Phi.H
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1 /*---------------------------------------------------------------------------*\
2  ========= |
3  \\ / F ield | OpenFOAM: The Open Source CFD Toolbox
4  \\ / O peration |
5  \\ / A nd | Copyright (C) 2011 OpenFOAM Foundation
6  \\/ M anipulation |
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23 
24 Class
25  Foam::PhiLimiter
26 
27 Description
28  Class with limiter function which returns the limiter for the
29  Phi differencing scheme.
30 
31  Used in conjunction with the template class PhiScheme.
32 
33 SourceFiles
34  Phi.C
35 
36 \*---------------------------------------------------------------------------*/
37 
38 #ifndef Phi_H
39 #define Phi_H
40 
41 #include "vector.H"
42 
43 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
44 
45 namespace Foam
46 {
47 
48 /*---------------------------------------------------------------------------*\
49  Class PhiLimiter Declaration
50 \*---------------------------------------------------------------------------*/
51 
52 class PhiLimiter
53 {
54  scalar k_;
55 
56 public:
57 
58  PhiLimiter(Istream& is)
59  :
60  k_(readScalar(is))
61  {
62  if (k_ < 0 || k_ > 1)
63  {
64  FatalIOErrorIn("PhiLimiter(Istream& is)", is)
65  << "coefficient = " << k_
66  << " should be >= 0 and <= 1"
67  << exit(FatalIOError);
68  }
69  }
70 
71  scalar limiter
72  (
73  const scalar cdWeight,
74  const scalar faceFlux,
75  const vector& PhiP,
76  const vector& PhiN,
77  const vector& Sf,
78  const scalar&
79  ) const
80  {
81  scalar phiP = Sf&PhiP;
82  scalar phiN = Sf&PhiN;
83 
84  scalar phiU;
85 
86  if (faceFlux > 0)
87  {
88  phiU = phiP;
89  }
90  else
91  {
92  phiU = phiN;
93  }
94 
95  scalar phiCD = cdWeight*phiP + (1 - cdWeight)*phiN;
96 
97  // Calculate the effective limiter for the Phi interpolation
98  //scalar PLimiter =
99  // (1.0 - k_) + k_*(faceFlux - phiU)/stabilise(phiCD - phiU, SMALL);
100 
101  scalar PLimiter =
102  ((faceFlux - phiU)/stabilise(phiCD - phiU, SMALL) + k_);
103 
104  // Limit the limiter between upwind and central
105  return max(min(PLimiter, 1), 0);
106  }
107 };
108 
109 
110 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
111 
112 } // End namespace Foam
113 
114 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
115 
116 #endif
117 
118 // ************************************************************************* //
An Istream is an abstract base class for all input systems (streams, files, token lists etc)...
Definition: Istream.H:57
errorManipArg< error, int > exit(error &err, const int errNo=1)
Definition: errorManip.H:124
Namespace for OpenFOAM.
IOerror FatalIOError
PhiLimiter(Istream &is)
Definition: Phi.H:57
dimensioned< Type > max(const dimensioned< Type > &, const dimensioned< Type > &)
bool readScalar(const char *buf, doubleScalar &s)
Read whole of buf as a scalar. Return true if succesful.
Definition: doubleScalar.H:63
tmp< DimensionedField< scalar, GeoMesh > > stabilise(const DimensionedField< scalar, GeoMesh > &dsf, const dimensioned< scalar > &ds)
scalar limiter(const scalar cdWeight, const scalar faceFlux, const vector &PhiP, const vector &PhiN, const vector &Sf, const scalar &) const
Definition: Phi.H:71
Class with limiter function which returns the limiter for the Phi differencing scheme.
Definition: Phi.H:51
dimensioned< Type > min(const dimensioned< Type > &, const dimensioned< Type > &)
#define FatalIOErrorIn(functionName, ios)
Report an error message using Foam::FatalIOError.
Definition: error.H:325