a5ea0b41f1
The interface for fvModels has been modified to improve its application
to "proxy" equations. That is, equations that are not straightforward
statements of conservation laws in OpenFOAM's usual convention.
A standard conservation law typically takes the following form:
fvMatrix<scalar> psiEqn
(
fvm::ddt(alpha, rho, psi)
+ <fluxes>
==
<sources>
);
A proxy equation, on the other hand, may be a derivation or
rearrangement of a law like this, and may be linearised in terms of a
different variable.
The pressure equation is the most common example of a proxy equation. It
represents a statement of the conservation of volume or mass, but it is
a rearrangement of the original continuity equation, and it has been
linearised in terms of a different variable; the pressure. Another
example is that in the pre-predictor of a VoF solver the
phase-continuity equation is constructed, but it is linearised in terms
of volume fraction rather than density.
In these situations, fvModels sources are now applied by calling:
fvModels().sourceProxy(<conserved-fields ...>, <equation-field>)
Where <conserved-fields ...> are (alpha, rho, psi), (rho, psi), just
(psi), or are omitted entirely (for volume continuity), and the
<equation-field> is the field associated with the proxy equation. This
produces a source term identical in value to the following call:
fvModels().source(<conserved-fields ...>)
It is only the linearisation in terms of <equation-field> that differs
between these two calls.
This change permits much greater flexibility in the handling of mass and
volume sources than the previous name-based system did. All the relevant
fields are available, dimensions can be used in the logic to determine
what sources are being constructed, and sources relating to a given
conservation law all share the same function.
This commit adds the functionality for injection-type sources in the
compressibleVoF solver. A following commit will add a volume source
model for use in incompressible solvers.
124 lines
3.8 KiB
C++
124 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 | Website: https://openfoam.org
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\\ / A nd | Copyright (C) 2022-2023 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 "multiphaseEuler.H"
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#include "fvcDdt.H"
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#include "fvcDiv.H"
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#include "fvcSup.H"
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#include "fvmDdt.H"
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#include "fvmDiv.H"
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#include "fvmSup.H"
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// * * * * * * * * * * * * Private Member Functions * * * * * * * * * * * * //
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Foam::PtrList<Foam::fvScalarMatrix>
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Foam::solvers::multiphaseEuler::compressibilityEqns
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(
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const PtrList<volScalarField>& dmdts,
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const PtrList<volScalarField>& d2mdtdps
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) const
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{
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PtrList<fvScalarMatrix> pEqnComps(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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const volScalarField& alpha = phase;
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volScalarField& rho = phase.rho();
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pEqnComps.set(phasei, new fvScalarMatrix(p_rgh, dimVolume/dimTime));
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fvScalarMatrix& pEqnComp = pEqnComps[phasei];
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// Density variation
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if (!phase.isochoric() || !phase.pure())
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{
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pEqnComp +=
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(
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fvc::ddt(alpha, rho) + fvc::div(phase.alphaRhoPhi())
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- fvc::Sp(fvc::ddt(alpha) + fvc::div(phase.alphaPhi()), rho)
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)/rho;
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}
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// Mesh dilatation correction
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if (mesh.moving())
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{
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pEqnComp += fvc::div(mesh.phi())*alpha;
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}
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// Compressibility
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if (!phase.incompressible())
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{
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if (pimple.transonic())
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{
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const surfaceScalarField phid
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(
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IOobject::groupName("phid", phase.name()),
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fvc::interpolate(phase.thermo().psi())*phase.phi()
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);
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pEqnComp +=
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correction
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(
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(alpha/rho)*
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(
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phase.thermo().psi()*fvm::ddt(p_rgh)
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+ fvm::div(phid, p_rgh)
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- fvm::Sp(fvc::div(phid), p_rgh)
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)
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);
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pEqnComps[phasei].relax();
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}
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else
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{
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pEqnComp +=
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(alpha*phase.thermo().psi()/rho)
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*correction(fvm::ddt(p_rgh));
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}
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}
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// Option sources
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if (fvModels().addsSupToField(rho.name()))
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{
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pEqnComp -= fvModels().sourceProxy(alpha, rho, p_rgh)/rho;
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}
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// Mass transfer
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if (dmdts.set(phasei))
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{
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pEqnComp -= dmdts[phasei]/rho;
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}
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if (d2mdtdps.set(phasei))
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{
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pEqnComp -= correction(fvm::Sp(d2mdtdps[phasei]/rho, p_rgh));
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}
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}
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return pEqnComps;
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}
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// ************************************************************************* //
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