XiFoam.C

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License
    This file is part of OpenFOAM.

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Application
    XiFoam

Description
    Solver for compressible premixed/partially-premixed combustion with
    turbulence modelling.

    Combusting RANS code using the b-Xi two-equation model.
    Xi may be obtained by either the solution of the Xi transport
    equation or from an algebraic expression.  Both approaches are
    based on Gulder's flame speed correlation which has been shown
    to be appropriate by comparison with the results from the
    spectral model.

    Strain effects are encorporated directly into the Xi equation
    but not in the algebraic approximation.  Further work need to be
    done on this issue, particularly regarding the enhanced removal rate
    caused by flame compression.  Analysis using results of the spectral
    model will be required.

    For cases involving very lean Propane flames or other flames which are
    very strain-sensitive, a transport equation for the laminar flame
    speed is present.  This equation is derived using heuristic arguments
    involving the strain time scale and the strain-rate at extinction.
    the transport velocity is the same as that for the Xi equation.

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

#include "fvCFD.H"
#include "psiuReactionThermo.H"
#include "compressibleMomentumTransportModels.H"
#include "fluidThermophysicalTransportModel.H"
#include "laminarFlameSpeed.H"
#include "ignition.H"
#include "Switch.H"
#include "pimpleControl.H"
#include "CorrectPhi.H"
#include "fvModels.H"
#include "fvConstraints.H"

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

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

    #include "setRootCaseLists.H"
    #include "createTime.H"
    #include "createMesh.H"
    #include "createDyMControls.H"
    #include "initContinuityErrs.H"
    #include "readCombustionProperties.H"
    #include "createFields.H"
    #include "createFieldRefs.H"
    #include "createRhoUfIfPresent.H"

    turbulence->validate();

    #include "compressibleCourantNo.H"
    #include "setInitialDeltaT.H"

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

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

    while (pimple.run(runTime))
    {
        #include "readDyMControls.H"

        // Store divrhoU from the previous mesh so that it can be mapped
        // and used in correctPhi to ensure the corrected phi has the
        // same divergence
        autoPtr<volScalarField> divrhoU;
        if (correctPhi)
        {
            divrhoU = new volScalarField
            (
                "divrhoU",
                fvc::div(fvc::absolute(phi, rho, U))
            );
        }

        #include "compressibleCourantNo.H"
        #include "setDeltaT.H"

        fvModels.preUpdateMesh();

        // Store momentum to set rhoUf for introduced faces.
        autoPtr<volVectorField> rhoU;
        if (rhoUf.valid())
        {
            rhoU = new volVectorField("rhoU", rho*U);
        }

        // Update the mesh for topology change, mesh to mesh mapping
        mesh.update();

        runTime++;

        Info<< "Time = " << runTime.userTimeName() << nl << endl;

        // --- Pressure-velocity PIMPLE corrector loop
        while (pimple.loop())
        {
            if (pimple.firstPimpleIter() || moveMeshOuterCorrectors)
            {
                // Move the mesh
                mesh.move();

                if (mesh.changing())
                {
                    MRF.update();

                    if (correctPhi)
                    {
                        #include "correctPhi.H"
                    }

                    if (checkMeshCourantNo)
                    {
                        #include "meshCourantNo.H"
                    }
                }
            }

            if
            (
               !pimple.simpleRho()
             && pimple.firstPimpleIter()
            )
            {
                #include "rhoEqn.H"
            }

            fvModels.correct();

            #include "UEqn.H"
            #include "ftEqn.H"
            #include "bEqn.H"
            #include "EauEqn.H"
            #include "EaEqn.H"

            if (!ign.ignited())
            {
                thermo.heu() == thermo.he();
            }

            // --- Pressure corrector loop
            while (pimple.correct())
            {
                #include "pEqn.H"
            }

            if (pimple.turbCorr())
            {
                turbulence->correct();
                thermophysicalTransport->correct();
            }
        }

        rho = thermo.rho();

        runTime.write();

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

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

    return 0;
}


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