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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    for more details.
 
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Global
    setMultiRegionDeltaT
 
Description
    Reset the timestep to maintain a constant maximum courant and
    diffusion 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;
    }
 
    scalar maxDeltaTFluid = maxCo/(CoNum + SMALL);
    scalar maxDeltaTSolid = maxDi/(DiNum + SMALL);
 
    const scalar deltaTFluid =
        Foam::min(Foam::min(maxDeltaTFluid, 1.0 + 0.1*maxDeltaTFluid), 1.2);
 
    runTime.setDeltaT
    (
        Foam::min
        (
            Foam::min(deltaTFluid, maxDeltaTSolid)*runTime.deltaTValue(),
            maxDeltaT
        )
    );
 
    Info<< "deltaT = " <<  runTime.deltaTValue() << endl;
}
 
// ************************************************************************* //