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.
151 lines
4.3 KiB
C++
151 lines
4.3 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) 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 "twoPhaseSolver.H"
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#include "constrainHbyA.H"
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#include "constrainPressure.H"
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#include "adjustPhi.H"
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#include "findRefCell.H"
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#include "fvcMeshPhi.H"
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#include "fvcFlux.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 "fvcReconstruct.H"
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#include "fvmLaplacian.H"
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// * * * * * * * * * * * * * * Member Functions * * * * * * * * * * * * * * //
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void Foam::solvers::twoPhaseSolver::incompressiblePressureCorrector
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(
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volScalarField& p
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)
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{
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volVectorField& U = U_;
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surfaceScalarField& phi(phi_);
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fvVectorMatrix& UEqn = tUEqn.ref();
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setrAU(UEqn);
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const surfaceScalarField rAUf("rAUf", fvc::interpolate(rAU()));
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while (pimple.correct())
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{
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volVectorField HbyA(constrainHbyA(rAU()*UEqn.H(), U, p_rgh));
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surfaceScalarField phiHbyA
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(
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"phiHbyA",
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fvc::flux(HbyA)
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+ fvc::interpolate(rho*rAU())*fvc::ddtCorr(U, phi, Uf)
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);
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MRF.makeRelative(phiHbyA);
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if (p_rgh.needReference())
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{
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fvc::makeRelative(phiHbyA, U);
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adjustPhi(phiHbyA, U, p_rgh);
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fvc::makeAbsolute(phiHbyA, U);
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}
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surfaceScalarField phig
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(
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(
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surfaceTensionForce()
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- buoyancy.ghf*fvc::snGrad(rho)
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)*rAUf*mesh.magSf()
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);
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phiHbyA += phig;
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// Update the pressure BCs to ensure flux consistency
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constrainPressure(p_rgh, U, phiHbyA, rAUf, MRF);
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// Cache any sources
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fvScalarMatrix p_rghEqnSource
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(
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fvModels().sourceProxy(alpha1, p_rgh)
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+ fvModels().sourceProxy(alpha2, p_rgh)
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);
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while (pimple.correctNonOrthogonal())
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{
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fvScalarMatrix p_rghEqn
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(
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fvc::div(phiHbyA) - fvm::laplacian(rAUf, p_rgh)
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== p_rghEqnSource
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);
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p_rghEqn.setReference
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(
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pressureReference().refCell(),
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getRefCellValue(p_rgh, pressureReference().refCell())
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);
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p_rghEqn.solve();
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if (pimple.finalNonOrthogonalIter())
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{
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phi = phiHbyA + p_rghEqn.flux();
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p_rgh.relax();
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U = HbyA
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+ rAU()*fvc::reconstruct((phig + p_rghEqn.flux())/rAUf);
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U.correctBoundaryConditions();
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fvConstraints().constrain(U);
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}
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}
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continuityErrors();
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// Correct Uf if the mesh is moving
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fvc::correctUf(Uf, U, phi, MRF);
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// Make the fluxes relative to the mesh motion
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fvc::makeRelative(phi, U);
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p == p_rgh + rho*buoyancy.gh;
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if (p_rgh.needReference())
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{
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p += dimensionedScalar
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(
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"p",
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p.dimensions(),
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pressureReference().refValue()
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- getRefCellValue(p, pressureReference().refCell())
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);
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p_rgh = p - rho*buoyancy.gh;
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}
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}
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clearrAU();
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tUEqn.clear();
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}
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// ************************************************************************* //
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