/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  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
    elasticThermalSolidFoam

Description
    Transient/steady-state segregated finite-volume solver for small strain
    elastic thermal solid bodies. Temperature is solved and then coupled
    displacement is solved.

    Displacement field U is solved for using a total Lagrangian approach,
    also generating the strain tensor field epsilon and stress tensor
    field sigma and temperature field T.


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

#include "fvCFD.H"
#include "rheologyModel.H"
#include "thermalModel.H"

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

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

#   include "createTime.H"

#   include "createMesh.H"

#   include "createFields.H"

#   include "readSigmaExpMethod.H"

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

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

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

#       include "readStressedFoamControls.H"

        int iCorr = 0;
        scalar initialResidual = GREAT;
        scalar residual = GREAT;
        lduMatrix::solverPerformance solverPerfU;
        lduMatrix::solverPerformance solverPerfT;

        lduMatrix::debug=0;

        do
        {
            U.storePrevIter();

#           include "calculateSigmaExp.H"

            //- energy equation
            fvScalarMatrix TEqn
            (
                fvm::ddt(rhoC, T) == fvm::laplacian(k, T, "laplacian(k,T)")
            );

            solverPerfT = TEqn.solve();

            T.relax();

            Info << "\tTime " << runTime.value()
                << ", Corrector " << iCorr << nl
                << "\t\tSolving for " << T.name()
                << " using " << solverPerfT.solverName()
                << ", residual = " << solverPerfT.initialResidual() << endl;

            //- linear momentum equaiton
            fvVectorMatrix UEqn
            (
                fvm::d2dt2(rho, U)
              ==
                fvm::laplacian(2*mu + lambda, U, "laplacian(DU,U)")
              + sigmaExp
              - fvc::grad(threeKalpha*(T-T0),"grad(threeKalphaDeltaT)")
            );

            solverPerfU = UEqn.solve();

            if(iCorr == 0)
            {
                initialResidual = max
                (
                    solverPerfU.initialResidual(),
                    solverPerfT.initialResidual()
                );
            }

            residual = max
            (
                solverPerfU.initialResidual(),
                solverPerfT.initialResidual()
            );

            U.relax();

            gradU = fvc::grad(U);

            Info << "\t\tSolving for " << U.name()
                << " using " << solverPerfU.solverName()
                << ", residual = " << solverPerfU.initialResidual() << endl;
        }
        while
        (
            residual > convergenceTolerance
            &&
            ++iCorr < nCorr
        );

        Info << nl << "Time " << runTime.value()
            << ", Solving for " << U.name()
            << ", Solving for " << T.name()
            << ", Initial residual = " << initialResidual
            << ", Final U residual = " << solverPerfU.initialResidual()
            << ", Final T residual = " << solverPerfT.initialResidual()
            << ", No outer iterations " << iCorr
            << nl << "ExecutionTime = " << runTime.elapsedCpuTime() << " s"
            << "  ClockTime = " << runTime.elapsedClockTime() << " s"
            << endl;

        lduMatrix::debug=0;

#       include "calculateEpsilonSigma.H"

#       include "writeFields.H"

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

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

    return(0);
}


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