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

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surfaceScalarField muf = mixture.muf();
fvVectorMatrix UEqn
(
fvm::ddt(rho, U)
+ fvm::div(mixture.rhoPhi(), U)
- fvm::laplacian(muf, U)
- (fvc::grad(U) & fvc::grad(muf))
//- fvc::div(muf*(mesh.Sf() & fvc::interpolate(fvc::grad(U)().T())))
);