/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  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
    elasticContactIncrSolidFoam

Description
    Transient/steady-state segregated finite-volume solver for small strain
    elastic solid bodies in contact, using an incremental total Lagrangian
    approach.
    Works in parallel.

    Solves for the displacement increment vector field DU, also generating the
    stress tensor field sigma.

    It is only for frictionless contact, friction not implemented yet.

Author
    Philip Cardiff

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

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

#include "volPointInterpolation.H"
#include "pointPatchInterpolation.H"
#include "primitivePatchInterpolation.H"
#include "fixedValuePointPatchFields.H"
#include "pointFields.H"
#include "pointMesh.H"
#include "pointBoundaryMesh.H"
#include "primitivePatchInterpolation.H"
#include "twoDPointCorrector.H"
//#include "leastSquaresVolPointInterpolation.H"

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

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

#   include "createTime.H"

#   include "createMesh.H"

#   include "createFields.H"

#   include "readDivDSigmaExpMethod.H"

#   include "createGlobalToLocalFaceZonePointMap.H"

#   include "createSolidInterface.H"

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

  Info<< "\nStarting time loop\n" << endl;

  for (runTime++; !runTime.end(); runTime++)
    {
      Info<< "Time: " << runTime.timeName() << endl;

#     include "readContactControls.H"

#     include "readStressedFoamControls.H"

      //-- for moving the mesh and then back again
      vectorField oldMeshPoints = mesh.allPoints();

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

      //- reset DU to zero at the start of the time-step if
      //- a predictor is not required
      if(!predictor)
      {
          DU = dimensionedVector("zero", dimLength, vector::zero);
      }

      do //- start of momentum loop
      {
          DU.storePrevIter();

          //- correct the contact boundaries
          if(iCorr % uEqnContactCorrFreq == 0)
          {
              Info << "\t\tCorrecting contact in the momentum loop "
                  << "iteration: " << iCorr
                  << ", residual: " << residual
                  << endl;
//#             include "moveMeshLeastSquares.H"
#             include "moveSolidMesh.H"
              contact.correct();
              mesh.movePoints(oldMeshPoints);
          }

#         include "calculateDivDSigmaExp.H"

          fvVectorMatrix DUEqn
          (
              fvm::d2dt2(rho, DU)
            ==
              fvm::laplacian(2*mu + lambda, DU, "laplacian(DDU,DU)")
            + divDSigmaExp
          );

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

          solverPerf = DUEqn.solve();

          DU.relax();

          solverName = solverPerf.solverName();

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

          U = U.oldTime() + DU;

          residual = solverPerf.initialResidual();

          //****************************************************//
          // The contact residual is the initial residual for the
          // first iteration of the momentum equation
          //****************************************************//
          if(iCorr == 0)
          {
              initialResidual = solverPerf.initialResidual();
          }

#         include "calculateRelativeResidual.H"

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

      // Print out info per contact iteration
      Info << "\t\tSolving for " << DU.name()
          << " using " << solverName
          << ", Initial residual = " << initialResidual
          << ", Final residual = " << solverPerf.initialResidual()
          << ", No outer iterations " << iCorr << endl;

      lduMatrix::debug = 1;

#     include "calculateDEpsilonDSigma.H"

      epsilon += DEpsilon;

      sigma += DSigma;

#     include "writeFields.H"

      //#     include "writeBoundaryNetForces.H"

      //#     include "moveMeshLeastSquares.H"
      //#     include "moveSolidMesh.H"
      //#     include "printContactResults.H"
      //mesh.movePoints(oldMeshPoints);

      Info<< "ExecutionTime = " << runTime.elapsedCpuTime() << " s"
          << "  ClockTime = " << runTime.elapsedClockTime() << " s"
          << endl << endl;
    }

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

  return(0);
}


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