setMultiRegionDeltaT.H

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/*---------------------------------------------------------------------------*\
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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
    (at your option) any later version.
 
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    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
    for more details.
 
    You should have received a copy of the GNU General Public License
    along with OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.
 
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
    (
        Foam::min
        (
            dt0
          * Foam::min
            (
                Foam::min
                (
                    TFactorFluid,
                    Foam::min(TFactorFilm, TFactorSolid)
                ),
                1.2
            ),
            maxDeltaT
        )
    );
}
 
 
// ************************************************************************* //