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how to add a damping in the momentum equation |
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November 24, 2014, 00:34 |
how to add a damping in the momentum equation
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Htq
Join Date: Sep 2014
Posts: 3
Rep Power: 11 |
Recently, I'm using the groovyBC to make wave with the interFoam solver,so it must build a field as the relaxationZone,and I choose to add a damping in the momentum equation,the special attention is that I use the RAS turbulence model,I have looked some papers about it,but all the papers are in Laminar flow model,so I must solve the question.the momentum equation with damping which compiled by myself as follow:
fvVectorMatrix UEqn ( fvm::ddt(rho, U) + fvm::div(rhoPhi, U) + turbulence->divDevRhoReff(rho, U) - fvm::laplacian(muf,U) -(fvc::grad(U)&fvc::grad(muf)) +U*rho*thetaField ); and the part "- fvm::laplacian(muf,U) -(fvc::grad(U)&fvc::grad(muf)) +U*rho*thetaField" is added by me,Among them,the part "+U*rho*thetaField" is the damping,but I don't know the parts "- fvm::laplacian(muf,U) -(fvc::grad(U)&fvc::grad(muf))" and " + turbulence->divDevRhoReff(rho, U)"have question,because in the Laminar flow model paper,only have the part "- fvm::laplacian(muf,U) -(fvc::grad(U)&fvc::grad(muf))",so I want somebody give me a guide. |
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