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low reynolds number turbulence model in FLUENT

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Old   March 1, 2014, 07:21
Default low reynolds number turbulence model in FLUENT
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shubham jain
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i have done analysis on naca0012 with Re=3e6 using k-e RNG.

But i want to know best turbulence model for low reynold number analysis (well below critical reynolds number).

should i use spalart allmaras or some other model??

and upto which reynolds number should i use k-e RNG and then shift to Low Re model??
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Old   March 1, 2014, 07:49
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Quote:
Originally Posted by shubham jain View Post
i have done analysis on naca0012 with Re=3e6 using k-e RNG.

But i want to know best turbulence model for low reynold number analysis (well below critical reynolds number).

should i use spalart allmaras or some other model??

and upto which reynolds number should i use k-e RNG and then shift to Low Re model??
Low Reynolds number turbulence models should not be confused with low reynolds number flows.

Low reynolds number turbulence models are intended to resolve the viscous sub layer which is also present at high reynolds number. See description of boundary layer in Frank M white's book

If you are concerned with the laminar-turbulent mix flow then you should consider the transition models like SST gamma theta or K-Kl-Kw model.

SST, K-omega and SA model are by default low-reynolds-number turbulence models. K-epsilon models are added with damping functions to predict the laminar sublayer.
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