Frank.C

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    Copyright (C) 2014-2018 OpenFOAM Foundation
    Copyright (C) 2020 OpenCFD Ltd.
-------------------------------------------------------------------------------
License
    This file is part of OpenFOAM.

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#include "Frank.H"
#include "phasePair.H"
#include "addToRunTimeSelectionTable.H"

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

namespace Foam
{
namespace wallLubricationModels
{
    defineTypeNameAndDebug(Frank, 0);
    addToRunTimeSelectionTable
    (
        wallLubricationModel,
        Frank,
        dictionary
    );
}
}


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

Foam::wallLubricationModels::Frank::Frank
(
    const dictionary& dict,
    const phasePair& pair
)
:
    wallLubricationModel(dict, pair),
    Cwd_("Cwd", dimless, dict),
    Cwc_("Cwc", dimless, dict),
    p_(dict.get<scalar>("p"))
{}


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

Foam::wallLubricationModels::Frank::~Frank()
{}


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

Foam::tmp<Foam::volVectorField> Foam::wallLubricationModels::Frank::Fi() const
{
    volVectorField Ur(pair_.Ur());

    const volVectorField& n(nWall());
    const volScalarField& y(yWall());

    volScalarField Eo(pair_.Eo());
    volScalarField yTilde(y/(Cwc_*pair_.dispersed().d()));

    return zeroGradWalls
    (
        (
            pos0(Eo - 1)*neg(Eo - 5)*exp(-0.933*Eo + 0.179)
          + pos0(Eo - 5)*neg(Eo - 33)*(0.00599*Eo - 0.0187)
          + pos0(Eo - 33)*0.179
        )
       *max
        (
            dimensionedScalar(dimless/dimLength),
            (1 - yTilde)/(Cwd_*y*pow(yTilde, p_ - 1))
        )
       *pair_.continuous().rho()
       *magSqr(Ur - (Ur & n)*n)
       *n
    );
}


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