PrandtlDelta.H

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Class
    Foam::LESModels::PrandtlDelta

Description
    Apply Prandtl mixing-length based damping function to the specified
    geometric delta to improve near-wall behavior or LES SGS models.

    \verbatim
        delta = min(geometricDelta, (kappa/Cdelta)*y)
    \endverbatim

    Example specification in the turbulenceProperties dictionary:
    \verbatim
    delta           Prandtl;

    PrandtlCoeffs
    {
        delta   cubeRootVol;

        cubeRootVolCoeffs
        {
            deltaCoeff      1;
        }

        // Default coefficients
        kappa           0.41;
        Cdelta          0.158;
    }
    \endverbatim

SourceFiles
    PrandtlDelta.C

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

#ifndef PrandtlDelta_H
#define PrandtlDelta_H

#include "LESdelta.H"

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

namespace Foam
{
namespace LESModels
{

/*---------------------------------------------------------------------------*\
                           Class PrandtlDelta Declaration
\*---------------------------------------------------------------------------*/

class PrandtlDelta
:
    public LESdelta
{
    // Private data

        autoPtr<LESdelta> geometricDelta_;
        scalar kappa_;
        scalar Cdelta_;


    // Private Member Functions

        //- Disallow default bitwise copy construct and assignment
        PrandtlDelta(const PrandtlDelta&);
        void operator=(const PrandtlDelta&);

        // Calculate the delta values
        void calcDelta();


public:

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


    // Constructors

        //- Construct from name, turbulenceModel and dictionary
        PrandtlDelta
        (
            const word& name,
            const turbulenceModel& turbulence,
            const dictionary&
        );


    //- Destructor
    virtual ~PrandtlDelta()
    {}


    // Member Functions

        //- Read the LESdelta dictionary
        virtual void read(const dictionary&);

        // Correct values
        virtual void correct();
};


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

} // End namespace LESModels
} // End namespace Foam

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

#endif

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