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.
102 lines
2.9 KiB
C
102 lines
2.9 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) 2014-2017 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 "IshiiZuber.H"
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#include "phasePair.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(IshiiZuber, 0);
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addToRunTimeSelectionTable(dragModel, IshiiZuber, dictionary);
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}
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}
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// * * * * * * * * * * * * * * * * Constructors * * * * * * * * * * * * * * //
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Foam::dragModels::IshiiZuber::IshiiZuber
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(
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const dictionary& dict,
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const phasePair& pair,
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const bool registerObject
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)
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:
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dragModel(dict, pair, registerObject)
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{}
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// * * * * * * * * * * * * * * * * Destructor * * * * * * * * * * * * * * * //
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Foam::dragModels::IshiiZuber::~IshiiZuber()
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{}
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// * * * * * * * * * * * * * * * Member Functions * * * * * * * * * * * * * //
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Foam::tmp<Foam::volScalarField>
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Foam::dragModels::IshiiZuber::CdRe() const
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{
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volScalarField Re(pair_.Re());
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volScalarField Eo(pair_.Eo());
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volScalarField mud(pair_.dispersed().mu());
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volScalarField muc(pair_.continuous().mu());
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volScalarField muStar((mud + 0.4*muc)/(mud + muc));
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volScalarField muMix
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(
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muc
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*pow(max(1 - pair_.dispersed(), scalar(1e-3)), -2.5*muStar)
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);
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volScalarField ReM(Re*muc/muMix);
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volScalarField CdRe
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(
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pos0(1000 - ReM)*24.0*(scalar(1) + 0.15*pow(ReM, 0.687))
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+ neg(1000 - ReM)*0.44*ReM
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);
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volScalarField F((muc/muMix)*sqrt(1 - pair_.dispersed()));
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F.max(1e-3);
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volScalarField Ealpha((1 + 17.67*pow(F, 0.8571428))/(18.67*F));
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volScalarField CdReEllipse(Ealpha*0.6666*sqrt(Eo)*Re);
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return
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pos0(CdReEllipse - CdRe)
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*min(CdReEllipse, Re*sqr(1 - pair_.dispersed())*2.66667)
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+ neg(CdReEllipse - CdRe)*CdRe;
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}
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// ************************************************************************* //
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