setMultiRegionDeltaT.H

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    Copyright (C) 2011 OpenFOAM Foundation
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License
    This file is part of OpenFOAM.
 
    OpenFOAM is free software: you can redistribute it and/or modify it
    under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
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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
        )
    );
}
 
 
// ************************************************************************* //