CFD Online Discussion Forums

CFD Online Discussion Forums (http://www.cfd-online.com/Forums/)
-   OpenFOAM (http://www.cfd-online.com/Forums/openfoam/)
-   -   nutSpalartAllmaras(Standard)WallFunction implementations (http://www.cfd-online.com/Forums/openfoam/96139-nutspalartallmaras-standard-wallfunction-implementations.html)

Arnoldinho January 13, 2012 09:07

nutSpalartAllmaras(Standard)WallFunction implementations
 
Hi all,

I cannot get really familiar with the implementations of the Spalart Allmaras model for nut, which can be, as read from many posts, be seen as a continuous wall function for nut.

Basically, there are two versions available:
- nutSpalartAllmarasWallFunction
- nutSpalartAllmarasStandardWallFuntion

As far as I can see, they differ in the way U as the controlling variable is calculated; the latter version with a differentiation of yPlus/yPlusLam and the first one with a more complex calculation of Utau.

Can anyone explain the actual difference and the applications they have been thought for, esp. regarding continuous low- to high-re modeling?

Arne

bastil January 16, 2012 04:53

Quote:

Originally Posted by Arnoldinho (Post 339177)
Can anyone explain the actual difference and the applications they have been thought for, esp. regarding continuous low- to high-re modeling?

Arne, as far as I know the first one (nutSpalartAllmarasWallFunction) is designed to be the continuous low- to high-re wall funtion whereas the second one (nutSpalartAllmarasStandardWallFunction) is a Hi-Re formulation. Please correct me if I'm wrong.

Regards Bastian

Arnoldinho January 17, 2012 02:34

Hi Bastil,

thanks for your answer. Unfortunately I cannot correct you in what you stated ;). I always used nutSpalartAllmaras (without 'standard') so I haven't yet checked the differences in results.

Arne


All times are GMT -4. The time now is 11:27.