7c684b925d
These functions adjusts the time step to match a reaction process. The
adjustTimeStepToChemistry fucntion adjusts based on the chemistry
model's stored chemical time step, and adjustTimeStepToCombustion
adjusts to match bulk reaction time scales. The latter requires
specification of a Courant-like number, to control approximately how
much of the reaction is permitted to be completed in a single
time-step.
These functions allow the solver to temporally resolve chemical changes,
in order to better couple the reactions with the transport, or in order
improve the time-accuracy of post-processing.
Example usage by dictionary specification:
adjustTimeStepToChemistry1
{
type adjustTimeStepToChemistry;
libs ("libchemistryModel.so");
}
adjustTimeStepToCombustion1
{
type adjustTimeStepToCombustion;
libs ("libchemistryModel.so");
maxCo 0.1;
}
Example usage via the included packaged function:
#includeFunc adjustTimeStepToChemistry
#includeFunc adjustTimeStepToCombustion(maxCo=0.1)
29 lines
1.3 KiB
C++
29 lines
1.3 KiB
C++
/*--------------------------------*- C++ -*----------------------------------*\
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========= |
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\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
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\\ / O peration | Website: https://openfoam.org
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\\ / A nd | Version: dev
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\\/ M anipulation |
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-------------------------------------------------------------------------------
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Description
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Adjusts the time step to a combustion model's bulk reaction time scales
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\*---------------------------------------------------------------------------*/
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type adjustTimeStepToCombustion;
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libs ("libchemistryModel.so");
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//phase <phaseName>; // Optional name of the phase to which the
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// combustion model applies
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maxCo <maxCo>; // Maximum combustion "Courant" number. The
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// maximum fraction of the total reaction
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// time-scale that should be evolved in a single
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// time-step.
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//extrapolate no; // Extrapolate reductions in time-step to try and
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// better catch the "onset" of reaction. Can lead
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// to time-step oscillation.
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// ************************************************************************* //
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