BirdCarreau.H

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Class
    Foam::viscosityModels::BirdCarreau

Description
    An incompressible Bird-Carreau non-Newtonian viscosity model.

    The Bird-Carreau-Yasuda form is also supported if the optional "a"
    coefficient is specified.  "a" defaults to 2 for the Bird-Carreau model.

SourceFiles
    BirdCarreau.C

\*---------------------------------------------------------------------------*/

#ifndef BirdCarreau_H
#define BirdCarreau_H

#include "viscosityModel.H"
#include "dimensionedScalar.H"
#include "volFields.H"

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

namespace Foam
{
namespace viscosityModels
{

/*---------------------------------------------------------------------------*\
                         Class BirdCarreau Declaration
\*---------------------------------------------------------------------------*/

class BirdCarreau
:
    public viscosityModel
{
    // Private Data

        dictionary BirdCarreauCoeffs_;

        dimensionedScalar nu0_;
        dimensionedScalar nuInf_;
        dimensionedScalar k_;
        dimensionedScalar n_;
        dimensionedScalar a_;

        volScalarField nu_;


    // Private Member Functions

        //- Calculate and return the laminar viscosity
        tmp<volScalarField> calcNu() const;


public:

    //- Runtime type information
    TypeName("BirdCarreau");


    // Constructors

        //- Construct from components
        BirdCarreau
        (
            const word& name,
            const dictionary& viscosityProperties,
            const volVectorField& U,
            const surfaceScalarField& phi
        );


    //- Destructor
    virtual ~BirdCarreau()
    {}


    // Member Functions

        //- Return the laminar viscosity
        virtual tmp<volScalarField> nu() const
        {
            return nu_;
        }

        //- Return the laminar viscosity for patch
        virtual tmp<scalarField> nu(const label patchi) const
        {
            return nu_.boundaryField()[patchi];
        }

        //- Correct the laminar viscosity
        virtual void correct()
        {
            nu_ = calcNu();
        }

        //- Read transportProperties dictionary
        virtual bool read(const dictionary& viscosityProperties);
};


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

} // End namespace viscosityModels
} // End namespace Foam

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

#endif

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