setRDeltaT.H

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{
    volScalarField& rDeltaT = trDeltaT.ref();
 
    const dictionary& pimpleDict = pimple.dict();
 
    scalar maxCo
    (
        pimpleDict.getOrDefault<scalar>("maxCo", 0.2)
    );
 
    scalar maxDeltaT
    (
        pimpleDict.getOrDefault<scalar>("maxDeltaT", GREAT)
    );
 
    scalar rDeltaTSmoothingCoeff
    (
        pimpleDict.getOrDefault<scalar>("rDeltaTSmoothingCoeff", 0.02)
    );
 
    // Set the reciprocal time-step from the local Courant number
    rDeltaT.ref() = max
    (
        1/dimensionedScalar("maxDeltaT", dimTime, maxDeltaT),
        fvc::surfaceSum(max(mag(phi1), mag(phi2)))()()
       /((2*maxCo)*mesh.V())
    );
 
    // Update tho boundary values of the reciprocal time-step
    rDeltaT.correctBoundaryConditions();
 
    fvc::smooth(rDeltaT, rDeltaTSmoothingCoeff);
 
    auto limits = gMinMax(rDeltaT.primitiveField());
    limits.reset(1/(limits.max()+VSMALL), 1/(limits.min()+VSMALL));
 
    Info<< "Flow time scale min/max = "
        << limits.min() << ", " << limits.max() << endl;
}