SchaefferFrictionalStress.C

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/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   \\    /   O peration     |
    \\  /    A nd           | Copyright (C) 2011-2015 OpenFOAM Foundation
     \\/     M anipulation  |
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License
    This file is part of OpenFOAM.
 
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#include "SchaefferFrictionalStress.H"
#include "addToRunTimeSelectionTable.H"
 
// * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //
 
namespace Foam
{
namespace kineticTheoryModels
{
namespace frictionalStressModels
{
    defineTypeNameAndDebug(Schaeffer, 0);
 
    addToRunTimeSelectionTable
    (
        frictionalStressModel,
        Schaeffer,
        dictionary
    );
}
}
}
 
 
// * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //
 
Foam::kineticTheoryModels::frictionalStressModels::Schaeffer::Schaeffer
(
    const dictionary& dict
)
:
    frictionalStressModel(dict),
    coeffDict_(dict.subDict(typeName + "Coeffs")),
    phi_("phi", dimless, coeffDict_)
{
    phi_ *= constant::mathematical::pi/180.0;
}
 
 
// * * * * * * * * * * * * * * * * Destructor  * * * * * * * * * * * * * * * //
 
Foam::kineticTheoryModels::frictionalStressModels::Schaeffer::~Schaeffer()
{}
 
 
// * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //
 
Foam::tmp<Foam::volScalarField>
Foam::kineticTheoryModels::frictionalStressModels::Schaeffer::
frictionalPressure
(
    const volScalarField& alpha1,
    const dimensionedScalar& alphaMinFriction,
    const dimensionedScalar& alphaMax
) const
{
    return
        dimensionedScalar("1e24", dimensionSet(1, -1, -2, 0, 0), 1e24)
       *pow(Foam::max(alpha1 - alphaMinFriction, scalar(0)), 10.0);
}
 
 
Foam::tmp<Foam::volScalarField>
Foam::kineticTheoryModels::frictionalStressModels::Schaeffer::
frictionalPressurePrime
(
    const volScalarField& alpha1,
    const dimensionedScalar& alphaMinFriction,
    const dimensionedScalar& alphaMax
) const
{
    return
        dimensionedScalar("1e25", dimensionSet(1, -1, -2, 0, 0), 1e25)
       *pow(Foam::max(alpha1 - alphaMinFriction, scalar(0)), 9.0);
}
 
 
Foam::tmp<Foam::volScalarField>
Foam::kineticTheoryModels::frictionalStressModels::Schaeffer::nu
(
    const volScalarField& alpha1,
    const dimensionedScalar& alphaMinFriction,
    const dimensionedScalar& alphaMax,
    const volScalarField& pf,
    const volSymmTensorField& D
) const
{
    const scalar I2Dsmall = 1.0e-15;
 
    // Creating nu assuming it should be 0 on the boundary which may not be
    // true
    tmp<volScalarField> tnu
    (
        new volScalarField
        (
            IOobject
            (
                "Schaeffer:nu",
                alpha1.mesh().time().timeName(),
                alpha1.mesh(),
                IOobject::NO_READ,
                IOobject::NO_WRITE,
                false
            ),
            alpha1.mesh(),
            dimensionedScalar("nu", dimensionSet(0, 2, -1, 0, 0), 0.0)
        )
    );
 
    volScalarField& nuf = tnu();
 
    forAll(D, celli)
    {
        if (alpha1[celli] > alphaMinFriction.value())
        {
            nuf[celli] =
                0.5*pf[celli]*sin(phi_.value())
               /(
                    sqrt(1.0/6.0*(sqr(D[celli].xx() - D[celli].yy())
                  + sqr(D[celli].yy() - D[celli].zz())
                  + sqr(D[celli].zz() - D[celli].xx()))
                  + sqr(D[celli].xy()) + sqr(D[celli].xz())
                  + sqr(D[celli].yz())) + I2Dsmall
                );
        }
    }
 
    // Correct coupled BCs
    nuf.correctBoundaryConditions();
 
    return tnu;
}
 
 
bool Foam::kineticTheoryModels::frictionalStressModels::Schaeffer::read()
{
    coeffDict_ <<= dict_.subDict(typeName + "Coeffs");
 
    phi_.read(coeffDict_);
    phi_ *= constant::mathematical::pi/180.0;
 
    return true;
}
 
 
// ************************************************************************* //