[yhy20081016]

Hi, does anybody know the difference between incompressible k-epsilon model and compressible k-epsilon model in OpenFOAM? I found that the compressible model has more model constants. For example, the model constants for the incompressible RNG k-epsilon model are
RNGkEpsilonCoeffs
{
Cmu 0.0845;
C1 1.42;
C2 1.68;
sigmak 0.71942;
sigmaEps 0.71942;
eta0 4.38;
beta 0.012;
}
howerer, the model constants for the compressible RNG k-epsilon model are
RNGkEpsilonCoeffs
{
Cmu 0.0845;
C1 1.42;
C2 1.68;
C3 -0.33; // only for compressible
Prt 1.0; // only for compressible
sigmak 0.71942;
sigmaEps 0.71942;
eta0 4.38;
beta 0.012;
}
By the way, where can I find some references about the details of turbulence models in OpenFOAM?

[Linse]

Dear Yehanyu,

Although probably you found some answers already, for the matter of completeness:
Concerning turbulence models within OpenFOAM I strongly suggest to read the original publications. It seems OpenFOAM is dearly missing the documentation about these.
Moreover I suggest to check if the models are correctly implemented. In particular I am reviewing the implementation of the RNG-k-Epsilon model, as it might be useful for one of my simulations. It might be implemented correctly, but I am not sure yet.

For RNG-k-Epsilon, the original paper seems to be
Yakhot, Orszag, Thangam et al.: Development of turbulence models for shear flows by a double expansion technique; Physics of Fluids A, 4, 1510 (1992)

Cheers,
Bernhard

[yhy20081016]

Originally Posted by Linse

Dear Yehanyu,

Although probably you found some answers already, for the matter of completeness:
Concerning turbulence models within OpenFOAM I strongly suggest to read the original publications. It seems OpenFOAM is dearly missing the documentation about these.
Moreover I suggest to check if the models are correctly implemented. In particular I am reviewing the implementation of the RNG-k-Epsilon model, as it might be useful for one of my simulations. It might be implemented correctly, but I am not sure yet.

For RNG-k-Epsilon, the original paper seems to be
Yakhot, Orszag, Thangam et al.: Development of turbulence models for shear flows by a double expansion technique; Physics of Fluids A, 4, 1510 (1992)

Cheers,
Bernhard

Thank you very much.

[JasonWang3]

Hi

Do you find any relative papers about the compressible k-epsilon model? I can not find a clue where the C3 term come from.