- **FLUENT**
(*https://www.cfd-online.com/Forums/fluent/*)

- - **Turbulence modeling for a flat plate**
(*https://www.cfd-online.com/Forums/fluent/64709-turbulence-modeling-flat-plate.html*)

Turbulence modeling for a flat plateI'm doing a validation study for a user-defined v2-f turbulence model in FLUENT. I used the empirical laminar flow equation for skin friction: 0.664/sqrt(Re_x) to compare results for several turbulence models. y+ is around 1.
I'm finding that Spalart-Allmaras, k-epsilon, realizable k-epsilon, k-epsilon RNG, k-omega, and k-omega SST all overpredict the skin friction coefficient by 20-50%. Interestingly enough, the v2-f models predict nearly identical skin friction coefficient distributions as the empirical equation. I have a 2 questions: 1. Why do the standard models over predict Cf for such a simple flow? 2. Is this typical for these models? |

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