109 lines
3.1 KiB
C
109 lines
3.1 KiB
C
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/*---------------------------------------------------------------------------*\
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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 held by original author
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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 the
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Free Software Foundation; either version 2 of the License, or (at your
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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, write to the Free Software Foundation,
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Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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\*---------------------------------------------------------------------------*/
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#include "GidaspowErgunWenYu.H"
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#include "addToRunTimeSelectionTable.H"
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// * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //
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namespace Foam
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{
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defineTypeNameAndDebug(GidaspowErgunWenYu, 0);
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addToRunTimeSelectionTable
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(
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dragModel,
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GidaspowErgunWenYu,
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dictionary
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);
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}
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// * * * * * * * * * * * * * * * * Constructors * * * * * * * * * * * * * * //
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Foam::GidaspowErgunWenYu::GidaspowErgunWenYu
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(
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const dictionary& interfaceDict,
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const volScalarField& alpha,
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const phaseModel& phasea,
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const phaseModel& phaseb
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)
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:
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dragModel(interfaceDict, alpha, phasea, phaseb)
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{}
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// * * * * * * * * * * * * * * * * Destructor * * * * * * * * * * * * * * * //
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Foam::GidaspowErgunWenYu::~GidaspowErgunWenYu()
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{}
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// * * * * * * * * * * * * * * * Member Functions * * * * * * * * * * * * * //
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Foam::tmp<Foam::volScalarField> Foam::GidaspowErgunWenYu::K
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(
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const volScalarField& Ur
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) const
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{
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volScalarField beta = max(scalar(1) - alpha_, scalar(1.0e-6));
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volScalarField bp = pow(beta, -2.65);
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volScalarField Re = max(Ur*phasea_.d()/phaseb_.nu(), scalar(1.0e-3));
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volScalarField Cds = 24.0*(1.0 + 0.15*pow(Re, 0.687))/Re;
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forAll(Re, celli)
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{
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if(Re[celli] > 1000.0)
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{
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Cds[celli] = 0.44;
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}
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}
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// Wen and Yu (1966)
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tmp<volScalarField> tKWenYu = 0.75*Cds*phaseb_.rho()*Ur*bp/phasea_.d();
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volScalarField& KWenYu = tKWenYu();
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// Ergun
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forAll (beta, cellj)
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{
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if (beta[cellj] <= 0.8)
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{
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KWenYu[cellj] =
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150.0*alpha_[cellj]*phaseb_.nu().value()*phaseb_.rho().value()
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/sqr(beta[cellj]*phasea_.d().value())
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+ 1.75*phaseb_.rho().value()*Ur[cellj]
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/(beta[cellj]*phasea_.d().value());
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}
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}
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return tKWenYu;
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}
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// ************************************************************************* //
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