foam-extend4.1-coherent-io/applications/solvers/incompressible/shallowWaterFoam/CourantNo.H

/*---------------------------------------------------------------------------*\
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   \\    /   O peration     | Version:     4.1
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Global
    CourantNo

Description
    Calculates and outputs the maximum Courant Number.

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


scalar CoNum = 0.0;
scalar meanCoNum = 0.0;
scalar waveCoNum = 0.0;

if (mesh.nInternalFaces())
{
    surfaceScalarField SfUfbyDelta =
        mesh.surfaceInterpolation::deltaCoeffs()
       *mag(phi)/fvc::interpolate(h);

    CoNum = max(SfUfbyDelta/mesh.magSf())
        .value()*runTime.deltaT().value();

    meanCoNum = (sum(SfUfbyDelta)/sum(mesh.magSf()))
        .value()*runTime.deltaT().value();

    // Gravity wave Courant number
    waveCoNum =
        0.5*max
        (
            mesh.surfaceInterpolation::deltaCoeffs()
           *sqrt(fvc::interpolate(h))
        ).value()*sqrt(magg).value()*runTime.deltaT().value();
}

Info<< "Courant number mean: " << meanCoNum
    << " max: " << CoNum << endl;

Info<< "Gravity wave Courant number max: " << waveCoNum
    << endl;


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