setInterfaceRDeltaT.C

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#include "twoPhaseVoFSolver.H"
#include "fvcSmooth.H"
#include "fvcSurfaceIntegrate.H"
#include "fvcAverage.H"
 
// * * * * * * * * * * * * * Private Member Functions  * * * * * * * * * * * //
 
void Foam::solvers::twoPhaseVoFSolver::setInterfaceRDeltaT
(
    volScalarField& rDeltaT
)
{
    const dictionary& pimpleDict = pimple.dict();
 
    const scalar maxCo
    (
        pimpleDict.lookupOrDefault<scalar>("maxCo", 0.9)
    );
 
    const scalar maxAlphaCo
    (
        pimpleDict.lookupOrDefault<scalar>("maxAlphaCo", 0.2)
    );
 
    const scalar rDeltaTSmoothingCoeff
    (
        pimpleDict.lookupOrDefault<scalar>("rDeltaTSmoothingCoeff", 0.1)
    );
 
    const label nAlphaSpreadIter
    (
        pimpleDict.lookupOrDefault<label>("nAlphaSpreadIter", 1)
    );
 
    const scalar alphaSpreadDiff
    (
        pimpleDict.lookupOrDefault<scalar>("alphaSpreadDiff", 0.2)
    );
 
    const scalar alphaSpreadMax
    (
        pimpleDict.lookupOrDefault<scalar>("alphaSpreadMax", 0.99)
    );
 
    const scalar alphaSpreadMin
    (
        pimpleDict.lookupOrDefault<scalar>("alphaSpreadMin", 0.01)
    );
 
    const label nAlphaSweepIter
    (
        pimpleDict.lookupOrDefault<label>("nAlphaSweepIter", 5)
    );
 
    if (maxAlphaCo < maxCo)
    {
        // Further limit the reciprocal time-step
        // in the vicinity of the interface
 
        volScalarField alpha1Bar(fvc::average(alpha1));
 
        rDeltaT.internalFieldRef() =
            max
            (
                rDeltaT(),
                pos0(alpha1Bar() - alphaSpreadMin)
               *pos0(alphaSpreadMax - alpha1Bar())
               *fvc::surfaceSum(mag(phi))()()
               /((2*maxAlphaCo)*mesh.V())
            );
    }
 
    // Update the boundary values of the reciprocal time-step
    rDeltaT.correctBoundaryConditions();
 
    Info<< "Flow and interface time scale min/max = "
        << gMin(1/rDeltaT.primitiveField())
        << ", " << gMax(1/rDeltaT.primitiveField()) << endl;
 
    if (rDeltaTSmoothingCoeff < 1.0)
    {
        fvc::smooth(rDeltaT, rDeltaTSmoothingCoeff);
    }
 
    if (nAlphaSpreadIter > 0)
    {
        fvc::spread
        (
            rDeltaT,
            alpha1,
            nAlphaSpreadIter,
            alphaSpreadDiff,
            alphaSpreadMax,
            alphaSpreadMin
        );
    }
 
    if (nAlphaSweepIter > 0)
    {
        fvc::sweep(rDeltaT, alpha1, nAlphaSweepIter, alphaSpreadDiff);
    }
 
    Info<< "Smoothed flow time scale min/max = "
        << gMin(1/rDeltaT.primitiveField())
        << ", " << gMax(1/rDeltaT.primitiveField()) << endl;
}
 
 
// ************************************************************************* //