compressibleMultiRegionCourantNo.H

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    scalar CoNum = -GREAT;
 
    forAll(fluidRegions, regioni)
    {
        if (fluidRegions[regioni].nInternalFaces())
        {
            const surfaceScalarField& phi =
                phaseSystemFluid[regioni].phi();
 
            scalarField sumPhi
            (
                fvc::surfaceSum(mag(phi))().primitiveField()
            );
 
            const surfaceScalarField& phi1 =
                phaseSystemFluid[regioni].phase1().phiRef();
 
            const surfaceScalarField& phi2 =
                phaseSystemFluid[regioni].phase2().phiRef();
 
            sumPhi = max
            (
                sumPhi,
                fvc::surfaceSum(mag(phi1))().primitiveField()
            );
 
            sumPhi = max
            (
                sumPhi,
                fvc::surfaceSum(mag(phi2))().primitiveField()
            );
 
 
            CoNum =
                0.5*gMax
                (
                    sumPhi/fluidRegions[regioni].V().field()
                )*runTime.deltaTValue();
 
            scalar UrCoNum = 0.5*gMax
            (
                fvc::surfaceSum(mag(phi1 - phi2))().primitiveField()
              / fluidRegions[regioni].V().field()
            )*runTime.deltaTValue(),
 
            CoNum = max(UrCoNum, CoNum);
        }
    }
 
    Info<< "Courant Number max: " << CoNum << endl;