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foam-extend4.1-coherent-io/applications/solvers/multiphase/lesCavitatingFoam/UEqn.H

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surfaceScalarField muEff
(
"muEff",
twoPhaseProperties.muf()
+ fvc::interpolate(rho*turbulence->nuSgs())
);
fvVectorMatrix UEqn
(
fvm::ddt(rho, U)
+ fvm::div(phi, U)
- fvm::laplacian(muEff, U)
//- (fvc::grad(U) & fvc::grad(muf))
- fvc::div(muEff*(fvc::interpolate(dev(fvc::grad(U))) & mesh.Sf()))
);
if (momentumPredictor)
{
solve(UEqn == -fvc::grad(p));
}