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-   -   Don't know entries in fvScheme: div(phi,nuTilda) and div((nuEff*dev(grad(U).T()))) (http://www.cfd-online.com/Forums/openfoam/81395-dont-know-entries-fvscheme-div-phi-nutilda-div-nueff-dev-grad-u-t.html)

idrama October 26, 2010 05:41

Don't know entries in fvScheme: div(phi,nuTilda) and div((nuEff*dev(grad(U).T())))
 
Hello Foamers!

in my fvScheme file there are two entries which I do not know for what they stand for:

divSchemes
{
...

div(phi,nuTilda) Gauss upwind;
div((nuEff*dev(grad(U).T()))) Gauss linear;

}

Does anybody know for what equation they are?

Cheers in advance!

vkrastev October 27, 2010 12:19

Quote:

Originally Posted by idrama (Post 280754)
Hello Foamers!

in my fvScheme file there are two entries which I do not know for what they stand for:

divSchemes
{
...

div(phi,nuTilda) Gauss upwind;
div((nuEff*dev(grad(U).T()))) Gauss linear;

}

Does anybody know for what equation they are?

Cheers in advance!

The first one is the entry for the convection term in the transport equation of nuTilda, which is a quantity employed in the Spalart-Almaras turbulence model (so if you are using, for instance, a k-epsilon model, that line is useless).
The second one is the entry for the divergence scheme that will be used in the calculation of the explicit part of the source term for the Reynolds-averaged momentum equation. For more information about it, see the source files of any of the canonical RANS turbulence models (for instance the standard k-e).

Regards

V.


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