Arrhenius.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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Class
    Foam::viscosityModels::Arrhenius
 
Description
    Arrhenius type of dependency on a given scalar field name. Most likely
    temperature. The expression is as follow:
    \verbatim
        mu = exp(-alpha_*(T - Talpha_))
    \endverbatim
 
SourceFiles
    Arrhenius.C
 
\*---------------------------------------------------------------------------*/
 
#ifndef Arrhenius_H
#define Arrhenius_H
 
#include "viscosityModel.H"
#include "dimensionedScalar.H"
#include "volFields.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
namespace viscosityModels
{
 
/*---------------------------------------------------------------------------*\
                           Class Arrhenius Declaration
\*---------------------------------------------------------------------------*/
 
template<class ViscousModel>
class Arrhenius
:
    public ViscousModel
{
    // Private data
 
        dictionary ArrheniusCoeffs_;
 
        // Model coefficients
        dimensionedScalar alpha_;
        dimensionedScalar Talpha_;
 
        //- Field used for as temperature
        word fieldName_;
 
        //- Auto pointer for scalar field
        autoPtr<volScalarField> field_;
 
        //- Reference to mesh
        const fvMesh& mesh_;
 
 
    // Private Member Functions
 
        //- Calculate and return the laminar viscosity
        tmp<volScalarField> calcNu(const volScalarField&) const;
 
 
public:
 
    //- Runtime type information
    TypeName("Arrhenius");
 
 
    // Constructors
 
        //- Construct from components
        Arrhenius
        (
            const word& name,
            const dictionary& viscosityProperties,
            const volVectorField& U,
            const surfaceScalarField& phi
        );
 
 
    //- Destructor
    virtual ~Arrhenius() = default;
 
 
    // Member Functions
 
        //- Correct the laminar viscosity
        virtual void correct()
        {
            ViscousModel::correct();
 
            const auto* fldPtr = mesh_.findObject<volScalarField>(fieldName_);
 
            if (fldPtr)
            {
                this->nu_ *= calcNu(*fldPtr);
            }
        }
 
        //- Read transportProperties dictionary
        virtual bool read(const dictionary& viscosityProperties);
};
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
} // End namespace viscosityModels
} // End namespace Foam
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#ifdef NoRepository
#   include "Arrhenius.C"
#endif
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#endif
 
// ************************************************************************* //