fc2ce73723
The boundary conditions of HbyA are now constrained by the new "constrainHbyA"
function which applies the velocity boundary values for patches for which the
velocity cannot be modified by assignment and pressure extrapolation is
not specified via the new
"fixedFluxExtrapolatedPressureFvPatchScalarField".
The new function "constrainPressure" sets the pressure gradient
appropriately for "fixedFluxPressureFvPatchScalarField" and
"fixedFluxExtrapolatedPressureFvPatchScalarField" boundary conditions to
ensure the evaluated flux corresponds to the known velocity values at
the boundary.
The "fixedFluxPressureFvPatchScalarField" boundary condition operates
exactly as before, ensuring the correct flux at fixed-flux boundaries by
compensating for the body forces (gravity in particular) with the
pressure gradient.
The new "fixedFluxExtrapolatedPressureFvPatchScalarField" boundary
condition may be used for cases with or without body-forces to set the
pressure gradient to compensate not only for the body-force but also the
extrapolated "HbyA" which provides a second-order boundary condition for
pressure. This is useful for a range a problems including impinging
flow, extrapolated inlet conditions with body-forces or for highly
viscous flows, pressure-induced separation etc. To test this boundary
condition at walls in the motorBike tutorial case set
lowerWall
{
type fixedFluxExtrapolatedPressure;
}
motorBikeGroup
{
type fixedFluxExtrapolatedPressure;
}
Currently the new extrapolated pressure boundary condition is supported
for all incompressible and sub-sonic compressible solvers except those
providing implicit and tensorial porosity support. The approach will be
extended to cover these solvers and options in the future.
Note: the extrapolated pressure boundary condition is experimental and
requires further testing to assess the range of applicability,
stability, accuracy etc.
Henry G. Weller
CFD Direct Ltd.
111 lines
3.2 KiB
C
111 lines
3.2 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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Application
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compressibleMultiphaseInterFoam
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Description
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Solver for n compressible, non-isothermal immiscible fluids using a VOF
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(volume of fluid) phase-fraction based interface capturing approach.
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The momentum and other fluid properties are of the "mixture" and a single
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momentum equation is solved.
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Turbulence modelling is generic, i.e. laminar, RAS or LES may be selected.
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\*---------------------------------------------------------------------------*/
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#include "fvCFD.H"
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#include "multiphaseMixtureThermo.H"
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#include "turbulentFluidThermoModel.H"
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#include "pimpleControl.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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pimpleControl pimple(mesh);
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#include "createTimeControls.H"
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#include "createFields.H"
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#include "CourantNo.H"
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#include "setInitialDeltaT.H"
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turbulence->validate();
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// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
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Info<< "\nStarting time loop\n" << endl;
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while (runTime.run())
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{
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#include "createTimeControls.H"
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#include "CourantNo.H"
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#include "alphaCourantNo.H"
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#include "setDeltaT.H"
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runTime++;
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Info<< "Time = " << runTime.timeName() << nl << endl;
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// --- Pressure-velocity PIMPLE corrector loop
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while (pimple.loop())
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{
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mixture.solve();
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solve(fvm::ddt(rho) + fvc::div(mixture.rhoPhi()));
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#include "UEqn.H"
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#include "TEqn.H"
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// --- Pressure corrector loop
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while (pimple.correct())
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{
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#include "pEqn.H"
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}
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if (pimple.turbCorr())
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{
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turbulence->correct();
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}
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}
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runTime.write();
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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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