56bfc75949
"pos" now returns 1 if the argument is greater than 0, otherwise it returns 0. This is consistent with the common mathematical definition of the "pos" function: https://en.wikipedia.org/wiki/Sign_(mathematics) However the previous implementation in which 1 was also returned for a 0 argument is useful in many situations so the "pos0" has been added which returns 1 if the argument is greater or equal to 0. Additionally the "neg0" has been added which returns 1 if if the argument is less than or equal to 0.
88 lines
2.6 KiB
C
88 lines
2.6 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) 2011-2017 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 "GidaspowSchillerNaumann.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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namespace dragModels
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{
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defineTypeNameAndDebug(GidaspowSchillerNaumann, 0);
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addToRunTimeSelectionTable
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(
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dragModel,
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GidaspowSchillerNaumann,
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dictionary
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);
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}
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}
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// * * * * * * * * * * * * * * * * Constructors * * * * * * * * * * * * * * //
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Foam::dragModels::GidaspowSchillerNaumann::GidaspowSchillerNaumann
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(
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const dictionary& interfaceDict,
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const phaseModel& phase1,
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const phaseModel& phase2
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)
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:
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dragModel(interfaceDict, phase1, phase2)
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{}
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// * * * * * * * * * * * * * * * * Destructor * * * * * * * * * * * * * * * //
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Foam::dragModels::GidaspowSchillerNaumann::~GidaspowSchillerNaumann()
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{}
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// * * * * * * * * * * * * * * * Member Functions * * * * * * * * * * * * * //
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Foam::tmp<Foam::volScalarField> Foam::dragModels::GidaspowSchillerNaumann::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 alpha2(max(phase2_, scalar(1e-6)));
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volScalarField bp(pow(alpha2, -2.65));
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volScalarField Re(max(alpha2*Ur*phase1_.d()/phase2_.nu(), scalar(1.0e-3)));
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volScalarField Cds
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(
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neg(Re - 1000)*(24.0*(1.0 + 0.15*pow(Re, 0.687))/Re)
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+ pos0(Re - 1000)*0.44
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);
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return 0.75*Cds*phase2_.rho()*Ur*bp/phase1_.d();
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}
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// ************************************************************************* //
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