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-   -   fv3 term in Spalart Allmaras model (http://www.cfd-online.com/Forums/openfoam-programming-development/92973-fv3-term-spalart-allmaras-model.html)

bfa September 30, 2011 06:57

fv3 term in Spalart Allmaras model
 
Hello,
could anyone please explain to me what the fv3 term in the Spalart-Allmaras turbulence model does? I can't find any paper that suggests such a term, apart from this page http://turbmodels.larc.nasa.gov/spalart.html. There they say the term shouldn't be used, as it leads to "unusual transition behavior at low Reynolds numbers". The OpenFOAM realisation of this additional term is slightly different from the version proposed there:

Code:

   
    volScalarField chiByCv2 = (1/Cv2_)*chi;

    return
        (scalar(1) + chi*fv1)
      *(1/Cv2_)
      *(3*(scalar(1) + chiByCv2) + sqr(chiByCv2))
      /pow3(scalar(1) + chiByCv2);

Does anyone know, what it's for or could anyone point me to a paper that justifies it's existence?

cheers,
bjoern

bgraves July 16, 2013 13:02

Hi,

I was wondering if you ever found the answer to your question?

-Ben


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