75ea76187b
When the GeometricBoundaryField template class was originally written it
was a separate class in the Foam namespace rather than a sub-class of
GeometricField as it is now. Without loss of clarity and simplifying
code which access the boundary field of GeometricFields it is better
that GeometricBoundaryField be renamed Boundary for consistency with the
new naming convention for the type of the dimensioned internal field:
Internal, see commit a25a449c9e
This is a very simple text substitution change which can be applied to
any code which compiles with the OpenFOAM-dev libraries.
717 lines
19 KiB
C
717 lines
19 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) 2013-2016 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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#include "multiphaseSystem.H"
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#include "alphaContactAngleFvPatchScalarField.H"
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#include "MULES.H"
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#include "subCycle.H"
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#include "fvcDdt.H"
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#include "fvcDiv.H"
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#include "fvcSnGrad.H"
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#include "fvcFlux.H"
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#include "fvcMeshPhi.H"
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#include "fvcSup.H"
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#include "fvmDdt.H"
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#include "fvmLaplacian.H"
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#include "fvmSup.H"
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// * * * * * * * * * * * * * * * Static Member Data * * * * * * * * * * * * //
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namespace Foam
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{
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defineTypeNameAndDebug(multiphaseSystem, 0);
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defineRunTimeSelectionTable(multiphaseSystem, dictionary);
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}
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const Foam::scalar Foam::multiphaseSystem::convertToRad =
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Foam::constant::mathematical::pi/180.0;
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// * * * * * * * * * * * * * Private Member Functions * * * * * * * * * * * //
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void Foam::multiphaseSystem::calcAlphas()
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{
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scalar level = 0.0;
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alphas_ == 0.0;
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forAll(phases(), i)
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{
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alphas_ += level*phases()[i];
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level += 1.0;
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}
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}
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void Foam::multiphaseSystem::solveAlphas()
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{
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bool LTS = fv::localEulerDdt::enabled(mesh_);
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PtrList<surfaceScalarField> alphaPhiCorrs(phases().size());
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forAll(phases(), phasei)
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{
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phaseModel& phase = phases()[phasei];
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volScalarField& alpha1 = phase;
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phase.alphaPhi() =
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dimensionedScalar("0", dimensionSet(0, 3, -1, 0, 0), 0);
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alphaPhiCorrs.set
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(
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phasei,
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new surfaceScalarField
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(
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"phi" + alpha1.name() + "Corr",
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fvc::flux
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(
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phi_,
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phase,
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"div(phi," + alpha1.name() + ')'
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)
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)
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);
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surfaceScalarField& alphaPhiCorr = alphaPhiCorrs[phasei];
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forAll(phases(), phasej)
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{
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phaseModel& phase2 = phases()[phasej];
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volScalarField& alpha2 = phase2;
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if (&phase2 == &phase) continue;
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surfaceScalarField phir(phase.phi() - phase2.phi());
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cAlphaTable::const_iterator cAlpha
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(
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cAlphas_.find(phasePairKey(phase.name(), phase2.name()))
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);
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if (cAlpha != cAlphas_.end())
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{
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surfaceScalarField phic
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(
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(mag(phi_) + mag(phir))/mesh_.magSf()
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);
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phir += min(cAlpha()*phic, max(phic))*nHatf(phase, phase2);
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}
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word phirScheme
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(
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"div(phir," + alpha2.name() + ',' + alpha1.name() + ')'
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);
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alphaPhiCorr += fvc::flux
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(
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-fvc::flux(-phir, phase2, phirScheme),
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phase,
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phirScheme
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);
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}
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surfaceScalarField::Boundary& alphaPhiCorrBf =
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alphaPhiCorr.boundaryFieldRef();
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// Ensure that the flux at inflow BCs is preserved
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forAll(alphaPhiCorr.boundaryField(), patchi)
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{
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fvsPatchScalarField& alphaPhiCorrp = alphaPhiCorrBf[patchi];
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if (!alphaPhiCorrp.coupled())
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{
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const scalarField& phi1p = phase.phi().boundaryField()[patchi];
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const scalarField& alpha1p = alpha1.boundaryField()[patchi];
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forAll(alphaPhiCorrp, facei)
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{
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if (phi1p[facei] < 0)
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{
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alphaPhiCorrp[facei] = alpha1p[facei]*phi1p[facei];
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}
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}
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}
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}
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if (LTS)
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{
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MULES::limit
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(
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fv::localEulerDdt::localRDeltaT(mesh_),
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geometricOneField(),
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phase,
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phi_,
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alphaPhiCorr,
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zeroField(),
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zeroField(),
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phase.alphaMax(),
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0,
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true
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);
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}
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else
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{
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const scalar rDeltaT = 1.0/mesh_.time().deltaTValue();
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MULES::limit
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(
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rDeltaT,
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geometricOneField(),
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phase,
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phi_,
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alphaPhiCorr,
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zeroField(),
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zeroField(),
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phase.alphaMax(),
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0,
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true
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);
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}
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}
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MULES::limitSum(alphaPhiCorrs);
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volScalarField sumAlpha
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(
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IOobject
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(
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"sumAlpha",
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mesh_.time().timeName(),
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mesh_
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),
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mesh_,
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dimensionedScalar("sumAlpha", dimless, 0)
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);
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volScalarField divU(fvc::div(fvc::absolute(phi_, phases().first().U())));
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forAll(phases(), phasei)
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{
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phaseModel& phase = phases()[phasei];
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volScalarField& alpha = phase;
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surfaceScalarField& alphaPhic = alphaPhiCorrs[phasei];
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alphaPhic += upwind<scalar>(mesh_, phi_).flux(phase);
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volScalarField::Internal Sp
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(
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IOobject
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(
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"Sp",
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mesh_.time().timeName(),
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mesh_
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),
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mesh_,
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dimensionedScalar("Sp", divU.dimensions(), 0.0)
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);
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volScalarField::Internal Su
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(
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IOobject
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(
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"Su",
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mesh_.time().timeName(),
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mesh_
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),
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// Divergence term is handled explicitly to be
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// consistent with the explicit transport solution
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divU*min(alpha, scalar(1))
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);
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if (phase.divU().valid())
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{
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const scalarField& dgdt = phase.divU()();
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forAll(dgdt, celli)
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{
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if (dgdt[celli] > 0.0)
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{
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Sp[celli] -= dgdt[celli];
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Su[celli] += dgdt[celli];
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}
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else if (dgdt[celli] < 0.0)
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{
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Sp[celli] +=
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dgdt[celli]
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*(1.0 - alpha[celli])/max(alpha[celli], 1e-4);
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}
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}
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}
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forAll(phases(), phasej)
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{
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const phaseModel& phase2 = phases()[phasej];
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const volScalarField& alpha2 = phase2;
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if (&phase2 == &phase) continue;
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if (phase2.divU().valid())
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{
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const scalarField& dgdt2 = phase2.divU()();
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forAll(dgdt2, celli)
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{
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if (dgdt2[celli] < 0.0)
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{
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Sp[celli] +=
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dgdt2[celli]
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*(1.0 - alpha2[celli])/max(alpha2[celli], 1e-4);
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Su[celli] -=
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dgdt2[celli]
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*alpha[celli]/max(alpha2[celli], 1e-4);
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}
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else if (dgdt2[celli] > 0.0)
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{
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Sp[celli] -= dgdt2[celli];
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}
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}
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}
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}
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MULES::explicitSolve
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(
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geometricOneField(),
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alpha,
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alphaPhic,
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Sp,
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Su
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);
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phase.alphaPhi() += alphaPhic;
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Info<< phase.name() << " volume fraction, min, max = "
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<< phase.weightedAverage(mesh_.V()).value()
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<< ' ' << min(phase).value()
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<< ' ' << max(phase).value()
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<< endl;
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sumAlpha += phase;
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}
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Info<< "Phase-sum volume fraction, min, max = "
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<< sumAlpha.weightedAverage(mesh_.V()).value()
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<< ' ' << min(sumAlpha).value()
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<< ' ' << max(sumAlpha).value()
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<< endl;
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}
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Foam::tmp<Foam::surfaceVectorField> Foam::multiphaseSystem::nHatfv
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(
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const volScalarField& alpha1,
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const volScalarField& alpha2
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) const
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{
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/*
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// Cell gradient of alpha
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volVectorField gradAlpha =
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alpha2*fvc::grad(alpha1) - alpha1*fvc::grad(alpha2);
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// Interpolated face-gradient of alpha
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surfaceVectorField gradAlphaf = fvc::interpolate(gradAlpha);
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*/
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surfaceVectorField gradAlphaf
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(
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fvc::interpolate(alpha2)*fvc::interpolate(fvc::grad(alpha1))
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- fvc::interpolate(alpha1)*fvc::interpolate(fvc::grad(alpha2))
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);
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// Face unit interface normal
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return gradAlphaf/(mag(gradAlphaf) + deltaN_);
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}
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Foam::tmp<Foam::surfaceScalarField> Foam::multiphaseSystem::nHatf
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(
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const volScalarField& alpha1,
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const volScalarField& alpha2
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) const
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{
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// Face unit interface normal flux
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return nHatfv(alpha1, alpha2) & mesh_.Sf();
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}
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// Correction for the boundary condition on the unit normal nHat on
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// walls to produce the correct contact angle.
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// The dynamic contact angle is calculated from the component of the
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// velocity on the direction of the interface, parallel to the wall.
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void Foam::multiphaseSystem::correctContactAngle
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(
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const phaseModel& phase1,
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const phaseModel& phase2,
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surfaceVectorField::Boundary& nHatb
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) const
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{
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const volScalarField::Boundary& gbf
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= phase1.boundaryField();
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const fvBoundaryMesh& boundary = mesh_.boundary();
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forAll(boundary, patchi)
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{
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if (isA<alphaContactAngleFvPatchScalarField>(gbf[patchi]))
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{
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const alphaContactAngleFvPatchScalarField& acap =
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refCast<const alphaContactAngleFvPatchScalarField>(gbf[patchi]);
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vectorField& nHatPatch = nHatb[patchi];
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vectorField AfHatPatch
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(
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mesh_.Sf().boundaryField()[patchi]
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/mesh_.magSf().boundaryField()[patchi]
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);
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alphaContactAngleFvPatchScalarField::thetaPropsTable::
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const_iterator tp =
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acap.thetaProps()
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.find(phasePairKey(phase1.name(), phase2.name()));
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if (tp == acap.thetaProps().end())
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{
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FatalErrorInFunction
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<< "Cannot find interface "
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<< phasePairKey(phase1.name(), phase2.name())
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<< "\n in table of theta properties for patch "
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<< acap.patch().name()
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<< exit(FatalError);
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}
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bool matched = (tp.key().first() == phase1.name());
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scalar theta0 = convertToRad*tp().theta0(matched);
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scalarField theta(boundary[patchi].size(), theta0);
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scalar uTheta = tp().uTheta();
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// Calculate the dynamic contact angle if required
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if (uTheta > SMALL)
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{
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scalar thetaA = convertToRad*tp().thetaA(matched);
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scalar thetaR = convertToRad*tp().thetaR(matched);
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// Calculated the component of the velocity parallel to the wall
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vectorField Uwall
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(
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phase1.U()().boundaryField()[patchi].patchInternalField()
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- phase1.U()().boundaryField()[patchi]
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);
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Uwall -= (AfHatPatch & Uwall)*AfHatPatch;
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// Find the direction of the interface parallel to the wall
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vectorField nWall
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(
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nHatPatch - (AfHatPatch & nHatPatch)*AfHatPatch
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);
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// Normalise nWall
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nWall /= (mag(nWall) + SMALL);
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// Calculate Uwall resolved normal to the interface parallel to
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// the interface
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scalarField uwall(nWall & Uwall);
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theta += (thetaA - thetaR)*tanh(uwall/uTheta);
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}
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// Reset nHatPatch to correspond to the contact angle
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scalarField a12(nHatPatch & AfHatPatch);
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scalarField b1(cos(theta));
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scalarField b2(nHatPatch.size());
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forAll(b2, facei)
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{
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b2[facei] = cos(acos(a12[facei]) - theta[facei]);
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}
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scalarField det(1.0 - a12*a12);
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scalarField a((b1 - a12*b2)/det);
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scalarField b((b2 - a12*b1)/det);
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nHatPatch = a*AfHatPatch + b*nHatPatch;
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nHatPatch /= (mag(nHatPatch) + deltaN_.value());
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}
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}
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}
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Foam::tmp<Foam::volScalarField> Foam::multiphaseSystem::K
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(
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const phaseModel& phase1,
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const phaseModel& phase2
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) const
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{
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tmp<surfaceVectorField> tnHatfv = nHatfv(phase1, phase2);
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correctContactAngle(phase1, phase2, tnHatfv.ref().boundaryFieldRef());
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// Simple expression for curvature
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return -fvc::div(tnHatfv & mesh_.Sf());
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}
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// * * * * * * * * * * * * * * * * Constructors * * * * * * * * * * * * * * //
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Foam::multiphaseSystem::multiphaseSystem
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(
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const fvMesh& mesh
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)
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:
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phaseSystem(mesh),
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alphas_
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(
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IOobject
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(
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"alphas",
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mesh_.time().timeName(),
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mesh,
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IOobject::NO_READ,
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IOobject::AUTO_WRITE
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),
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mesh,
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dimensionedScalar("alphas", dimless, 0.0)
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),
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cAlphas_(lookup("interfaceCompression")),
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deltaN_
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(
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"deltaN",
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1e-8/pow(average(mesh_.V()), 1.0/3.0)
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)
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{
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forAll(phases(), phasei)
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{
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volScalarField& alphai = phases()[phasei];
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mesh_.setFluxRequired(alphai.name());
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}
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}
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// * * * * * * * * * * * * * * * * Destructor * * * * * * * * * * * * * * * //
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|
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Foam::multiphaseSystem::~multiphaseSystem()
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{}
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|
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// * * * * * * * * * * * * * * Member Functions * * * * * * * * * * * * * * //
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|
|
Foam::tmp<Foam::surfaceScalarField> Foam::multiphaseSystem::surfaceTension
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|
(
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const phaseModel& phase1
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) const
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{
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tmp<surfaceScalarField> tSurfaceTension
|
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(
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new surfaceScalarField
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(
|
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IOobject
|
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(
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"surfaceTension",
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mesh_.time().timeName(),
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mesh_
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),
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mesh_,
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dimensionedScalar
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(
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"surfaceTension",
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dimensionSet(1, -2, -2, 0, 0),
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0
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)
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)
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);
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forAll(phases(), phasej)
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{
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const phaseModel& phase2 = phases()[phasej];
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if (&phase2 != &phase1)
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{
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phasePairKey key12(phase1.name(), phase2.name());
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cAlphaTable::const_iterator cAlpha(cAlphas_.find(key12));
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|
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if (cAlpha != cAlphas_.end())
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{
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tSurfaceTension.ref() +=
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fvc::interpolate(sigma(key12)*K(phase1, phase2))
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*(
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fvc::interpolate(phase2)*fvc::snGrad(phase1)
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- fvc::interpolate(phase1)*fvc::snGrad(phase2)
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);
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}
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}
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}
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return tSurfaceTension;
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}
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|
Foam::tmp<Foam::volScalarField>
|
|
Foam::multiphaseSystem::nearInterface() const
|
|
{
|
|
tmp<volScalarField> tnearInt
|
|
(
|
|
new volScalarField
|
|
(
|
|
IOobject
|
|
(
|
|
"nearInterface",
|
|
mesh_.time().timeName(),
|
|
mesh_
|
|
),
|
|
mesh_,
|
|
dimensionedScalar("nearInterface", dimless, 0.0)
|
|
)
|
|
);
|
|
|
|
forAll(phases(), phasei)
|
|
{
|
|
tnearInt.ref() = max
|
|
(
|
|
tnearInt(),
|
|
pos(phases()[phasei] - 0.01)*pos(0.99 - phases()[phasei])
|
|
);
|
|
}
|
|
|
|
return tnearInt;
|
|
}
|
|
|
|
|
|
void Foam::multiphaseSystem::solve()
|
|
{
|
|
const Time& runTime = mesh_.time();
|
|
|
|
const dictionary& alphaControls = mesh_.solverDict("alpha");
|
|
label nAlphaSubCycles(readLabel(alphaControls.lookup("nAlphaSubCycles")));
|
|
|
|
bool LTS = fv::localEulerDdt::enabled(mesh_);
|
|
|
|
if (nAlphaSubCycles > 1)
|
|
{
|
|
tmp<volScalarField> trSubDeltaT;
|
|
|
|
if (LTS)
|
|
{
|
|
trSubDeltaT =
|
|
fv::localEulerDdt::localRSubDeltaT(mesh_, nAlphaSubCycles);
|
|
}
|
|
|
|
PtrList<volScalarField> alpha0s(phases().size());
|
|
PtrList<surfaceScalarField> alphaPhiSums(phases().size());
|
|
|
|
forAll(phases(), phasei)
|
|
{
|
|
phaseModel& phase = phases()[phasei];
|
|
volScalarField& alpha = phase;
|
|
|
|
alpha0s.set
|
|
(
|
|
phasei,
|
|
new volScalarField(alpha.oldTime())
|
|
);
|
|
|
|
alphaPhiSums.set
|
|
(
|
|
phasei,
|
|
new surfaceScalarField
|
|
(
|
|
IOobject
|
|
(
|
|
"phiSum" + alpha.name(),
|
|
runTime.timeName(),
|
|
mesh_
|
|
),
|
|
mesh_,
|
|
dimensionedScalar("0", dimensionSet(0, 3, -1, 0, 0), 0)
|
|
)
|
|
);
|
|
}
|
|
|
|
for
|
|
(
|
|
subCycleTime alphaSubCycle
|
|
(
|
|
const_cast<Time&>(runTime),
|
|
nAlphaSubCycles
|
|
);
|
|
!(++alphaSubCycle).end();
|
|
)
|
|
{
|
|
solveAlphas();
|
|
|
|
forAll(phases(), phasei)
|
|
{
|
|
alphaPhiSums[phasei] += phases()[phasei].alphaPhi();
|
|
}
|
|
}
|
|
|
|
forAll(phases(), phasei)
|
|
{
|
|
phaseModel& phase = phases()[phasei];
|
|
volScalarField& alpha = phase;
|
|
|
|
phase.alphaPhi() = alphaPhiSums[phasei]/nAlphaSubCycles;
|
|
|
|
// Correct the time index of the field
|
|
// to correspond to the global time
|
|
alpha.timeIndex() = runTime.timeIndex();
|
|
|
|
// Reset the old-time field value
|
|
alpha.oldTime() = alpha0s[phasei];
|
|
alpha.oldTime().timeIndex() = runTime.timeIndex();
|
|
}
|
|
}
|
|
else
|
|
{
|
|
solveAlphas();
|
|
}
|
|
|
|
forAll(phases(), phasei)
|
|
{
|
|
phaseModel& phase = phases()[phasei];
|
|
phase.alphaRhoPhi() = fvc::interpolate(phase.rho())*phase.alphaPhi();
|
|
}
|
|
|
|
calcAlphas();
|
|
}
|
|
|
|
|
|
// ************************************************************************* //
|