BirdCarreau.C

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    Copyright (C) 2017-2020 OpenCFD Ltd.
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License
    This file is part of OpenFOAM.
 
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#include "BirdCarreau.H"
#include "addToRunTimeSelectionTable.H"
#include "surfaceFields.H"
 
// * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //
 
namespace Foam
{
namespace viscosityModels
{
    defineTypeNameAndDebug(BirdCarreau, 0);
    addToRunTimeSelectionTable
    (
        viscosityModel,
        BirdCarreau,
        dictionary
    );
}
}
 
 
// * * * * * * * * * * * * Protected Member Functions  * * * * * * * * * * * * //
 
Foam::tmp<Foam::volScalarField>
Foam::viscosityModels::BirdCarreau::calcNu() const
{
    return
        nuInf_
      + (nu0_ - nuInf_)
      * pow(scalar(1) + pow(k_*strainRate(), a_), (n_ - 1.0)/a_);
}
 
 
// * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //
 
Foam::viscosityModels::BirdCarreau::BirdCarreau
(
    const word& name,
    const dictionary& viscosityProperties,
    const volVectorField& U,
    const surfaceScalarField& phi
)
:
    viscosityModel(name, viscosityProperties, U, phi),
    BirdCarreauCoeffs_
    (
        viscosityProperties.optionalSubDict(typeName + "Coeffs")
    ),
    nu0_("nu0", dimViscosity, BirdCarreauCoeffs_),
    nuInf_("nuInf", dimViscosity, BirdCarreauCoeffs_),
    k_("k", dimTime, BirdCarreauCoeffs_),
    n_("n", dimless, BirdCarreauCoeffs_),
    a_
    (
        BirdCarreauCoeffs_.getOrDefault
        (
            "a",
            dimensionedScalar("a", dimless, 2)
        )
    ),
    nu_
    (
        IOobject
        (
            name,
            U_.time().timeName(),
            U_.db(),
            IOobject::NO_READ,
            IOobject::AUTO_WRITE
        ),
        calcNu()
    )
{}
 
 
// * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * * //
 
bool Foam::viscosityModels::BirdCarreau::read
(
    const dictionary& viscosityProperties
)
{
    viscosityModel::read(viscosityProperties);
 
    BirdCarreauCoeffs_ =
        viscosityProperties.optionalSubDict(typeName + "Coeffs");
 
    BirdCarreauCoeffs_.readEntry("nu0", nu0_);
    BirdCarreauCoeffs_.readEntry("nuInf", nuInf_);
    BirdCarreauCoeffs_.readEntry("k", k_);
    BirdCarreauCoeffs_.readEntry("n", n_);
    a_ = BirdCarreauCoeffs_.getOrDefault
    (
        "a",
        dimensionedScalar("a", dimless, 2)
    );
 
    return true;
}
 
 
// ************************************************************************* //