Standard-k-€ vs. low-Re-k-€
I have a question about the difference in the calculation of the two different turbulence models Standard-k-€ (high-Re) and a low-Re model such as LaunderSharmak€.
I think I have read that the high-Re model is proned to calculate turbulent eddies bigger than they are in reality. Alleged due to great values of viscosity.
Because of that it is allegedly better to use a low-Re model such as LaunderSharmak€ to avoid this problem.
I'm not sure if this is right, so if anyone knows something more about that please let me know.
low-Re models are used in wall bounded flows with resolved boundary layer since turbulent fluctuations and therefore the turbulent viscosity (leads to a low Reynolds number) are damped near walls. So when to use a low-Re model depends on your case. Different turbulence models normally have different scopes and it is your job to find the right one for your case ;)
you can find some details in the Fröhlich BookLarge Eddy Simulation turbulenter Strömungen p. 52
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