16ea621887
The rewrite enables multiple pressure/velocity systems to be treated in a time and under-relaxation consistent way (useful for multiphase flows).
167 lines
4.9 KiB
C
167 lines
4.9 KiB
C
/*---------------------------------------------------------------------------*\
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========= |
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\\ / F ield | foam-extend: Open Source CFD
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\\ / O peration | Version: 4.0
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\\ / A nd | Web: http://www.foam-extend.org
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\\/ M anipulation | For copyright notice see file Copyright
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-------------------------------------------------------------------------------
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License
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This file is part of foam-extend.
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foam-extend 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 the
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Free Software Foundation, either version 3 of the License, or (at your
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option) any later version.
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foam-extend is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License 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 foam-extend. If not, see <http://www.gnu.org/licenses/>.
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Application
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channelFoam
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Description
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Incompressible LES solver for flow in a channel.
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Consistent formulation without time-step and relaxation dependence by
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Jasak and Tukovic.
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Author
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Hrvoje Jasak, Wikki Ltd. All rights reserved
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\*---------------------------------------------------------------------------*/
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#include "fvCFD.H"
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#include "singlePhaseTransportModel.H"
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#include "LESModel.H"
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#include "IFstream.H"
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#include "OFstream.H"
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#include "Random.H"
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#include "pisoControl.H"
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// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
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int main(int argc, char *argv[])
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{
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#include "setRootCase.H"
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#include "createTime.H"
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#include "createMesh.H"
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pisoControl piso(mesh);
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#include "readTransportProperties.H"
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#include "createFields.H"
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#include "initContinuityErrs.H"
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#include "createGradP.H"
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Info<< "\nStarting time loop\n" << endl;
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while (runTime.loop())
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{
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Info<< "Time = " << runTime.timeName() << nl << endl;
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#include "CourantNo.H"
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sgsModel->correct();
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// Time derivative matrix
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fvVectorMatrix ddtUEqn(fvm::ddt(U));
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// Convection-diffusion matrix
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fvVectorMatrix HUEqn
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(
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fvm::div(phi, U)
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+ sgsModel->divDevBeff()
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==
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flowDirection*gradP
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);
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if (piso.momentumPredictor())
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{
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solve(ddtUEqn + HUEqn == -fvc::grad(p));
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}
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// Prepare clean 1/a_p without time derivative contribution
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volScalarField rAU = 1.0/HUEqn.A();
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// --- PISO loop
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while (piso.correct())
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{
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// Calculate U from convection-diffusion matrix
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U = rAU*HUEqn.H();
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// Consistently calculate flux
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piso.calcTransientConsistentFlux(phi, U, rAU, ddtUEqn);
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adjustPhi(phi, U, p);
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while (piso.correctNonOrthogonal())
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{
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fvScalarMatrix pEqn
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(
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fvm::laplacian
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(
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fvc::interpolate(rAU)/piso.aCoeff(U.name()),
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p,
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"laplacian(rAU," + p.name() + ')'
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)
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==
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fvc::div(phi)
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);
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pEqn.setReference(pRefCell, pRefValue);
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pEqn.solve
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(
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mesh.solutionDict().solver(p.select(piso.finalInnerIter()))
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);
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if (piso.finalNonOrthogonalIter())
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{
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phi -= pEqn.flux();
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}
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}
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# include "continuityErrs.H"
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// Consistently reconstruct velocity after pressure equation
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piso.reconstructTransientVelocity(U, phi, ddtUEqn, rAU, p);
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}
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// Correct driving force for a constant mass flow rate
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// Extract the velocity in the flow direction
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dimensionedScalar magUbarStar =
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(flowDirection & U)().weightedAverage(mesh.V());
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// Calculate the pressure gradient increment needed to
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// adjust the average flow-rate to the correct value
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dimensionedScalar gragPplus =
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(magUbar - magUbarStar)/rAU.weightedAverage(mesh.V());
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U += gragPplus*rAU*flowDirection;
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gradP += gragPplus;
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Info<< "Uncorrected Ubar = " << magUbarStar.value() << tab
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<< "pressure gradient = " << gradP.value() << endl;
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runTime.write();
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#include "writeGradP.H"
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Info<< "ExecutionTime = " << runTime.elapsedCpuTime() << " s"
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<< " ClockTime = " << runTime.elapsedClockTime() << " s"
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<< nl << endl;
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}
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Info<< "End\n" << endl;
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return 0;
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}
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// ************************************************************************* //
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