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145 lines
3.8 KiB
C
145 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 |
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\\ / A nd | www.openfoam.com
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\\/ M anipulation |
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-------------------------------------------------------------------------------
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Copyright (C) 2015 OpenFOAM Foundation
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Copyright (C) 2015 OpenCFD Ltd.
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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 "velocityDampingConstraint.H"
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#include "addToRunTimeSelectionTable.H"
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#include "fvMatrix.H"
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#include "volFields.H"
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// * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //
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namespace Foam
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{
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namespace fv
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{
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defineTypeNameAndDebug(velocityDampingConstraint, 0);
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addToRunTimeSelectionTable
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(
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option,
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velocityDampingConstraint,
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dictionary
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);
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}
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}
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// * * * * * * * * * * * * * Private Member Functions * * * * * * * * * * * //
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void Foam::fv::velocityDampingConstraint::addDamping(fvMatrix<vector>& eqn)
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{
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// Note: we want to add
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// deltaU/deltaT
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// where deltaT is a local time scale:
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// U/(cbrt of volume)
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// Since directly manipulating the diagonal we multiply by volume.
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const scalarField& vol = mesh_.V();
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const volVectorField& U = eqn.psi();
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scalarField& diag = eqn.diag();
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label nDamped = 0;
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forAll(U, cellI)
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{
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const scalar magU = mag(U[cellI]);
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if (magU > UMax_)
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{
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const scalar scale = sqr(Foam::cbrt(vol[cellI]));
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diag[cellI] += scale*(magU-UMax_);
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++nDamped;
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}
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}
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reduce(nDamped, sumOp<label>());
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Info<< type() << " " << name_ << " damped "
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<< nDamped << " ("
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<< 100*scalar(nDamped)/mesh_.globalData().nTotalCells()
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<< "%) of cells" << endl;
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}
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// * * * * * * * * * * * * * * * * Constructors * * * * * * * * * * * * * * //
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Foam::fv::velocityDampingConstraint::velocityDampingConstraint
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(
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const word& name,
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const word& modelType,
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const dictionary& dict,
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const fvMesh& mesh
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)
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:
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cellSetOption(name, modelType, dict, mesh)
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{
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read(dict);
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}
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// * * * * * * * * * * * * * * * Member Functions * * * * * * * * * * * * * //
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void Foam::fv::velocityDampingConstraint::constrain
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(
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fvMatrix<vector>& eqn,
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const label fieldi
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)
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{
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addDamping(eqn);
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}
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void Foam::fv::velocityDampingConstraint::writeData(Ostream& os) const
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{
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dict_.writeEntry(name_, os);
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}
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bool Foam::fv::velocityDampingConstraint::read(const dictionary& dict)
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{
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if (cellSetOption::read(dict))
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{
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coeffs_.readEntry("UMax", UMax_);
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if (!coeffs_.readIfPresent("UNames", fieldNames_))
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{
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fieldNames_.resize(1);
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fieldNames_.first() = coeffs_.getOrDefault<word>("U", "U");
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}
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applied_.setSize(fieldNames_.size(), false);
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return true;
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}
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return false;
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}
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// ************************************************************************* //
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