setDeltaT.H

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Global
    setDeltaT

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

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

if (adjustTimeStep)
{
    scalar deltaT =
        min(maxCo/(CoNum + small), maxAlphaCo/(alphaCoNum + small))
       *runTime.deltaTValue();
    deltaT = min
    (
        min(deltaT, runTime.deltaTValue() + 0.1*deltaT),
        1.2*runTime.deltaTValue()
    );
    runTime.setDeltaT(min(deltaT, maxDeltaT));

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

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