emptyFvPatchField.H

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/*---------------------------------------------------------------------------*\
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-------------------------------------------------------------------------------
    Copyright (C) 2011-2016 OpenFOAM Foundation
    Copyright (C) 2025 OpenCFD Ltd.
-------------------------------------------------------------------------------
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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    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
    for more details.
 
    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::emptyFvPatchField
 
Group
    grpConstraintBoundaryConditions
 
Description
    This boundary condition provides an 'empty' condition for reduced
    dimensions cases, i.e. 1- and 2-D geometries.  Apply this condition to
    patches whose normal is aligned to geometric directions that do not
    constitute solution directions.
 
    The "value" entry is NO_READ, NO_WRITE.
 
Usage
    Example of the boundary condition specification:
    \verbatim
    <patchName>
    {
        type    empty;
    }
    \endverbatim
 
SourceFiles
    emptyFvPatchField.C
 
\*---------------------------------------------------------------------------*/
 
#ifndef Foam_emptyFvPatchField_H
#define Foam_emptyFvPatchField_H
 
#include "fvPatchField.H"
#include "emptyFvPatch.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
 
/*---------------------------------------------------------------------------*\
                      Class emptyFvPatchField Declaration
\*---------------------------------------------------------------------------*/
 
template<class Type>
class emptyFvPatchField
:
    public fvPatchField<Type>
{
public:
 
    //- Runtime type information
    TypeName(emptyFvPatch::typeName_());  // fieldTypes::emptyTypeName_()
 
 
    // Constructors
 
        //- Construct from patch and internal field
        emptyFvPatchField
        (
            const fvPatch&,
            const DimensionedField<Type, volMesh>&
        );
 
        //- Construct from patch, internal field and dictionary.
        //- The "value" entry is NO_READ.
        emptyFvPatchField
        (
            const fvPatch&,
            const DimensionedField<Type, volMesh>&,
            const dictionary&
        );
 
        //- Construct by mapping given emptyFvPatchField onto a new patch
        emptyFvPatchField
        (
            const emptyFvPatchField<Type>&,
            const fvPatch&,
            const DimensionedField<Type, volMesh>&,
            const fvPatchFieldMapper&
        );
 
        //- Construct as copy
        emptyFvPatchField
        (
            const emptyFvPatchField<Type>&
        );
 
        //- Construct as copy setting internal field reference
        emptyFvPatchField
        (
            const emptyFvPatchField<Type>&,
            const DimensionedField<Type, volMesh>&
        );
 
        //- Return a clone
        virtual tmp<fvPatchField<Type>> clone() const
        {
            return fvPatchField<Type>::Clone(*this);
        }
 
        //- Clone with an internal field reference
        virtual tmp<fvPatchField<Type>> clone
        (
            const DimensionedField<Type, volMesh>& iF
        ) const
        {
            return fvPatchField<Type>::Clone(*this, iF);
        }
 
 
    // Member Functions
 
        // Mapping functions
 
            //- Map (and resize as needed) from self given a mapping object
            virtual void autoMap
            (
                const fvPatchFieldMapper&
            )
            {}
 
            //- Reverse map the given fvPatchField onto this fvPatchField
            virtual void rmap
            (
                const fvPatchField<Type>&,
                const labelList&
            )
            {}
 
 
        // Evaluation Functions
 
            //- Update the coefficients associated with the patch field
            //  This only checks to see the case is actually 1D or 2D
            //  for which this boundary condition is valid
            void updateCoeffs();
 
 
            //- Return the matrix diagonal coefficients corresponding to the
            //  evaluation of the value of this patchField with given weights
            virtual tmp<Field<Type>> valueInternalCoeffs
            (
                const tmp<scalarField>&
            ) const
            {
                return tmp<Field<Type>>::New();
            }
 
            //- Return the matrix source coefficients corresponding to the
            //  evaluation of the value of this patchField with given weights
            virtual tmp<Field<Type>> valueBoundaryCoeffs
            (
                const tmp<scalarField>&
            ) const
            {
                return tmp<Field<Type>>::New();
            }
 
            //- Return the matrix diagonal coefficients corresponding to the
            //- evaluation of the gradient of this patchField
            tmp<Field<Type>> gradientInternalCoeffs() const
            {
                return tmp<Field<Type>>::New();
            }
 
            //- Return the matrix source coefficients corresponding to the
            //- evaluation of the gradient of this patchField
            tmp<Field<Type>> gradientBoundaryCoeffs() const
            {
                return tmp<Field<Type>>::New();
            }
 
 
    // Contiguous storage
 
        //- Retrieve patch-normal gradient [contiguous storage].
        //- Placeholder value is zero (treated like zero-gradient).
        virtual void snGrad(UList<Type>& result) const
        {
            // Treat like zero-gradient
            result = Foam::zero{};
        }
 
 
    // Member Functions
 
        //- Write without "value" entry!
        virtual void write(Ostream&) const;
};
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
} // End namespace Foam
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#ifdef NoRepository
    #include "emptyFvPatchField.C"
#endif
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#endif
 
// ************************************************************************* //