epsilonWallFunctionFvPatchScalarField.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
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    the Free Software Foundation, either version 3 of the License, or
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Class
    Foam::epsilonWallFunctionFvPatchScalarField
 
Group
    grpWallFunctions
 
Description
    This boundary condition provides a wall constraint on turbulent kinetic
    energy dissipation rate, i.e. \c epsilon, for low- and high-Reynolds number
    turbulence models.
 
    The condition can be applied to wall boundaries for which it
    - calculates \c epsilon and \c G
    - specifies the near-wall \c epsilon value
 
    where
    \vartable
        epsilon | turbulent kinetic energy dissipation rate field
        G       | turbulent kinetic energy production field (divergence-free)
    \endvartable
 
    The low-Re correction is activated by setting the entry
    \c lowReCorrection to 'on'; in this mode the model switches between
    viscous and turbulent functions based on the viscous-to-turbulent
    \c y+ value derived from the \c kappa and \c E.
 
    When the \c lowReCorrection is inactive, the wall function operates
    in high-Re mode.
 
Usage
    \table
        Property        | Description              | Required  | Default value
        lowReCorrection | Low-Re correction active | no        | off
    \endtable
 
    Example of the boundary condition specification:
    \verbatim
    <patchName>
    {
        // Mandatory entries
        type            epsilonWallFunction;
 
        // Optional entries
    }
    \endverbatim
 
Note
    The coefficients \c Cmu, \c kappa, and \c E are obtained from
    the specified \c nutWallFunction in order to ensure that each patch
    possesses the same set of values for these coefficients.
 
See also
    Foam::fixedInternalValueFvPatchField
 
SourceFiles
    epsilonWallFunctionFvPatchScalarField.C
 
\*---------------------------------------------------------------------------*/
 
#ifndef epsilonWallFunctionFvPatchScalarField_H
#define epsilonWallFunctionFvPatchScalarField_H
 
#include "fixedValueFvPatchField.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
 
class turbulenceModel;
 
/*---------------------------------------------------------------------------*\
           Class epsilonWallFunctionFvPatchScalarField Declaration
\*---------------------------------------------------------------------------*/
 
class epsilonWallFunctionFvPatchScalarField
:
    public fixedValueFvPatchField<scalar>
{
protected:
 
    // Protected Data
 
        //- Tolerance used in weighted calculations
        static scalar tolerance_;
 
        //- Apply low-Re correction term; default = no
        bool lowReCorrection_;
 
        //- Initialised flag
        bool initialised_;
 
        //- Master patch ID
        label master_;
 
        //- Local copy of turbulence G field
        scalarField G_;
 
        //- Local copy of turbulence epsilon field
        scalarField epsilon_;
 
        //- List of averaging corner weights
        List<List<scalar>> cornerWeights_;
 
 
    // Protected Member Functions
 
        //- Set the master patch - master is responsible for updating all
        //- wall function patches
        virtual void setMaster();
 
        //- Create the averaging weights for cells which are bounded by
        //- multiple wall function faces
        virtual void createAveragingWeights();
 
        //- Helper function to return non-const access to an epsilon patch
        virtual epsilonWallFunctionFvPatchScalarField& epsilonPatch
        (
            const label patchi
        );
 
        //- Main driver to calculate the turbulence fields
        virtual void calculateTurbulenceFields
        (
            const turbulenceModel& turbulence,
            scalarField& G0,
            scalarField& epsilon0
        );
 
        //- Calculate the epsilon and G
        virtual void calculate
        (
            const turbulenceModel& turbulence,
            const List<scalar>& cornerWeights,
            const fvPatch& patch,
            scalarField& G,
            scalarField& epsilon
        );
 
        //- Return non-const access to the master patch ID
        virtual label& master()
        {
            return master_;
        }
 
 
public:
 
    //- Runtime type information
    TypeName("epsilonWallFunction");
 
 
    // Constructors
 
        //- Construct from patch and internal field
        epsilonWallFunctionFvPatchScalarField
        (
            const fvPatch&,
            const DimensionedField<scalar, volMesh>&
        );
 
        //- Construct from patch, internal field and dictionary
        epsilonWallFunctionFvPatchScalarField
        (
            const fvPatch&,
            const DimensionedField<scalar, volMesh>&,
            const dictionary&
        );
 
        //- Construct by mapping given
        //- epsilonWallFunctionFvPatchScalarField
        //- onto a new patch
        epsilonWallFunctionFvPatchScalarField
        (
            const epsilonWallFunctionFvPatchScalarField&,
            const fvPatch&,
            const DimensionedField<scalar, volMesh>&,
            const fvPatchFieldMapper&
        );
 
        //- Construct as copy
        epsilonWallFunctionFvPatchScalarField
        (
            const epsilonWallFunctionFvPatchScalarField&
        );
 
        //- Construct and return a clone
        virtual tmp<fvPatchScalarField> clone() const
        {
            return tmp<fvPatchScalarField>
            (
                new epsilonWallFunctionFvPatchScalarField(*this)
            );
        }
 
        //- Construct as copy setting internal field reference
        epsilonWallFunctionFvPatchScalarField
        (
            const epsilonWallFunctionFvPatchScalarField&,
            const DimensionedField<scalar, volMesh>&
        );
 
        //- Construct and return a clone setting internal field reference
        virtual tmp<fvPatchScalarField> clone
        (
            const DimensionedField<scalar, volMesh>& iF
        ) const
        {
            return tmp<fvPatchScalarField>
            (
                new epsilonWallFunctionFvPatchScalarField(*this, iF)
            );
        }
 
 
    //- Destructor
    virtual ~epsilonWallFunctionFvPatchScalarField() = default;
 
 
    // Member Functions
 
        // Access
 
            //- Return non-const access to the master's G field
            scalarField& G(bool init = false);
 
            //- Return non-const access to the master's epsilon field
            scalarField& epsilon(bool init = false);
 
 
        // Evaluation functions
 
            //- Update the coefficients associated with the patch field
            virtual void updateCoeffs();
 
            //- Update the coefficients associated with the patch field
            virtual void updateWeightedCoeffs(const scalarField& weights);
 
            //- Manipulate matrix
            virtual void manipulateMatrix(fvMatrix<scalar>& matrix);
 
            //- Manipulate matrix with given weights
            virtual void manipulateMatrix
            (
                fvMatrix<scalar>& matrix,
                const scalarField& weights
            );
 
 
        // I-O
 
            //- Write
            virtual void write(Ostream&) const;
};
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
} // End namespace Foam
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#endif
 
// ************************************************************************* //