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========= |
\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
\\ / O peration | Website: https://openfoam.org
\\ / A nd | Copyright (C) 2025 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::zoneGenerators::difference
Description
A zoneGenerator which selects the elements in the first zones generated by
the given list of zoneGenerators and removes the elements which are in
subsequent zones
An difference faceZones is oriented if the first faceZones is oriented,
otherwise the returned faceZone is unoriented.
Usage
\table
Property | Description | Required | Default value
type | Type: difference | yes |
name | Name of the zone | no | zoneGenerator name
zoneType | Type of zone | no | all the zone types
moveUpdate | Switch to update after mesh motion | no | false
\endtable
These options are followed by a list of any number of zoneGenerators which
can either generate the zones locally or return zones from the lists of
zones held by the mesh using the zoneGenerators::lookup zoneGenerator. The
resultant zones are initialised by the first zoneGenerator in the list and
then the zones generated by subsequent zoneGenerator are subtracted
from them.
Each zoneGenerator returns a zoneSet containing a pointZone and/or a
cellZone and/or a faceZone, the zoneGenerators::difference operation
combines each of the zone types unless the \c zoneType is specified in which
case only the zones of that type are combined.
A cellZone named \c coneNotAnnulus containing the with centres inside the
predefined \c cone1 which is looked-up from the cellZoneList less the
cells in locally defined annulus is be generated by
\verbatim
notConeOrAnnulus
{
type difference;
cone1;
annulus1
{
type annulus;
zoneType cell;
point1 (-0.0075 0 -1);
point2 (-0.003 0.0025 1);
outerRadius 0.002;
innerRadius 0.001;
}
}
\endverbatim
See also
zoneGenerators::Union
zoneGenerators::intersection
zoneGeneratorList
SourceFiles
difference.C
\*---------------------------------------------------------------------------*/
#ifndef difference_zoneGenerator_H
#define difference_zoneGenerator_H
#include "zoneGeneratorList.H"
#include "union.H"
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
namespace Foam
{
namespace zoneGenerators
{
/*---------------------------------------------------------------------------*\
Class difference Declaration
\*---------------------------------------------------------------------------*/
class difference
:
public Union
{
public:
//- Runtime type information
TypeName("difference");
// Constructors
//- Construct from dictionary
difference
(
const word& name,
const polyMesh& mesh,
const dictionary& dict
);
//- Destructor
virtual ~difference();
// Member Functions
virtual zoneSet generate() const;
};
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
} // End namespace zoneGenerators
} // End namespace Foam
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
#endif
// ************************************************************************* //
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