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b99817d924
Combined 'dQ()' and 'Sh()' into 'Qdot()' which returns the heat-release rate in the normal units [kg/m/s3] and used as the heat release rate source term in the energy equations, to set the field 'Qdot' in several combustion solvers and for the evaluation of the local time-step when running LTS.
135 lines
3.8 KiB
C
135 lines
3.8 KiB
C
/*---------------------------------------------------------------------------*\
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========= |
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\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
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\\ / O peration |
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\\ / A nd | Copyright (C) 2011-2016 OpenFOAM Foundation
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\\/ M anipulation |
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-------------------------------------------------------------------------------
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License
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This file is part of OpenFOAM.
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OpenFOAM is free software: you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License
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along with OpenFOAM. If not, see <http://www.gnu.org/licenses/>.
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\*---------------------------------------------------------------------------*/
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{
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volScalarField& rDeltaT = trDeltaT.ref();
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const dictionary& pimpleDict = pimple.dict();
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// Maximum flow Courant number
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scalar maxCo(readScalar(pimpleDict.lookup("maxCo")));
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// Maximum time scale
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scalar maxDeltaT(pimpleDict.lookupOrDefault<scalar>("maxDeltaT", GREAT));
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// Smoothing parameter (0-1) when smoothing iterations > 0
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scalar rDeltaTSmoothingCoeff
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(
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pimpleDict.lookupOrDefault<scalar>("rDeltaTSmoothingCoeff", 0.1)
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);
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// Damping coefficient (1-0)
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scalar rDeltaTDampingCoeff
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(
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pimpleDict.lookupOrDefault<scalar>("rDeltaTDampingCoeff", 0.2)
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);
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// Maximum change in cell temperature per iteration
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// (relative to previous value)
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scalar alphaTemp(pimpleDict.lookupOrDefault("alphaTemp", 0.05));
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Info<< "Time scales min/max:" << endl;
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// Cache old reciprocal time scale field
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volScalarField rDeltaT0("rDeltaT0", rDeltaT);
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// Flow time scale
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{
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rDeltaT.ref() =
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(
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fvc::surfaceSum(mag(phi))()()
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/((2*maxCo)*mesh.V()*rho())
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);
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// Limit the largest time scale
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rDeltaT.max(1/maxDeltaT);
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Info<< " Flow = "
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<< gMin(1/rDeltaT.primitiveField()) << ", "
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<< gMax(1/rDeltaT.primitiveField()) << endl;
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}
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// Reaction source time scale
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{
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volScalarField::Internal rDeltaTT
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(
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mag
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(
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parcels.hsTrans()/(mesh.V()*runTime.deltaT())
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+ Qdot
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)
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/(
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alphaTemp
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*rho()
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*thermo.Cp()()()
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*T()
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)
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);
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Info<< " Temperature = "
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<< gMin(1/(rDeltaTT.field() + VSMALL)) << ", "
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<< gMax(1/(rDeltaTT.field() + VSMALL)) << endl;
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rDeltaT.ref() = max
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(
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rDeltaT(),
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rDeltaTT
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);
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}
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// Update tho boundary values of the reciprocal time-step
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rDeltaT.correctBoundaryConditions();
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// Spatially smooth the time scale field
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if (rDeltaTSmoothingCoeff < 1.0)
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{
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fvc::smooth(rDeltaT, rDeltaTSmoothingCoeff);
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}
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// Limit rate of change of time scale
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// - reduce as much as required
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// - only increase at a fraction of old time scale
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if
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(
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rDeltaTDampingCoeff < 1.0
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&& runTime.timeIndex() > runTime.startTimeIndex() + 1
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)
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{
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rDeltaT = max
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(
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rDeltaT,
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(scalar(1.0) - rDeltaTDampingCoeff)*rDeltaT0
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);
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}
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Info<< " Overall = "
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<< gMin(1/rDeltaT.primitiveField())
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<< ", " << gMax(1/rDeltaT.primitiveField()) << endl;
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}
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// ************************************************************************* //
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