PrandtlDelta.H

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    Copyright (C) 2019 OpenCFD Ltd.
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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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Class
    Foam::PrandtlDelta
 
Description
    Apply Prandtl mixing-length based damping function to the specified
    geometric delta to improve near-wall behavior or LES 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
 
        //- No copy construct
        PrandtlDelta(const PrandtlDelta&) = delete;
 
        //- No copy assignment
        void operator=(const PrandtlDelta&) = delete;
 
        // 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() = default;
 
 
    // Member Functions
 
        //- Read the LESdelta dictionary
        virtual void read(const dictionary&);
 
        // Correct values
        virtual void correct();
};
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
} // End namespace LESModels
} // End namespace Foam
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#endif
 
// ************************************************************************* //