foam-extend4.1-coherent-io/applications/solvers/engine/turbDyMEngineFoam/meshCourantNo.H

/*---------------------------------------------------------------------------*\
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Global
    meshCourantNo

Description
    Calculates and outputs the mean and maximum mesh motion Courant Numbers.

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

scalar meshCoNum = 0.0;
scalar meanMeshCoNum = 0.0;

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

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

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

Info<< "Mesh Courant Number mean: " << meanMeshCoNum
    << " max: " << meshCoNum << endl;

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