powerLaw.C

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/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
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    \\  /    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 "powerLaw.H"
#include "addToRunTimeSelectionTable.H"
#include "surfaceFields.H"
 
// * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //
 
namespace Foam
{
namespace viscosityModels
{
    defineTypeNameAndDebug(powerLaw, 0);
 
    addToRunTimeSelectionTable
    (
        viscosityModel,
        powerLaw,
        dictionary
    );
}
}
 
 
// * * * * * * * * * * * * Private 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("VSMALL", dimless, VSMALL)
                ),
                n_.value() - scalar(1.0)
            )
        )
    );
}
 
 
// * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //
 
Foam::viscosityModels::powerLaw::powerLaw
(
    const word& name,
    const dictionary& viscosityProperties,
    const volVectorField& U,
    const surfaceScalarField& phi
)
:
    viscosityModel(name, viscosityProperties, U, phi),
    powerLawCoeffs_(viscosityProperties.subDict(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.subDict(typeName + "Coeffs");
 
    powerLawCoeffs_.lookup("k") >> k_;
    powerLawCoeffs_.lookup("n") >> n_;
    powerLawCoeffs_.lookup("nuMin") >> nuMin_;
    powerLawCoeffs_.lookup("nuMax") >> nuMax_;
 
    return true;
}
 
 
// ************************************************************************* //