/*---------------------------------------------------------------------------*\
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-------------------------------------------------------------------------------
    Copyright (C) 2011-2017 OpenFOAM Foundation
-------------------------------------------------------------------------------
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 3 of the License, or
    (at your option) any later version.

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    for more details.

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    along with OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.

Application
    pisoFoam

Group
    grpIncompressibleSolvers

Description
    Transient solver for incompressible, turbulent flow, using the PISO
    algorithm.

    \heading Solver details
    The solver uses the PISO algorithm to solve the continuity equation:

        \f[
            \div \vec{U} = 0
        \f]

    and momentum equation:

        \f[
            \ddt{\vec{U}} + \div \left( \vec{U} \vec{U} \right) - \div \gvec{R}
          = - \grad p
        \f]

    Where:
    \vartable
        \vec{U} | Velocity
        p       | Pressure
        \vec{R} | Stress tensor
    \endvartable

    Sub-models include:
    - turbulence modelling, i.e. laminar, RAS or LES
    - run-time selectable MRF and finite volume options, e.g. explicit porosity

    \heading Required fields
    \plaintable
        U       | Velocity [m/s]
        p       | Kinematic pressure, p/rho [m2/s2]
        \<turbulence fields\> | As required by user selection
    \endplaintable

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

#include "fvCFD.H"
#include "singlePhaseTransportModel.H"
#include "turbulentTransportModel.H"
#include "pisoControl.H"
#include "fvOptions.H"

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

int main(int argc, char *argv[])
{
    argList::addNote
    (
        "Transient solver for incompressible, turbulent flow,"
        " using the PISO algorithm."
    );

    #include "postProcess.H"

    #include "addCheckCaseOptions.H"
    #include "setRootCaseLists.H"
    #include "createTime.H"
    #include "createMesh.H"
    #include "createControl.H"
    #include "createFields.H"
    #include "initContinuityErrs.H"

    turbulence->validate();

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

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

    while (runTime.loop())
    {
        Info<< "Time = " << runTime.timeName() << nl << endl;

        #include "CourantNo.H"

        // Pressure-velocity PISO corrector
        {
            #include "UEqn.H"

            // --- PISO loop
            while (piso.correct())
            {
                #include "pEqn.H"
            }
        }

        laminarTransport.correct();
        turbulence->correct();

        runTime.write();

        runTime.printExecutionTime(Info);
    }

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

    return 0;
}


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