powerLaw.H

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License
    This file is part of OpenFOAM.
 
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    under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.
 
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Class
    Foam::laminarModels::generalisedNewtonianViscosityModels::powerLaw
 
Description
    Standard power-law generalised Newtonian viscosity model
 
    The power-law model provides a function for viscosity, limited by
    minimum and maximum values \f$\nu_{\min}\f$ and \f$\nu_{\max}\f$
    respectively.
 
    Kinematic viscosity [m^2/s]
 
    \f[
        \nu = k\gamma^{n - 1}, \nu_{\min} \le \nu \le \nu_{\max}
    \f]
 
    Example specification:
    \verbatim
         viscosityModel powerLaw;
 
         nuMax      1e-3;
         nuMin      1e-5;
         k          1;
         n          0.5;
    \endverbatim
 
SourceFiles
    powerLaw.C
 
\*---------------------------------------------------------------------------*/
 
#ifndef powerLaw_H
#define powerLaw_H
 
#include "strainRateViscosityModel.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
namespace laminarModels
{
namespace generalisedNewtonianViscosityModels
{
 
/*---------------------------------------------------------------------------*\
                          Class powerLaw Declaration
\*---------------------------------------------------------------------------*/
 
class powerLaw
:
    public strainRateViscosityModel
{
    // Private Data
 
        dimensionedScalar k_;
        dimensionedScalar n_;
        dimensionedScalar nuMin_;
        dimensionedScalar nuMax_;
 
 
public:
 
    //- Runtime type information
    TypeName("powerLaw");
 
 
    // Constructors
 
        //- Construct from components
        powerLaw
        (
            const dictionary& viscosityProperties,
            const Foam::viscosity& viscosity,
            const volVectorField& U
        );
 
 
    //- Destructor
    virtual ~powerLaw()
    {}
 
 
    // Member Functions
 
        //- Read transportProperties dictionary
        virtual bool read(const dictionary& viscosityProperties);
 
        //- Return the laminar viscosity
        virtual tmp<volScalarField> nu
        (
            const volScalarField& nu0,
            const volScalarField& strainRate
        ) const;
};
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
} // End namespace generalisedNewtonianViscosityModels
} // End namespace laminarModels
} // End namespace Foam
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#endif
 
// ************************************************************************* //