applications/solvers/multiphase/twoLiquidMixingFoam/UEqn.H

   1     surfaceScalarField muEff
   2     (
   3         "muEff",
   4         twoPhaseProperties.muf()
   5       + fvc::interpolate(rho*turbulence->nut())
   6     );
   7
   8     fvVectorMatrix UEqn
   9     (
  10         fvm::ddt(rho, U)
  11       + fvm::div(rhoPhi, U)
  12       - fvm::laplacian(muEff, U)
  13       - (fvc::grad(U) & fvc::grad(muEff))
  14     //- fvc::div(muEff*(fvc::interpolate(dev(fvc::grad(U))) & mesh.Sf()))
  15     );
  16
  17     UEqn.relax();
  18
  19     if (pimple.momentumPredictor())
  20     {
  21         solve
  22         (
  23             UEqn
  24          ==
  25             fvc::reconstruct
  26             (
  27                 (
  28                   - ghf*fvc::snGrad(rho)
  29                   - fvc::snGrad(p_rgh)
  30                 ) * mesh.magSf()
  31             )
  32         );
  33     }