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========= |
\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
\\ / O peration | Website: https://openfoam.org
\\ / A nd | Copyright (C) 2011-2026 OpenFOAM Foundation
\\/ M anipulation |
-------------------------------------------------------------------------------
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.
OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
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::fixedGradientFvPatchField
Description
This boundary condition supplies a fixed gradient condition, such that
the patch values are calculated using:
\f[
x_p = x_c + \frac{\nabla(x)}{\Delta}
\f]
where
\vartable
x_p | patch values
x_c | internal field values
\nabla(x)| gradient (user-specified)
\Delta | inverse distance from patch face centre to cell centre
\endvartable
Usage
\table
Property | Description | Required | Default value
gradient | gradient | yes |
\endtable
Example of the boundary condition specification:
\verbatim
<patchName>
{
type fixedGradient;
gradient uniform 0;
}
\endverbatim
SourceFiles
fixedGradientFvPatchField.C
\*---------------------------------------------------------------------------*/
#ifndef fixedGradientFvPatchField_H
#define fixedGradientFvPatchField_H
#include "fvPatchField.H"
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
namespace Foam
{
/*---------------------------------------------------------------------------*\
Class fixedGradientFvPatchField Declaration
\*---------------------------------------------------------------------------*/
template<class Type>
class fixedGradientFvPatchField
:
public fvPatchField<Type>
{
// Private Data
Field<Type> gradient_;
public:
//- Runtime type information
TypeName("fixedGradient");
// Constructors
//- Construct from patch and internal field
fixedGradientFvPatchField
(
const fvPatch&,
const DimensionedField<Type, fvMesh>&
);
//- Construct from patch, internal field and dictionary
fixedGradientFvPatchField
(
const fvPatch&,
const DimensionedField<Type, fvMesh>&,
const dictionary&,
const bool gradientRequired=true
);
//- Construct by mapping the given fixedGradientFvPatchField
// onto a new patch
fixedGradientFvPatchField
(
const fixedGradientFvPatchField<Type>&,
const fvPatch&,
const DimensionedField<Type, fvMesh>&,
const fieldMapper&,
const bool mappingRequired=true
);
//- Disallow copy without setting internal field reference
fixedGradientFvPatchField
(
const fixedGradientFvPatchField<Type>&
) = delete;
//- Copy constructor setting internal field reference
fixedGradientFvPatchField
(
const fixedGradientFvPatchField<Type>&,
const DimensionedField<Type, fvMesh>&
);
//- Construct and return a clone setting internal field reference
virtual tmp<fvPatchField<Type>> clone
(
const DimensionedField<Type, fvMesh>& iF
) const
{
return tmp<fvPatchField<Type>>
(
new fixedGradientFvPatchField<Type>(*this, iF)
);
}
// Member Functions
using fvPatchField<Type>::patch;
using fvPatchField<Type>::patchInternalField;
// Return defining fields
//- Return gradient at boundary
virtual Field<Type>& gradient()
{
return gradient_;
}
virtual const Field<Type>& gradient() const
{
return gradient_;
}
// Mapping functions
//- Map the given fvPatchField onto this fvPatchField
virtual void map(const fvPatchField<Type>&, const fieldMapper&);
//- Reset the fvPatchField to the given fvPatchField
// Used for mesh to mesh mapping
virtual void reset(const fvPatchField<Type>&);
// Evaluation functions
//- Return gradient at boundary
virtual tmp<Field<Type>> snGrad() const
{
return gradient_;
}
//- Evaluate the patch field
virtual void evaluate
(
const Pstream::commsTypes commsType =
Pstream::commsTypes::blocking
);
//- 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 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 the matrix diagonal coefficients corresponding to the
// evaluation of the gradient of this patchField
virtual tmp<Field<Type>> gradientInternalCoeffs() const;
//- Return the matrix source coefficients corresponding to the
// evaluation of the gradient of this patchField
virtual tmp<Field<Type>> gradientBoundaryCoeffs() const;
//- Write
virtual void write(Ostream&) const;
// Member Operators
//- Inherit assignment
using fvPatchField<Type>::operator=;
};
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
} // End namespace Foam
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
#ifdef NoRepository
#include "fixedGradientFvPatchField.C"
#endif
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
#endif
// ************************************************************************* //
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