/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   \\    /   O peration     |
    \\  /    A nd           | Copyright (C) 2004-2007 Hrvoje Jasak
     \\/     M anipulation  |
-------------------------------------------------------------------------------
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 2 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, write to the Free Software Foundation,
    Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA

Application
    elasticIncrSolidFoam

Description
    Transient/steady-state segregated finite-volume solver for small strain
    elastic solid bodies.

    Displacement Increment field DU is solved for using a incremental total
    Lagrangian approach,
    also generating the strain tensor field epsilon and stress tensor
    field sigma.

    With optional multi-material solid interface correction ensuring
    correct tractions on multi-material interfaces

Author
    Philip Cardiff
    multi-material by Tukovic et al. 2012

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

#include "fvCFD.H"
#include "rheologyModel.H"
#include "solidInterface.H"

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

int main(int argc, char *argv[])
{
#   include "setRootCase.H"

#   include "createTime.H"

#   include "createMesh.H"

#   include "createFields.H"

#   include "readDivDSigmaExpMethod.H"

#   include "createSolidInterface.H"

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

    Info<< "\nCalculating displacement field\n" << endl;

    while(runTime.loop())
    {
        Info<< "Time: " << runTime.timeName() << nl << endl;

#       include "readStressedFoamControls.H"

        int iCorr = 0;
        scalar initialResidual = 0;
        scalar relativeResidual = GREAT;
        lduMatrix::solverPerformance solverPerf;
        lduMatrix::debug = 0;

        do
        {
            DU.storePrevIter();

#           include "calculateDivDSigmaExp.H"

            //- linear momentum equation
            fvVectorMatrix DUEqn
            (
                fvm::d2dt2(rho, DU)
              ==
                fvm::laplacian(2*muf + lambdaf, DU, "laplacian(DDU,DU)")
              + divDSigmaExp
            );

            if(solidInterfaceCorr)
            {
                solidInterfacePtr->correct(DUEqn);
            }

            solverPerf = DUEqn.solve();

            if(iCorr == 0)
            {
                initialResidual = solverPerf.initialResidual();
            }

            DU.relax();

            if(solidInterfaceCorr)
            {
                gradDU = solidInterfacePtr->grad(DU);
            }
            else
            {
                gradDU = fvc::grad(DU);
            }

#           include "calculateRelativeResidual.H"

            Info << "\tTime " << runTime.value()
                << ", Corrector " << iCorr
                << ", Solving for " << DU.name()
                << " using " << solverPerf.solverName()
                << ", residual = " << solverPerf.initialResidual()
                << ", relative residual = " << relativeResidual << endl;
        }
        while
        (
            //solverPerf.initialResidual() > convergenceTolerance
            relativeResidual > convergenceTolerance
            &&
            ++iCorr < nCorr
        );

        Info << nl << "Time " << runTime.value() << ", Solving for " << DU.name()
            << ", Initial residual = " << initialResidual
            << ", Final residual = " << solverPerf.initialResidual()
            << ", Relative residual = " << relativeResidual
            << ", No outer iterations " << iCorr
            << nl << "ExecutionTime = " << runTime.elapsedCpuTime() << " s"
            << "  ClockTime = " << runTime.elapsedClockTime() << " s"
            << endl;

        lduMatrix::debug=0;

#       include "calculateDEpsilonDSigma.H"

        U += DU;
        sigma += DSigma;
        epsilon += DEpsilon;

#       include "writeFields.H"

#       include "calculateNetForces.H"

        Info<< "ExecutionTime = "
            << runTime.elapsedCpuTime()
            << " s\n\n" << endl;
    }

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

    return(0);
}


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