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July 22, 2009, 16:55 |
couplingFactor in LRR turbulence model
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New Member
Nat Trask
Join Date: Mar 2009
Location: Providence, RI
Posts: 18
Rep Power: 17 |
Can anyone shed some light on what exactly the couplingFactor parameter is doing in the divDevRhoReff function of the LRR turbulence model?
tmp<fvVectorMatrix> highDensityRSTM::divDevRhoReff(volVectorField& U) const { if (couplingFactor_.value() > 0.0) { return ( fvc::div(rho_*R_ + couplingFactor_*mut_*fvc::grad(U)) + fvc::laplacian((1.0 - couplingFactor_)*mut_, U) - fvm::laplacian(muEff(), U) - fvc::div(mu()*dev2(fvc::grad(U)().T())) ); } else { return ( fvc::div(rho_*R_) + fvc::laplacian(mut_, U) - fvm::laplacian(muEff(), U) - fvc::div(mu()*dev2(fvc::grad(U)().T())) ); } } It is unclear to me what the advantage is in splitting fvc::laplacian(mut_, U) up into fvc::div(couplingFactor_*mut_*fvc::grad(U)) + fvc::laplacian((1.0 - couplingFactor_)*mut_, U) -Nat |
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