|May 20, 2009, 15:55||
Turbulence modeling for a flat plate
Join Date: Apr 2009
Posts: 78Rep Power: 9
I'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?
|Thread||Thread Starter||Forum||Replies||Last Post|
|Discussion: Reason of Turbulence!!||Wen Long||Main CFD Forum||3||May 15, 2009 09:52|
|May Focus Area: Turbulence Modeling||Jonas Larsson||CFD-Wiki||0||May 2, 2006 11:48|
|Seperated Flow and Turbulence modelling flat plate||Simon Mizzi||Main CFD Forum||1||December 16, 2003 02:26|
|Turbulence dead? well... can somebody help me with a flat plate meanwhile?||Javier||Main CFD Forum||2||May 23, 2000 04:41|