/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  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
    elasticIncrAcpSolidFoam

Description
    Incremental form of elasticAcpSolidFoam
    arbitrary crack propagation solver

Author
    Zeljko Tukovic, FSB Zagreb
    Declan Carolan UCD
    Philip Cardiff UCD

\*---------------------------------------------------------------------------*/
#include "fvCFD.H"
#include "constitutiveModel.H"
//#include "componentReferenceList.H"
#include "crackerFvMesh.H"
#include "processorPolyPatch.H"
#include "SortableList.H"
#include "solidInterface.H"
#include "solidCohesiveFvPatchVectorField.H"
#include "solidCohesiveFixedModeMixFvPatchVectorField.H"

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

int main(int argc, char *argv[])
{
# include "setRootCase.H"
# include "createTime.H"
# include "createCrackerMesh.H"
# include "createFields.H"
# include "createCrack.H"
  //# include "createReference.H"
# include "createHistory.H"
# include "readDivDSigmaExpMethod.H"
# include "createSolidInterfaceIncrNoModify.H"

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

  Info<< "\nStarting time loop\n" << endl;
  
  lduMatrix::debug = 0;

  scalar maxEffTractionFraction = 0;
  
  while (runTime.run())
    {
#     include "readSolidMechanicsControls.H"
#     include "setDeltaT.H"
      
      runTime++;
      
      Info<< "\nTime: " << runTime.timeName() << " s\n" << endl;
      
      volScalarField rho = rheology.rho();
      volScalarField mu = rheology.mu();
      volScalarField lambda = rheology.lambda();
      surfaceScalarField muf = fvc::interpolate(mu);
      surfaceScalarField lambdaf = fvc::interpolate(lambda);
      
      solidInterfacePtr->modifyProperties(muf, lambdaf);
      //#     include "waveCourantNo.H"
      
      int iCorr = 0;
      lduMatrix::solverPerformance solverPerf;
      scalar initialResidual = 0;
      scalar relativeResidual = 1;
      //scalar forceResidual = 1;
      label nFacesToBreak = 0;
      label nCoupledFacesToBreak = 0;
      bool topoChange = false;
      
      // DU from the previous timestep is usually a good guess
      // for the next timestep, but it can cause faces to prematurely
      // crack.
      // so I will reduce DU here to stop this happening
      if(!predictor)
	{
	  DU *= 0.0;
	}

      do
        {
	  surfaceVectorField n = mesh.Sf()/mesh.magSf();
	  do
            {
	      DU.storePrevIter();
	      
#             include "calculateDivDSigmaExp.H"

	      fvVectorMatrix DUEqn
                (
		 rho*fvm::d2dt2(DU)
                 ==
		 fvm::laplacian(2*muf + lambdaf, DU, "laplacian(DDU,DU)")
		 + divDSigmaExp
		 );
	      
	      //#             include "setReference.H"

	      solidInterfacePtr->correct(DUEqn);

	      //DUEqn.relax();

	      solverPerf = DUEqn.solve();
	      
	      if(aitkenRelax)
		{
#                 include "aitkenRelaxation.H"
		}
	      else
		{	  
		  DU.relax();
		}
	      
	      if(iCorr == 0)
                {
		  initialResidual = solverPerf.initialResidual();
		  aitkenInitialRes = gMax(mag(DU.internalField()));
                }
	      
	      //gradDU = solidInterfacePtr->grad(DU);
	      gradDU = fvc::grad(DU); // use leastSquaresSolidInterface grad scheme

#             include "calculateRelativeResidual.H"

	      if(iCorr % infoFrequency == 0)
		{
		  Info << "\tTime " << runTime.value()
		       << ", Corr " << iCorr
		       << ", Solving for " << DU.name()
		       << " using " << solverPerf.solverName()
		       << ", res = " << solverPerf.initialResidual()
		       << ", rel res = " << relativeResidual;
		  if(aitkenRelax) Info << ", aitken = " << aitkenTheta;
		  Info << ", inner iters " << solverPerf.nIterations() << endl;
		}
            }
	  while
            (
 	     //iCorr++ == 0
	     iCorr++ < 10
	     ||
	     (
	      //solverPerf.initialResidual() > convergenceTolerance
	      relativeResidual > convergenceTolerance
	      &&
	      iCorr < nCorr
	      )
	     );

	  Info << "Solving for " << DU.name() << " using "
	       << solverPerf.solverName()
	       << ", Initial residual = " << initialResidual
	       << ", Final residual = " << solverPerf.initialResidual()
	       << ", No outer iterations " << iCorr
	       << ", Relative residual " << relativeResidual << endl;
	  
#         include "calculateTraction.H"
#         include "updateCrack.H"

	  Info << "Max effective traction fraction: " << maxEffTractionFraction << endl;

	  // reset counter if faces want to crack
	  if((nFacesToBreak > 0)  || (nCoupledFacesToBreak > 0)) iCorr = 0;
        }
      while( (nFacesToBreak > 0)  || (nCoupledFacesToBreak > 0));
      
      if(cohesivePatchDUPtr)
	{
	  if(returnReduce(cohesivePatchDUPtr->size(), sumOp<label>()))
	    {
	      cohesivePatchDUPtr->cracking();
	    }
	}
      else
	{
	  if ( returnReduce(cohesivePatchDUFixedModePtr->size(), sumOp<label>()) )
	    {
	      Pout << "Number of faces in crack: " << cohesivePatchDUFixedModePtr->size()
	       	   << endl;
	      cohesivePatchDUFixedModePtr->relativeSeparationDistance();
	    }
	}

#     include "calculateDEpsilonDSigma.H"

      // update total quantities
      U += DU;
      epsilon += DEpsilon;
      sigma += DSigma;

#     include "writeFields.H"
#     include "writeHistory.H"

      Info<< "ExecutionTime = " << runTime.elapsedCpuTime() << " s"
	  << "  ClockTime = " << runTime.elapsedClockTime() << " s\n\n"
	  << endl;
    }
  
  Info<< "End\n" << endl;
  
  return(0);
}


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