powerLaw.C

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    Copyright (C) 2017 OpenCFD Ltd
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#include "powerLaw.H"
#include "addToRunTimeSelectionTable.H"
#include "surfaceFields.H"

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

namespace Foam
{
namespace viscosityModels
{
    defineTypeNameAndDebug(powerLaw, 0);

    addToRunTimeSelectionTable
    (
        viscosityModel,
        powerLaw,
        dictionary
    );
}
}


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

Foam::tmp<Foam::volScalarField>
Foam::viscosityModels::powerLaw::calcNu() const
{
    return max
    (
        nuMin_,
        min
        (
            nuMax_,
            k_*pow
            (
                max
                (
                    dimensionedScalar("one", dimTime, 1.0)*strainRate(),
                    dimensionedScalar("SMALL", dimless, SMALL)
                ),
                n_.value() - scalar(1)
            )
        )
    );
}


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

Foam::viscosityModels::powerLaw::powerLaw
(
    const word& name,
    const dictionary& viscosityProperties,
    const volVectorField& U,
    const surfaceScalarField& phi
)
:
    viscosityModel(name, viscosityProperties, U, phi),
    powerLawCoeffs_(viscosityProperties.optionalSubDict(typeName + "Coeffs")),
    k_("k", dimViscosity, powerLawCoeffs_),
    n_("n", dimless, powerLawCoeffs_),
    nuMin_("nuMin", dimViscosity, powerLawCoeffs_),
    nuMax_("nuMax", dimViscosity, powerLawCoeffs_),
    nu_
    (
        IOobject
        (
            name,
            U_.time().timeName(),
            U_.db(),
            IOobject::NO_READ,
            IOobject::AUTO_WRITE
        ),
        calcNu()
    )
{}


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

bool Foam::viscosityModels::powerLaw::read
(
    const dictionary& viscosityProperties
)
{
    viscosityModel::read(viscosityProperties);

    powerLawCoeffs_ = viscosityProperties.optionalSubDict(typeName + "Coeffs");

    powerLawCoeffs_.readEntry("k", k_);
    powerLawCoeffs_.readEntry("n", n_);
    powerLawCoeffs_.readEntry("nuMin", nuMin_);
    powerLawCoeffs_.readEntry("nuMax", nuMax_);

    return true;
}


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