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-   -   incorrect to use nuTilda wall functions for k-epsilon? (http://www.cfd-online.com/Forums/openfoam-pre-processing/95343-incorrect-use-nutilda-wall-functions-k-epsilon.html)

newToOpenFoam December 14, 2011 06:15

incorrect to use nut wall functions for k-epsilon?
 
Hello,

Is nut used only by Spalart Allmaras turbulence model or can it be specified in wall functions for other models as well?

I tried to run k-omega SST turbulence model with the following wall functions specified on the walls:

omega { type omegaWallFunction; value uniform 1; }
nut { type nutSpalartAllmarasWallFunction; value uniform 1; }

Specifying k instead gives similar results:

omega { type omegaWallFunction; value uniform 1; }
k {type kqRWallFunction; value uniform 0.75;}


When I use realizable k-epsilon I get very different results depending on wheather k or nut is specified by the wall.
Is it correct to use wall functions for nut for k-omega SST, but incorrect for K-epsilon models?

Regards


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