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

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surfaceScalarField muf = twoPhaseProperties.muf();
fvVectorMatrix UEqn
(
fvm::ddt(rho, U)
+ fvm::div(rhoPhi, U)
- fvm::laplacian(muf, U)
//- (fvc::grad(U) & fvc::grad(muf))
- fvc::div(muf*(mesh.Sf() & fvc::interpolate(fvc::grad(U)().T())))
);
if (momentumPredictor)
{
solve
(
UEqn
==
-fvc::reconstruct
(
mesh.magSf()*(fvc::snGrad(pd) + ghf*fvc::snGrad(rho))
)
);
}