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-------------------------------------------------------------------------------
    Copyright (C) 2011-2017 OpenFOAM Foundation
-------------------------------------------------------------------------------
License
    This file is part of OpenFOAM.

    OpenFOAM is free software: you can redistribute it and/or modify it
    under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

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    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
    for more details.

    You should have received a copy of the GNU General Public License
    along with OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.

Application
    multiphaseInterFoam

Group
    grpMultiphaseSolvers

Description
    Solver for N incompressible fluids which captures the interfaces and
    includes surface-tension and contact-angle effects for each phase, with
    optional mesh motion and mesh topology changes.

    Turbulence modelling is generic, i.e. laminar, RAS or LES may be selected.

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

#include "fvCFD.H"
#include "dynamicFvMesh.H"
#include "multiphaseMixture.H"
#include "turbulentTransportModel.H"
#include "pimpleControl.H"
#include "fvOptions.H"
#include "CorrectPhi.H"

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

int main(int argc, char *argv[])
{
    argList::addNote
    (
        "Solver for N incompressible fluids which captures the interfaces and"
        " includes surface-tension and contact-angle effects for each phase.\n"
        "With optional mesh motion and mesh topology changes."
    );

    #include "postProcess.H"

    #include "addCheckCaseOptions.H"
    #include "setRootCaseLists.H"
    #include "createTime.H"
    #include "createDynamicFvMesh.H"
    #include "initContinuityErrs.H"
    #include "createDyMControls.H"
    #include "createFields.H"
    #include "initCorrectPhi.H"
    #include "createUfIfPresent.H"

    turbulence->validate();

    #include "CourantNo.H"
    #include "setInitialDeltaT.H"

    const surfaceScalarField& rhoPhi(mixture.rhoPhi());

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

    Info<< "\nStarting time loop\n" << endl;

    while (runTime.run())
    {
        #include "readDyMControls.H"
        #include "CourantNo.H"
        #include "alphaCourantNo.H"
        #include "setDeltaT.H"

        ++runTime;

        Info<< "Time = " << runTime.timeName() << nl << endl;

        // --- Pressure-velocity PIMPLE corrector loop
        while (pimple.loop())
        {
            if (pimple.firstIter() || moveMeshOuterCorrectors)
            {
                scalar timeBeforeMeshUpdate = runTime.elapsedCpuTime();

                mesh.update();

                if (mesh.changing())
                {
                    Info<< "Execution time for mesh.update() = "
                        << runTime.elapsedCpuTime() - timeBeforeMeshUpdate
                        << " s" << endl;

                    gh = (g & mesh.C()) - ghRef;
                    ghf = (g & mesh.Cf()) - ghRef;

                    MRF.update();

                    if (correctPhi)
                    {
                        // Calculate absolute flux
                        // from the mapped surface velocity
                        phi = mesh.Sf() & Uf();

                        #include "correctPhi.H"

                        // Make the flux relative to the mesh motion
                        fvc::makeRelative(phi, U);

                        mixture.correct();
                    }

                    if (checkMeshCourantNo)
                    {
                        #include "meshCourantNo.H"
                    }
                }
            }

            mixture.solve();
            rho = mixture.rho();

            #include "UEqn.H"

            // --- Pressure corrector loop
            while (pimple.correct())
            {
                #include "pEqn.H"
            }

            if (pimple.turbCorr())
            {
                turbulence->correct();
            }
        }

        runTime.write();

        runTime.printExecutionTime(Info);
    }

    Info<< "End\n" << endl;

    return 0;
}


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