Tenneti.C

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    Copyright (C) 2016-2018 OpenFOAM Foundation
-------------------------------------------------------------------------------
License
    This file is part of OpenFOAM.
 
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#include "Tenneti.H"
#include "phasePair.H"
#include "SchillerNaumann.H"
#include "addToRunTimeSelectionTable.H"
 
// * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //
 
namespace Foam
{
namespace dragModels
{
    defineTypeNameAndDebug(Tenneti, 0);
    addToRunTimeSelectionTable(dragModel, Tenneti, dictionary);
}
}
 
 
// * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //
 
Foam::dragModels::Tenneti::Tenneti
(
    const dictionary& dict,
    const phasePair& pair,
    const bool registerObject
)
:
    dragModel(dict, pair, registerObject),
    residualRe_("residualRe", dimless, dict)
{}
 
 
// * * * * * * * * * * * * * * * * Destructor  * * * * * * * * * * * * * * * //
 
Foam::dragModels::Tenneti::~Tenneti()
{}
 
 
// * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //
 
Foam::tmp<Foam::volScalarField> Foam::dragModels::Tenneti::CdRe() const
{
    volScalarField alpha1
    (
        max(pair_.dispersed(), pair_.continuous().residualAlpha())
    );
 
    volScalarField alpha2
    (
        max(scalar(1) - pair_.dispersed(), pair_.continuous().residualAlpha())
    );
 
    volScalarField Res(alpha2*pair_.Re());
 
    volScalarField CdReIsolated
    (
        neg(Res - 1000)*24*(1 + 0.15*pow(Res, 0.687))
      + pos0(Res - 1000)*0.44*max(Res, residualRe_)
    );
 
    volScalarField F0
    (
        5.81*alpha1/pow3(alpha2) + 0.48*cbrt(alpha1)/pow4(alpha2)
    );
 
    volScalarField F1
    (
        pow3(alpha1)*Res*(0.95 + 0.61*pow3(alpha1)/sqr(alpha2))
    );
 
    // Tenneti et al. correlation includes the mean pressure drag.
    // This was removed here by multiplying F by alpha2 for consistency with
    // the formulation used in OpenFOAM
    return
        CdReIsolated + 24*sqr(alpha2)*(F0 + F1);
}
 
 
// ************************************************************************* //