1 /*---------------------------------------------------------------------------*\
3 \\ / F ield | OpenFOAM: The Open Source CFD Toolbox
5 \\ / A nd | Copyright (C) 1991-2009 OpenCFD Ltd.
7 -------------------------------------------------------------------------------
9 This file is part of OpenFOAM.
11 OpenFOAM is free software; you can redistribute it and/or modify it
12 under the terms of the GNU General Public License as published by the
13 Free Software Foundation; either version 2 of the License, or (at your
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16 OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
17 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
18 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
21 You should have received a copy of the GNU General Public License
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23 Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
26 Foam::diagonalPreconditioner
29 Diagonal preconditioner for both symmetric and asymmetric matrices.
31 The reciprocal of the diagonal is calculated and stored for reuse
32 because on most systems '*' is faster than '/'.
35 diagonalPreconditioner.C
37 \*---------------------------------------------------------------------------*/
39 #ifndef diagonalPreconditioner_H
40 #define diagonalPreconditioner_H
42 #include "lduMatrix.H"
44 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
49 /*---------------------------------------------------------------------------*\
50 Class diagonalPreconditioner Declaration
51 \*---------------------------------------------------------------------------*/
53 class diagonalPreconditioner
55 public lduMatrix::preconditioner
59 //- The reciprocal diagonal
63 // Private Member Functions
65 //- Disallow default bitwise copy construct
66 diagonalPreconditioner(const diagonalPreconditioner&);
68 //- Disallow default bitwise assignment
69 void operator=(const diagonalPreconditioner&);
74 //- Runtime type information
80 //- Construct from matrix components and preconditioner solver controls
81 diagonalPreconditioner
83 const lduMatrix::solver&,
84 const dictionary& solverControlsUnused
90 virtual ~diagonalPreconditioner()
96 //- Return wA the preconditioned form of residual rA
97 virtual void precondition
100 const scalarField& rA,
101 const direction cmpt=0
104 //- Return wT the transpose-matrix preconditioned form of residual rT.
105 virtual void preconditionT
108 const scalarField& rT,
109 const direction cmpt=0
112 return precondition(wT, rT, cmpt);
117 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
119 } // End namespace Foam
121 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
125 // ************************************************************************* //