BirdCarreau.H

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    Copyright (C) 2017-2019 OpenCFD Ltd.
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License
    This file is part of OpenFOAM.
 
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    the Free Software Foundation, either version 3 of the License, or
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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_;
 
 
protected:
 
    // Protected Data
 
        volScalarField nu_;
 
    // Protected 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() = default;
 
 
    // 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
 
// ************************************************************************* //