QHDUEqn.H

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    Copyright (C) 2019 OpenCFD Ltd.
    Copyright (C) 2016-2019 ISP RAS (www.ispras.ru) UniCFD Group (www.unicfd.ru)
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License
    This file is part of OpenFOAM.

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Group 
    grpQGDcommon

Description
    Solution of momentum equation for QHD solver

\*---------------------------------------------------------------------------*/

    gradPf = fvsc::grad(p);
    Wf = tauQGDf*((Uf & gradUf) + gradPf/rhof - BdFrcf);
    
    surfaceVectorField phiUfWf = mesh.Sf() & (Uf * Wf);
    phiUfWf.setOriented(true);
    phiUf = qgdFlux(phi,U,Uf);
    phiUf.setOriented(true);
    phiUf -= phiUfWf;

    // --- Solve U
    if (implicitDiffusion)
    {
        solve
        (
            fvm::ddt(U)
            +
            fvc::div(phiUf)
            -
            fvm::laplacian(muf/rhof,U)
            -
            fvc::div(muf/rhof * mesh.Sf() & qgdInterpolate(Foam::T(fvc::grad(U))))
            ==
            -
            fvc::grad(p)/rho
            +
            BdFrc
            +
            USu
        );
    }
    else
    {
        solve
        (
            fvm::ddt(U)
            +
            fvc::div(phiUf)
            -
            fvc::laplacian(muf/rhof,U)
            -
            fvc::div(muf/rhof * mesh.Sf() & qgdInterpolate(Foam::T(fvc::grad(U))))
            ==
            -
            fvc::grad(p)/rho
            +
            BdFrc
            +
            USu
        );
    }

// ************************************************************************* //