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)
{
    const scalar maxDeltaTFact =
        min(maxCo/(CoNum + SMALL), maxCo/(surfaceFilm.CourantNumber() + SMALL));
    const scalar deltaTFact =
        min(min(maxDeltaTFact, 1.0 + 0.1*maxDeltaTFact), 1.2);

    runTime.setDeltaT
    (
        min
        (
            deltaTFact*runTime.deltaTValue(),
            maxDeltaT
        )
    );

    Info<< "deltaT = " <<  runTime.deltaTValue() << endl;
}

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