JohnsonJacksonFrictionalStress.C

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/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
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    \\  /    A nd           | Copyright (C) 1991-2010 OpenCFD Ltd.
     \\/     M anipulation  |
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#include "JohnsonJacksonFrictionalStress.H"
#include <OpenFOAM/addToRunTimeSelectionTable.H>

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

namespace Foam
{
    defineTypeNameAndDebug(JohnsonJacksonFrictionalStress, 0);

    addToRunTimeSelectionTable
    (
        frictionalStressModel,
        JohnsonJacksonFrictionalStress,
        dictionary
    );
}


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

Foam::JohnsonJacksonFrictionalStress::JohnsonJacksonFrictionalStress
(
    const dictionary& dict
)
:
    frictionalStressModel(dict)
{}


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

Foam::JohnsonJacksonFrictionalStress::~JohnsonJacksonFrictionalStress()
{}


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

Foam::tmp<Foam::volScalarField> Foam::JohnsonJacksonFrictionalStress::
frictionalPressure
(
    const volScalarField& alpha,
    const dimensionedScalar& alphaMinFriction,
    const dimensionedScalar& alphaMax,
    const dimensionedScalar& Fr,
    const dimensionedScalar& eta,
    const dimensionedScalar& p
) const
{

    return
        Fr*pow(max(alpha - alphaMinFriction, scalar(0)), eta)
       /pow(max(alphaMax - alpha, scalar(5.0e-2)), p);
}


Foam::tmp<Foam::volScalarField> Foam::JohnsonJacksonFrictionalStress::
frictionalPressurePrime
(
    const volScalarField& alpha,
    const dimensionedScalar& alphaMinFriction,
    const dimensionedScalar& alphaMax,
    const dimensionedScalar& Fr,
    const dimensionedScalar& eta,
    const dimensionedScalar& p
) const
{
    return Fr*
    (
        eta*pow(max(alpha - alphaMinFriction, scalar(0)), eta - 1.0)
       *(alphaMax-alpha) + p*pow(max(alpha - alphaMinFriction, scalar(0)), eta)
    )/pow(max(alphaMax - alpha, scalar(5.0e-2)), p + 1.0);
}


Foam::tmp<Foam::volScalarField> Foam::JohnsonJacksonFrictionalStress::muf
(
    const volScalarField& alpha,
    const dimensionedScalar& alphaMax,
    const volScalarField& pf,
    const volSymmTensorField& D,
    const dimensionedScalar& phi
) const
{
    return dimensionedScalar("0.5", dimTime, 0.5)*pf*sin(phi);
}


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