9.8; beta1 0.075; value uniform 0.00813; } frontAndBack { type empty; } } Code:
internalField uniform 0; boundaryField { inflow { type calculated; value uniform 0; } outflow { type calculated; value uniform 0; } airfoil { type nutWallFunction; Cmu 0.09; kappa 0.41; E 9.8; value uniform 0; } frontAndBack { type empty; } } |
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