Ergun.C

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    Copyright (C) 2011-2012 OpenFOAM Foundation
    Copyright (C) 2022 OpenCFD Ltd.
-------------------------------------------------------------------------------
License
    This file is part of OpenFOAM.

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#include "Ergun.H"
#include "addToRunTimeSelectionTable.H"

// * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //

namespace Foam
{
namespace multiphaseEuler
{
namespace dragModels
{
    defineTypeNameAndDebug(Ergun, 0);

    addToRunTimeSelectionTable
    (
        dragModel,
        Ergun,
        dictionary
    );
}
}
}


// * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //

Foam::multiphaseEuler::dragModels::Ergun::Ergun
(
    const dictionary& interfaceDict,
    const phaseModel& phase1,
    const phaseModel& phase2
)
:
    dragModel(interfaceDict, phase1, phase2)
{}


// * * * * * * * * * * * * * * * * Destructor  * * * * * * * * * * * * * * * //

Foam::multiphaseEuler::dragModels::Ergun::~Ergun()
{}


// * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //

Foam::tmp<Foam::volScalarField> Foam::multiphaseEuler::dragModels::Ergun::K
(
    const volScalarField& Ur
) const
{
    volScalarField alpha2(max(phase2_, scalar(1.0e-6)));

    return
        150.0*phase1_*phase2_.nu()*phase2_.rho()
       /sqr(alpha2*phase1_.d())
      + 1.75*phase2_.rho()*Ur/(alpha2*phase1_.d());
}


// ************************************************************************* //