setRDeltaT.C

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#include "multiphaseEuler.H"
#include "fvcSmooth.H"
#include "fvcSurfaceIntegrate.H"
 
// * * * * * * * * * * * * * Private Member Functions  * * * * * * * * * * * //
 
void Foam::solvers::multiphaseEuler::setRDeltaT()
{
    volScalarField& rDeltaT = trDeltaT.ref();
 
    const dictionary& pimpleDict = pimple.dict();
 
    const scalar maxCo
    (
        pimpleDict.lookupOrDefault<scalar>("maxCo", 0.2)
    );
 
    const scalar rDeltaTSmoothingCoeff
    (
        pimpleDict.lookupOrDefault<scalar>("rDeltaTSmoothingCoeff", 0.02)
    );
 
    surfaceScalarField maxPhi("maxPhi", phi);
 
    forAll(movingPhases, movingPhasei)
    {
        maxPhi = max(maxPhi, mag(movingPhases[movingPhasei].phi()));
    }
 
    // Set the reciprocal time-step from the local Courant number
    rDeltaT.internalFieldRef() = fvc::surfaceSum(maxPhi)/((2*maxCo)*mesh.V());
 
    // Clip to user-defined maximum and minimum time-steps
    scalar minRDeltaT = gMin(rDeltaT.primitiveField());
    if (pimpleDict.found("maxDeltaT") || minRDeltaT < rootVSmall)
    {
        const scalar clipRDeltaT = 1/pimpleDict.lookup<scalar>("maxDeltaT");
        rDeltaT.max(clipRDeltaT);
        minRDeltaT = max(minRDeltaT, clipRDeltaT);
    }
    if (pimpleDict.found("minDeltaT"))
    {
        const scalar clipRDeltaT = 1/pimpleDict.lookup<scalar>("minDeltaT");
        rDeltaT.min(clipRDeltaT);
        minRDeltaT = min(minRDeltaT, clipRDeltaT);
    }
 
    Info<< "Flow time scale min/max = "
        << gMin(1/rDeltaT.primitiveField()) << ", " << 1/minRDeltaT << endl;
 
    // Update the boundary values of the reciprocal time-step
    rDeltaT.correctBoundaryConditions();
 
    fvc::smooth(rDeltaT, rDeltaTSmoothingCoeff);
 
    Info<< "Smoothed flow time scale min/max = "
        << gMin(1/rDeltaT.primitiveField())
        << ", " << gMax(1/rDeltaT.primitiveField()) << endl;
 
    if (faceMomentum)
    {
        if (!trDeltaTf.valid())
        {
            trDeltaTf = new surfaceScalarField
            (
                IOobject
                (
                    fv::localEulerDdt::rDeltaTfName,
                    runTime.name(),
                    mesh,
                    IOobject::READ_IF_PRESENT,
                    IOobject::AUTO_WRITE
                ),
                mesh,
                dimensionedScalar(dimless/dimTime, 1)
            );
        }
 
        trDeltaTf.ref() = fvc::interpolate(rDeltaT);
    }
}
 
 
// ************************************************************************* //