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-   -   Comparing spallart-allmaras, k-epsilon, k-omega models (http://www.cfd-online.com/Forums/main/86697-comparing-spallart-allmaras-k-epsilon-k-omega-models.html)

glex1308 March 30, 2011 14:45

Comparing spallart-allmaras, k-epsilon, k-omega models
 
Hi all,

I've performed several analyses of flow over a symmetrical wing profile using Star-ccm and used three different turbulent models (RANS: spallart-allamaras, k-epsilon and k-omega models). From the results all 3 give almost identical velocity vector plots but begin to differ for pressure and turbulent viscosity plots.
I was wondering if anyone can explain why the peak pressure at the front of the wing is higher for spallart-allmaras then for both k-epsilon and k-omega models?
The results for turbulent viscosity around the airfoil are also very different between k-epsilon and k-omega models. The turbulent viscosity values for the k-epsilon model change a lot from the surface of the wing to the domain boundary but the k-omega model there is an almost zero value surrounding the wing and then changes value. Wondering if anyone knows why the k-omega values close to the surface are all identical?

Thanks in advance


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