setMultiRegionDeltaT.H

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Global
    setMultiRegionDeltaT

Description
    Reset the timestep to maintain a constant maximum Courant numbers.
    Reduction of time-step is immediate, but increase is damped to avoid
    unstable oscillations.

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

if (adjustTimeStep)
{
    if (CoNum == -great)
    {
        CoNum = small;
    }

    if (DiNum == -great)
    {
        DiNum = small;
    }


    const scalar TFactorFluid = maxCo/(CoNum + small);
    const scalar TFactorSolid = maxDi/(DiNum + small);
    const scalar TFactorFilm = maxCo/(surfaceFilm.CourantNumber() + small);

    const scalar dt0 = runTime.deltaTValue();

    runTime.setDeltaT
    (
        min
        (
            dt0*min(min(TFactorFluid, min(TFactorFilm, TFactorSolid)), 1.2),
            maxDeltaT
        )
    );
}


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