https://github.com/OpenFOAM/OpenFOAM-6/blob/master/src/TurbulenceModels/turbulenceModels/linearViscousStress/linearViscousStress.C 这里面计算的散度
template<class BasicTurbulenceModel> Foam::tmp<Foam::fvVectorMatrix> Foam::linearViscousStress<BasicTurbulenceModel>::divDevRhoReff ( volVectorField& U ) const { return ( - fvc::div((this->alpha_*this->rho_*this->nuEff())*dev2(T(fvc::grad(U)))) - fvm::laplacian(this->alpha_*this->rho_*this->nuEff(), U) ); }OpenFOAM
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