UEqn.H

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    // Construct the Momentum equation
 
    MRF.correctBoundaryVelocity(U);
 
    tmp<fvVectorMatrix> UEqn
    (
        fvm::div(phi, U)
      + MRF.DDt(U)
      + turbulence->divDevReff(U)
      ==
        fvOptions(U)
    );
 
    UEqn().relax();
 
    // Include the porous media resistance and solve the momentum equation
    // either implicit in the tensorial resistance or transport using by
    // including the spherical part of the resistance in the momentum diagonal
 
    tmp<volScalarField> trAU;
    tmp<volTensorField> trTU;
 
    if (pressureImplicitPorosity)
    {
        tmp<volTensorField> tTU = tensor(I)*UEqn().A();
        pZones.addResistance(UEqn(), tTU());
        trTU = inv(tTU());
        trTU().rename("rAU");
 
        fvOptions.constrain(UEqn());
 
        volVectorField gradp(fvc::grad(p));
 
        for (int UCorr=0; UCorr<nUCorr; UCorr++)
        {
            U = trTU() & (UEqn().H() - gradp);
        }
        U.correctBoundaryConditions();
 
        fvOptions.correct(U);
    }
    else
    {
        pZones.addResistance(UEqn());
 
        fvOptions.constrain(UEqn());
 
        solve(UEqn() == -fvc::grad(p));
 
        fvOptions.correct(U);
 
        trAU = 1.0/UEqn().A();
        trAU().rename("rAU");
    }