difference between incompressible kepsilon model and compressible kepsilon model
Hi, does anybody know the difference between incompressible kepsilon model and compressible kepsilon model in OpenFOAM? I found that the compressible model has more model constants. For example, the model constants for the incompressible RNG kepsilon 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 kepsilon 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? 
Information concerning Turbulence Models
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 RNGkEpsilon model, as it might be useful for one of my simulations. It might be implemented correctly, but I am not sure yet. For RNGkEpsilon, 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 
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Hi
Do you find any relative papers about the compressible kepsilon model? I can not find a clue where the C3 term come from. 
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