/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  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);
}


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