ad476af9b3
Added the interfacial pressure-work terms according to: Ishii, M., Hibiki, T., Thermo-fluid dynamics of two-phase flow, ISBN-10: 0-387-28321-8, 2006 While this is the most common approach to handling the interfacial pressure-work it introduces numerical stability issues in regions of low phase-fraction and rapid flow deformation. To alleviate this problem an optional limiter may be applied to the pressure-work term in either of the energy forms. This may specified in the "thermophysicalProperties.<phase>" file, e.g. pressureWorkAlphaLimit 1e-3; which sets the pressure work term to 0 for phase-fractions below 1e-3. For particularly unstable cases a limit of 1e-2 may be necessary.
175 lines
4.6 KiB
C
175 lines
4.6 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) 2015-2016 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 "AnisothermalPhaseModel.H"
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#include "phaseSystem.H"
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// * * * * * * * * * * * * * * * * Constructors * * * * * * * * * * * * * * //
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template<class BasePhaseModel>
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Foam::AnisothermalPhaseModel<BasePhaseModel>::AnisothermalPhaseModel
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(
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const phaseSystem& fluid,
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const word& phaseName,
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const label index
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)
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:
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BasePhaseModel(fluid, phaseName, index),
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K_
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(
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IOobject
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(
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IOobject::groupName("K", this->name()),
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fluid.mesh().time().timeName(),
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fluid.mesh()
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),
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fluid.mesh(),
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dimensionedScalar("K", sqr(dimVelocity), scalar(0))
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)
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{}
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// * * * * * * * * * * * * * * * * Destructor * * * * * * * * * * * * * * * //
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template<class BasePhaseModel>
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Foam::AnisothermalPhaseModel<BasePhaseModel>::~AnisothermalPhaseModel()
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{}
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// * * * * * * * * * * * * * * * Member Functions * * * * * * * * * * * * * //
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template<class BasePhaseModel>
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void Foam::AnisothermalPhaseModel<BasePhaseModel>::correctKinematics()
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{
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BasePhaseModel::correctKinematics();
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K_ = 0.5*magSqr(this->U());
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}
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template<class BasePhaseModel>
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void Foam::AnisothermalPhaseModel<BasePhaseModel>::correctThermo()
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{
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BasePhaseModel::correctThermo();
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this->thermo_->correct();
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}
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template<class BasePhaseModel>
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Foam::tmp<Foam::volScalarField>
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Foam::AnisothermalPhaseModel<BasePhaseModel>::filterPressureWork
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(
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const tmp<volScalarField>& pressureWork
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) const
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{
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const volScalarField& alpha = *this;
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scalar pressureWorkAlphaLimit =
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this->thermo_->lookupOrDefault("pressureWorkAlphaLimit", 0.0);
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if (pressureWorkAlphaLimit > 0)
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{
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return
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(
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max(alpha - pressureWorkAlphaLimit, scalar(0))
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/max(alpha - pressureWorkAlphaLimit, pressureWorkAlphaLimit)
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)*pressureWork;
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}
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else
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{
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return pressureWork;
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}
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}
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template<class BasePhaseModel>
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Foam::tmp<Foam::fvScalarMatrix>
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Foam::AnisothermalPhaseModel<BasePhaseModel>::heEqn()
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{
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const volScalarField& alpha = *this;
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const volVectorField& U = this->U();
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const surfaceScalarField& alphaPhi = this->alphaPhi();
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const surfaceScalarField& alphaRhoPhi = this->alphaRhoPhi();
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const volScalarField& contErr(this->continuityError());
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const volScalarField alphaEff(this->turbulence().alphaEff());
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volScalarField& he = this->thermo_->he();
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tmp<fvScalarMatrix> tEEqn
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(
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fvm::ddt(alpha, this->rho(), he)
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+ fvm::div(alphaRhoPhi, he)
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- fvm::Sp(contErr, he)
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+ fvc::ddt(alpha, this->rho(), K_) + fvc::div(alphaRhoPhi, K_)
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- contErr*K_
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- fvm::laplacian
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(
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fvc::interpolate(alpha)
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*fvc::interpolate(alphaEff),
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he
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)
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==
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this->Sh()
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);
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// Add the appropriate pressure-work term
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if (he.name() == this->thermo_->phasePropertyName("e"))
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{
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tEEqn.ref() += filterPressureWork
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(
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fvc::div(fvc::absolute(alphaPhi, alpha, U), this->thermo().p())
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+ this->thermo().p()*fvc::ddt(alpha)
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);
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}
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else if (this->thermo_->dpdt())
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{
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tEEqn.ref() -= filterPressureWork(alpha*this->fluid().dpdt());
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}
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return tEEqn;
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}
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template<class BasePhaseModel>
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bool Foam::AnisothermalPhaseModel<BasePhaseModel>::compressible() const
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{
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return !this->thermo().incompressible();
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}
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template<class BasePhaseModel>
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const Foam::volScalarField&
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Foam::AnisothermalPhaseModel<BasePhaseModel>::K() const
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{
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return K_;
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}
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// ************************************************************************* //
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