FreeFOAM The Cross-Platform CFD Toolkit
locDynOneEqEddy.H
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23 
24 Class
25  Foam::incompressible::LESModels::locDynOneEqEddy
26 
27 Description
28  Localised Dynamic One Equation Eddy Viscosity Model for incompressible
29  flows
30 
31  Eddy viscosity SGS model using a modeled balance equation to simulate
32  the behaviour of k, hence
33  @verbatim
34  d/dt(k) + div(U*k) - div(nuSgs*grad(k))
35  =
36  -B*L - ce*rho*k^3/2/delta
37  and
38  B = 2/3*k*I - 2*nuSgs*dev(D)
39  Beff = 2/3*k*I - 2*nuEff*dev(D)
40  where
41  nuSgs = cD*delta^2*||D||
42  nuEff = nuSgs + nu
43  @endverbatim
44 
45  A dynamic procedure is here applied to evaluate ck and ce
46  @verbatim
47  ck=<L.M>/<M.M>
48  and
49  ce=<e*m>/<m*m>
50  where
51  K = 0.5*(F(U.U) - F(U).F(U))
52  L = (F(U*U) - F(U)*F(U) - 0.33*K*I)
53  M = delta*(F(sqrt(k)*D) - 2*sqrt(K + filter(k))*F(D))
54  m = pow(K + F(k), 3.0/2.0)/(2*delta) - F(pow(k, 3.0/2.0))/delta
55  e = 2*delta*ck*(F(sqrt(k)*(D && D)) - 2*sqrt(K + F(k))*(F(D) && F(D)))/
56  @endverbatim
57 
58 SourceFiles
59  locDynOneEqEddy.C
60 
61 \*---------------------------------------------------------------------------*/
62 
63 #ifndef locDynOneEqEddy_H
64 #define locDynOneEqEddy_H
65 
68 #include <LESfilters/LESfilter.H>
69 
70 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
71 
72 namespace Foam
73 {
74 namespace incompressible
75 {
76 namespace LESModels
77 {
78 
79 /*---------------------------------------------------------------------------*\
80  Class locDynOneEqEddy Declaration
81 \*---------------------------------------------------------------------------*/
82 
84 :
85  public GenEddyVisc
86 {
87  // Private data
88 
89  volScalarField k_;
90 
91  simpleFilter simpleFilter_;
92  autoPtr<LESfilter> filterPtr_;
93  LESfilter& filter_;
94 
95 
96  // Private Member Functions
97 
98  //- Update sub-grid scale fields
99  void updateSubGridScaleFields
100  (
101  const volSymmTensorField& D,
102  const volScalarField& KK
103  );
104 
105  //- Calculate ck, ce by filtering the velocity field U.
106  volScalarField ck
107  (
108  const volSymmTensorField&,
109  const volScalarField&
110  ) const;
111 
112  volScalarField ce
113  (
114  const volSymmTensorField&,
115  const volScalarField&
116  ) const;
117 
118  // Disallow default bitwise copy construct and assignment
120  locDynOneEqEddy& operator=(const locDynOneEqEddy&);
121 
122 
123 public:
124 
125  //- Runtime type information
126  TypeName("locDynOneEqEddy");
127 
128  // Constructors
129 
130  //- Construct from components
132  (
133  const volVectorField& U,
134  const surfaceScalarField& phi,
136  );
137 
138 
139  //- Destructor
141  {}
142 
143 
144  // Member Functions
145 
146  //- Return SGS kinetic energy
147  virtual tmp<volScalarField> k() const
148  {
149  return k_;
150  }
151 
152  //- Return the effective diffusivity for k
154  {
155  return tmp<volScalarField>
156  (
157  new volScalarField("DkEff", nuSgs_ + nu())
158  );
159  }
160 
161  //- Correct Eddy-Viscosity and related properties
162  virtual void correct(const tmp<volTensorField>& gradU);
163 
164  //- Read LESProperties dictionary
165  virtual bool read();
166 };
167 
168 
169 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
170 
171 } // End namespace LESModels
172 } // End namespace incompressible
173 } // End namespace Foam
174 
175 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
176 
177 #endif
178 
179 // ************************ vim: set sw=4 sts=4 et: ************************ //