ODESystem.H
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5  \\ / A nd | Copyright (C) 2011-2013 OpenFOAM Foundation
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23 
24 Class
25  Foam::ODESystem
26 
27 Description
28  Abstract base class for the systems of ordinary differential equations.
29 
30 \*---------------------------------------------------------------------------*/
31 
32 #ifndef ODESystem_H
33 #define ODESystem_H
34 
35 #include "scalarField.H"
36 #include "scalarMatrices.H"
37 
38 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
39 
40 namespace Foam
41 {
42 
43 /*---------------------------------------------------------------------------*\
44  Class ODESystem Declaration
45 \*---------------------------------------------------------------------------*/
46 
47 class ODESystem
48 {
49 
50 public:
51 
52  // Constructors
53 
54  //- Construct null
55  ODESystem()
56  {}
57 
58 
59  //- Destructor
60  virtual ~ODESystem()
61  {}
62 
63 
64  // Member Functions
65 
66  //- Return the number of equations in the system
67  virtual label nEqns() const = 0;
68 
69  //- Calculate the derivatives in dydx
70  virtual void derivatives
71  (
72  const scalar x,
73  const scalarField& y,
74  scalarField& dydx
75  ) const = 0;
76 
77  //- Calculate the Jacobian of the system
78  // Need by the stiff-system solvers
79  virtual void jacobian
80  (
81  const scalar x,
82  const scalarField& y,
83  scalarField& dfdx,
84  scalarSquareMatrix& dfdy
85  ) const = 0;
86 };
87 
88 
89 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
90 
91 } // End namespace Foam
92 
93 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
94 
95 #endif
96 
97 // ************************************************************************* //
intWM_LABEL_SIZE_t label
A label is an int32_t or int64_t as specified by the pre-processor macro WM_LABEL_SIZE.
Definition: label.H:59
Abstract base class for the systems of ordinary differential equations.
Definition: ODESystem.H:46
virtual void jacobian(const scalar x, const scalarField &y, scalarField &dfdx, scalarSquareMatrix &dfdy) const =0
Calculate the Jacobian of the system.
scalar y
ODESystem()
Construct null.
Definition: ODESystem.H:54
virtual ~ODESystem()
Destructor.
Definition: ODESystem.H:59
virtual label nEqns() const =0
Return the number of equations in the system.
virtual void derivatives(const scalar x, const scalarField &y, scalarField &dydx) const =0
Calculate the derivatives in dydx.
Namespace for OpenFOAM.