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- - **Addition of Rotation correction to SA Turbulence Model**
(*http://www.cfd-online.com/Forums/openfoam-programming-development/101527-addition-rotation-correction-sa-turbulence-model.html*)

Addition of Rotation correction to SA Turbulence ModelGuys,
I am trying to simulate wing tip vortices by modified the existing SA model by adding a rotational correction to it. This was proposed by Dacles and Mariani. It is the SA-R model in the following. http://turbmodels.larc.nasa.gov/spalart.html According to the above link, the only major difference is the way in which S_tilda is calculated. Finally, S_tilda will have to look like S_tilda=Omega+Crot*min(0,S-Omega)+nu_tilda*fv2/(k*d)^2 I tried to code this into openfoam the following way. const volScalarField omega(::sqrt(2.0)*(mag(skew(fvc::grad(U_))))); const volScalarField S(::sqrt(2.0)*(mag(symm(fvc::grad(U_))))); const volScalarField Stilda ( omega + scalar(2) * min(omega-omega,S-omega) + fv2(chi, fv1)*nuTilda_/sqr(kappa_*d_) ); The only reason I have omega-omega is so that I don't have to define 0 as a dimentionedScalar. can someone tell me if I am doing this right. I've tested this version and the results seem to be wrong. The results are right with the actual ( unmodified )implementation of SA model . Kalyan |

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