/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   \\    /   O peration     |
    \\  /    A nd           | www.openfoam.com
     \\/     M anipulation  |
-------------------------------------------------------------------------------
    Copyright (C) 2011-2017 OpenFOAM Foundation
    Copyright (C) 2020 OpenCFD Ltd.
-------------------------------------------------------------------------------
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.

    OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
    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
    interFoam

Group
    grpMultiphaseSolvers

Description
    Solver for two incompressible, isothermal immiscible fluids using a VOF
    (volume of fluid) phase-fraction based interface capturing approach,
    with optional mesh motion and mesh topology changes including adaptive
    re-meshing.

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

#include "fvCFD.H"
#include "dynamicFvMesh.H"
#include "CMULES.H"
#include "EulerDdtScheme.H"
#include "localEulerDdtScheme.H"
#include "CrankNicolsonDdtScheme.H"
#include "subCycle.H"
#include "immiscibleIncompressibleTwoPhaseMixture.H"
#include "incompressibleInterPhaseTransportModel.H"
#include "turbulentTransportModel.H"
#include "pimpleControl.H"
#include "fvOptions.H"
#include "CorrectPhi.H"
#include "fvcSmooth.H"
// #include "DPMIncompressibleTurbulenceModel.H"
#include "../../FoamYade_two_phase/FoamYade.H" // YADE


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

int main(int argc, char *argv[])
{
    argList::addNote
    (
        "Solver for two incompressible, isothermal immiscible fluids"
        " using VOF phase-fraction based interface capturing.\n"
        "With optional mesh motion and mesh topology changes including"
        " adaptive re-meshing."
    );

    #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 "createAlphaFluxes.H"
    #include "initCorrectPhi.H"
    #include "createUfIfPresent.H"

    if (!LTS)
    {
        #include "CourantNo.H"
        #include "setInitialDeltaT.H"
    }
    // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
    
    bool gaussianInterp = true;
    FoamYade yadeCoupling(mesh,U, gradP, vGrad, divT, ddtU_f, g, uSourceDrag, alphac, uSource, uParticle, uCoeff, uInterp, gaussianInterp, rho, nu);
    yadeCoupling.setRhoP(partDensity.value());
    // yadeCoupling.setScalarProperties(partDensity.value(), rho.value(), nu.value());
    
    // A flow initialization, uncomment for testing. 
    forAll(U, cellI) 
    {
      U[cellI].x() = 100; 
    }
    
    Info<< "\nStarting time loop\n" << endl;

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

        if (LTS)
        {
            #include "setRDeltaT.H"
        }
        else
        {
            #include "CourantNo.H"
            #include "alphaCourantNo.H"
            #include "setDeltaT.H"
        }

        ++runTime;

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


        
        ddtU_f = fvc::ddt(U)+fvc::div(phi, U);
        gradP = fvc::grad(p);
        divT = 2*mu[0]*fvc::laplacian(alphac, U); // this has to be fixed in order to work with the mu field.
        vGrad = fvc::grad(U);

        yadeCoupling.setParticleAction(runTime.deltaT().value());



        // Update continuous phase volume fraction field
        alphac.correctBoundaryConditions();
        alphacf = fvc::interpolate(alphac);
        alphaPhic = alphacf * phi;
        
        uSource.correctBoundaryConditions(); 
        uSourceDrag.correctBoundaryConditions(); 



        // --- Pressure-velocity PIMPLE corrector loop
        while (pimple.loop())
        {
            if (pimple.firstIter() || moveMeshOuterCorrectors)
            {
                mesh.update();

                if (mesh.changing())
                {
                    // Do not apply previous time-step mesh compression flux
                    // if the mesh topology changed
                    if (mesh.topoChanging())
                    {
                        talphaPhi1Corr0.clear();
                    }

                    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"
                    }
                }
            }

            #include "alphaControls.H"
            #include "alphaEqnSubCycle.H"

            mixture.correct();

            if (pimple.frozenFlow())
            {
                continue;
            }

            #include "UEqn.H"

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

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

        runTime.write();

        yadeCoupling.setSourceZero(); 

        runTime.printExecutionTime(Info);
    }

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

    return 0;
}


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