variable.H

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License
    This file is part of OpenFOAM.
 
    OpenFOAM is free software: you can redistribute it and/or modify it
    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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    You should have received a copy of the GNU General Public License
    along with OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.
 
Class
    Foam::fv::heatTransferCoefficientModels::variable
 
Description
    Variable heat transfer model depending on local values. The Nusselt number
    is calculated as:
 
        \f[
            Nu = a*Re^b*Pr^c
        \f]
 
    And the heat transfer coefficient is calculated as:
 
        \f[
            htc = Nu*\kappa/L
        \f]
 
    Where:
 
    \vartable
        \kappa | Conductivity
        L      | Length scale
    \endvartable
 
Usage
    Example usage:
    \verbatim
    {
        heatTransferCoefficientModel variable;
 
        a           1;
        b           2;
        c           3;
        Pr          0.7;
        L           1e-3;
    }
    \endverbatim
 
\*---------------------------------------------------------------------------*/
 
#ifndef variable_heatTransferCoefficientModel_H
#define variable_heatTransferCoefficientModel_H
 
#include "heatTransferCoefficientModel.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
namespace fv
{
namespace heatTransferCoefficientModels
{
 
/*---------------------------------------------------------------------------*\
                           Class variable Declaration
\*---------------------------------------------------------------------------*/
 
class variable
:
    public heatTransferCoefficientModel
{
    // Private Data
 
        //- Name of neighbour velocity field; default = U
        word UName_;
 
        //- Model constant
        scalar a_;
 
        //- Model constant
        scalar b_;
 
        //- Model constant
        scalar c_;
 
        //- Length scale
        dimensionedScalar L_;
 
        //- Fluid Prandtl number
        dimensionedScalar Pr_;
 
        //- Heat transfer coefficient [W/m^2/K]
        volScalarField htc_;
 
 
    // Private Member Functions
 
        //- Non-virtual read
        void readCoeffs(const dictionary& dict);
 
 
public:
 
    //- Runtime type information
    TypeName("variable");
 
 
    // Constructors
 
        //- Construct from dictionary and mesh
        variable(const dictionary& dict, const fvMesh& mesh);
 
        //- Construct from dictionary and model
        variable(const dictionary& dict, const interRegionModel& model);
 
 
    //- Destructor
    virtual ~variable();
 
 
    // Member Functions
 
        //- Get the heat transfer coefficient
        virtual tmp<volScalarField> htc() const
        {
            return htc_;
        }
 
        //- Correct the heat transfer coefficient
        virtual void correct();
 
        //- Read dictionary
        virtual bool read(const dictionary& dict);
};
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
} // End namespace heatTransferCoefficientModels
} // End namespace fv
} // End namespace Foam
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#endif
 
// ************************************************************************* //