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RNG K-epsilon turbulence model

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Old   June 6, 2007, 19:33
Default RNG K-epsilon turbulence model
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Hello I'm quite new in CFD

I'm reading about turbulence models and y+...

What does RNG mean?

I know that the difference between K-epsilon and RNG k-epsilon models are the constants in the transport equations but what is the purpose to change these variables and when we used each model?

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Old   June 7, 2007, 04:51
Default Re: RNG K-epsilon turbulence model
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The RNG k-epsilon turbulence model is supposed to perform better than the standard k-epsilon model in all cases. Not only the constants in the transport equations change, but also there is an addition of a term in the source term of the epsilon equation.
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Old   June 7, 2007, 09:49
Default Re: RNG K-epsilon turbulence model
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The RNG k-e equations have been tuned based on theory of a turbulent flow (RNG means ReNormalization Group) while the standard k-e is empirically tuned on simple flows (shear, jet, grid turbulence...).

The RNG model then emphasizes the mathematical consistence but it has the same conceptual drawbacks as any k-e model: the results are not so good when there is a sensitive anisotropy of the turublent flow.
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