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kOmegaSST OF2.1 Help needed!

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Old   May 9, 2012, 10:01
Unhappy kOmegaSST OF2.1 Help needed!
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wided
Join Date: Jul 2010
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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;
omega:
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;
    }
}
nut
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;
    }
}
I also attached some pics of the mesh I am using.
Attached Images
File Type: jpg fig1.jpg (96.6 KB, 26 views)
File Type: jpg fig2.jpg (93.3 KB, 20 views)
File Type: jpg fig3.jpg (57.2 KB, 22 views)
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