FreeFOAM The Cross-Platform CFD Toolkit
oneEqEddy.H
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23 
24 Class
25  Foam::incompressible::LESModels::oneEqEddy
26 
27 Description
28  One Equation Eddy Viscosity Model for incompressible flows
29 
30  Eddy viscosity SGS model using a modeled balance equation to simulate the
31  behaviour of k, hence,
32  @verbatim
33  d/dt(k) + div(U*k) - div(nuEff*grad(k))
34  =
35  -B*L - ce*k^3/2/delta
36 
37  and
38 
39  B = 2/3*k*I - 2*nuSgs*dev(D)
40  Beff = 2/3*k*I - 2*nuEff*dev(D)
41 
42  where
43 
44  D = symm(grad(U));
45  nuSgs = ck*sqrt(k)*delta
46  nuEff = nuSgs + nu
47  @endverbatim
48 
49 SourceFiles
50  oneEqEddy.C
51 
52 \*---------------------------------------------------------------------------*/
53 
54 #ifndef oneEqEddy_H
55 #define oneEqEddy_H
56 
58 
59 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
60 
61 namespace Foam
62 {
63 namespace incompressible
64 {
65 namespace LESModels
66 {
67 
68 /*---------------------------------------------------------------------------*\
69  Class oneEqEddy Declaration
70 \*---------------------------------------------------------------------------*/
71 
72 class oneEqEddy
73 :
74  public GenEddyVisc
75 {
76  // Private data
77 
78  volScalarField k_;
79 
81 
82 
83  // Private Member Functions
84 
85  //- Update sub-grid scale fields
86  void updateSubGridScaleFields();
87 
88  // Disallow default bitwise copy construct and assignment
89  oneEqEddy(const oneEqEddy&);
90  oneEqEddy& operator=(const oneEqEddy&);
91 
92 
93 public:
94 
95  //- Runtime type information
96  TypeName("oneEqEddy");
97 
98  // Constructors
99 
100  //- Construct from components
101  oneEqEddy
102  (
103  const volVectorField& U,
104  const surfaceScalarField& phi,
106  );
107 
108 
109  //- Destructor
110  virtual ~oneEqEddy()
111  {}
112 
113 
114  // Member Functions
115 
116  //- Return SGS kinetic energy
117  virtual tmp<volScalarField> k() const
118  {
119  return k_;
120  }
121 
122  //- Return the effective diffusivity for k
124  {
125  return tmp<volScalarField>
126  (
127  new volScalarField("DkEff", nuSgs_ + nu())
128  );
129  }
130 
131  //- Correct Eddy-Viscosity and related properties
132  virtual void correct(const tmp<volTensorField>& gradU);
133 
134  //- Read LESProperties dictionary
135  virtual bool read();
136 };
137 
138 
139 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
140 
141 } // End namespace LESModels
142 } // End namespace incompressible
143 } // End namespace Foam
144 
145 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
146 
147 #endif
148 
149 // ************************ vim: set sw=4 sts=4 et: ************************ //