/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  F ield         | foam-extend: Open Source CFD
   \\    /   O peration     |
    \\  /    A nd           | For copyright notice see file Copyright
     \\/     M anipulation  |
-------------------------------------------------------------------------------
License
    This file is part of foam-extend.

    foam-extend 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 3 of the License, or (at your
    option) any later version.

    foam-extend 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 foam-extend.  If not, see <http://www.gnu.org/licenses/>.

Application
    solidEquilibriumDisplacementFoam

Description
    Steady-state segregated finite-volume solver of linear-elastic,
    small-strain deformation of a solid body, with optional thermal
    diffusion and thermal stresses.

    Simple linear elasticity structural analysis code.
    Solves for the displacement vector field D, also generating the
    stress tensor field sigma.

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

#include "fvCFD.H"
#include "Switch.H"

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

int main(int argc, char *argv[])
{

#   include "setRootCase.H"

#   include "createTime.H"
#   include "createMesh.H"
#   include "readMechanicalProperties.H"
#   include "createFields.H"

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

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

    while (runTime.loop())
    {
        Info<< "Iteration: " << runTime.value() << nl << endl;

#       include "readSteadyStressFoamControls.H"

        solve
        (
            fvm::laplacian(2*mu + lambda, Dcorr, "laplacian(DD,Dcorr)")
          + fvc::div(sigmaExp + sigmaD)
        );

        D += accFac*Dcorr;

        {
            volTensorField gradDcorr = fvc::grad(Dcorr);

            sigmaExp = 
                (lambda - mu)*gradDcorr + mu*gradDcorr.T()
              + (lambda*I)*tr(gradDcorr);

            sigmaD += accFac*(mu*twoSymm(gradDcorr) + (lambda*I)*tr(gradDcorr));
        }

#       include "calculateStress.H"
#       include "kineticEnergyLimiter.H"

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

    Info<< "\n end \n";

    return 0;
}


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