FreeFOAM The Cross-Platform CFD Toolkit
diagonalPreconditioner.H
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10 
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23 
24 Class
25  Foam::diagonalPreconditioner
26 
27 Description
28  Diagonal preconditioner for both symmetric and asymmetric matrices.
29 
30  The reciprocal of the diagonal is calculated and stored for reuse
31  because on most systems '*' is faster than '/'.
32 
33 SourceFiles
34  diagonalPreconditioner.C
35 
36 \*---------------------------------------------------------------------------*/
37 
38 #ifndef diagonalPreconditioner_H
39 #define diagonalPreconditioner_H
40 
41 #include <OpenFOAM/lduMatrix.H>
42 
43 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
44 
45 namespace Foam
46 {
47 
48 /*---------------------------------------------------------------------------*\
49  Class diagonalPreconditioner Declaration
50 \*---------------------------------------------------------------------------*/
51 
53 :
55 {
56  // Private data
57 
58  //- The reciprocal diagonal
59  scalarField rD;
60 
61 
62  // Private Member Functions
63 
64  //- Disallow default bitwise copy construct
66 
67  //- Disallow default bitwise assignment
68  void operator=(const diagonalPreconditioner&);
69 
70 
71 public:
72 
73  //- Runtime type information
74  TypeName("diagonal");
75 
76 
77  // Constructors
78 
79  //- Construct from matrix components and preconditioner solver controls
81  (
82  const lduMatrix::solver&,
83  const dictionary& solverControlsUnused
84  );
85 
86 
87  // Destructor
88 
90  {}
91 
92 
93  // Member Functions
94 
95  //- Return wA the preconditioned form of residual rA
96  virtual void precondition
97  (
98  scalarField& wA,
99  const scalarField& rA,
100  const direction cmpt=0
101  ) const;
102 
103  //- Return wT the transpose-matrix preconditioned form of residual rT.
104  virtual void preconditionT
105  (
106  scalarField& wT,
107  const scalarField& rT,
108  const direction cmpt=0
109  ) const
110  {
111  return precondition(wT, rT, cmpt);
112  }
113 };
114 
115 
116 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
117 
118 } // End namespace Foam
119 
120 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
121 
122 #endif
123 
124 // ************************ vim: set sw=4 sts=4 et: ************************ //