/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  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
    elasticNonLinTLSolidFoam

Description
    Finite volume structural solver employing a total strain total
    Lagrangian approach.

    Valid for finite strains, finite displacements and finite rotations.

Author
    Micheal Leonard
    Philip Cardiff

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

#include "fvCFD.H"
#include "rheologyModel.H"
#include "leastSquaresVolPointInterpolation.H"
#include "twoDPointCorrector.H"
#include "solidDirectionMixedFvPatchVectorField.H"

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

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

#   include "createTime.H"

#   include "createMesh.H"

#   include "createFields.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;
        lduMatrix::solverPerformance solverPerf;
        scalar relativeResidual = GREAT;

        lduMatrix::debug=0;

        do
        {
            U.storePrevIter();

#           include "correctDirectionMixedTL.H"

            fvVectorMatrix UEqn
            (
                fvm::d2dt2(rho, U)
              ==
                fvm::laplacian(2*mu + lambda, U, "laplacian(DU,U)")
              + fvc::div
                (
                  - ( (mu + lambda) * gradU )
                  + ( mu * gradU.T() )
                  + ( mu * (gradU & gradU.T()) )
                  + ( lambda * tr(gradU) * I )
                  + ( 0.5 * lambda * tr(gradU & gradU.T()) * I )
                  + ( sigma & gradU ),
                  "div(sigma)"
                )
            );

            solverPerf = UEqn.solve();

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

            U.relax();

            gradU = fvc::grad(U);

#           include "calculateEpsilonSigma.H"

#           include "calculateRelativeResidual.H"

            Info << "\tTime " << runTime.value()
                << ", Corrector " << iCorr
                << ", Solving for " << U.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 " << U.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 "writeFields.H"

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

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

    return(0);
}


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