bandCompression.H

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    Copyright (C) 2011-2013 OpenFOAM Foundation
    Copyright (C) 2022 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.
 
    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
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InNamespace
    Foam
 
Description
    The bandCompression function renumbers the addressing such that the
    band of the matrix is reduced. The algorithm uses a simple search
    through the neighbour list in order of connectivity.
 
    See http://en.wikipedia.org/wiki/Cuthill-McKee_algorithm
 
SourceFiles
    bandCompression.C
 
\*---------------------------------------------------------------------------*/
 
#ifndef Foam_bandCompression_H
#define Foam_bandCompression_H
 
#include "labelList.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
 
// Forward Declarations
template<class T> class CompactListList;
 
} // End namespace Foam
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
namespace meshTools
{
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
//- Renumber (mesh) addressing to reduce the band of the matrix,
//- using the Cuthill-McKee algorithm.
//
//  \returns order in which the cells are to be visited (ordered to original)
labelList bandCompression(const CompactListList<label>& addressing);
 
//- Renumber (mesh) addressing to reduce the band of the matrix,
//- using the Cuthill-McKee algorithm.
//
//  \returns order in which the cells are to be visited (ordered to original)
labelList bandCompression(const labelListList& addressing);
 
//- Renumber with addressing in losort form (neighbour + start in neighbour),
//- using the Cuthill-McKee algorithm.
//
//  \returns order in which the cells are to be visited (ordered to original)
labelList bandCompression
(
    const labelUList& cellCells,
    const labelUList& offsets
);
 
 
} // End namespace meshTools
} // End namespace Foam
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
 
//- Forward to meshTools::bandCompression
inline labelList bandCompression(const labelListList& cellCellAddressing)
{
    return meshTools::bandCompression(cellCellAddressing);
}
 
//- Forward to meshTools::bandCompression
inline labelList bandCompression
(
    const labelUList& cellCells,
    const labelUList& offsets
)
{
    return meshTools::bandCompression(cellCells, offsets);
}
 
} // End namespace Foam
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#endif
 
// ************************************************************************* //