powerLaw.C

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#include "powerLaw.H"
#include "volFields.H"
#include "addToRunTimeSelectionTable.H"
 
// * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //
 
namespace Foam
{
namespace laminarModels
{
namespace generalizedNewtonianViscosityModels
{
    defineTypeNameAndDebug(powerLaw, 0);
 
    addToRunTimeSelectionTable
    (
        generalizedNewtonianViscosityModel,
        powerLaw,
        dictionary
    );
}
}
}
 
 
// * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //
 
Foam::laminarModels::generalizedNewtonianViscosityModels::powerLaw::powerLaw
(
    const dictionary& viscosityProperties
)
:
    generalizedNewtonianViscosityModel(viscosityProperties),
    powerLawCoeffs_(viscosityProperties.optionalSubDict(typeName + "Coeffs")),
    n_("n", dimless, powerLawCoeffs_),
    nuMin_("nuMin", dimViscosity, powerLawCoeffs_),
    nuMax_("nuMax", dimViscosity, powerLawCoeffs_)
{}
 
 
// * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * * //
 
bool Foam::laminarModels::generalizedNewtonianViscosityModels::powerLaw::read
(
    const dictionary& viscosityProperties
)
{
    generalizedNewtonianViscosityModel::read(viscosityProperties);
 
    powerLawCoeffs_ = viscosityProperties.optionalSubDict(typeName + "Coeffs");
 
    powerLawCoeffs_.readEntry("n", n_);
    powerLawCoeffs_.readEntry("nuMin", nuMin_);
    powerLawCoeffs_.readEntry("nuMax", nuMax_);
 
    return true;
}
 
 
Foam::tmp<Foam::volScalarField>
Foam::laminarModels::generalizedNewtonianViscosityModels::powerLaw::
nu
(
    const volScalarField& nu0,
    const volScalarField& strainRate
) const
{
    return max
    (
        nuMin_,
        min
        (
            nuMax_,
            nu0*pow
            (
                max
                (
                    dimensionedScalar("one", dimTime, 1)*strainRate,
                    dimensionedScalar("small", dimless, SMALL)
                ),
                n_.value() - scalar(1)
            )
        )
    );
}
 
 
// ************************************************************************* //