1 /*---------------------------------------------------------------------------*\
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26 Foam::incompressible::LESModels::LRRDiffStress
29 Differential SGS Stress Equation Model for incompressible flows.
31 The DSEM uses a model version of the full balance equation for the SGS
32 stress tensor to simulate the behaviour of B, hence,
34 d/dt(B) + div(U*B) - div(nuSgs*grad(B))
36 P - c1*e/k*B - 0.667*(1 - c1)*e*I - c2*(P - 0.333*trP*I)
39 epsilon = ce*k^3/2/delta
40 epsilon/k = ce*k^1/2/delta
42 nuEff = ck*sqrt(k)*delta + nu
45 This version from Launder, Rece & Rodi 1975
50 \*---------------------------------------------------------------------------*/
52 #ifndef LRRDiffStress_H
53 #define LRRDiffStress_H
55 #include "GenSGSStress.H"
57 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
61 namespace incompressible
66 /*---------------------------------------------------------------------------*\
67 Class LRRDiffStress Declaration
68 \*---------------------------------------------------------------------------*/
76 dimensionedScalar ck_;
77 dimensionedScalar c1_;
78 dimensionedScalar c2_;
81 // Private Member Functions
83 //- Update sub-grid scale fields
84 void updateSubGridScaleFields(const volScalarField& K);
86 // Disallow default bitwise copy construct and assignment
87 LRRDiffStress(const LRRDiffStress&);
88 LRRDiffStress& operator=(const LRRDiffStress&);
93 //- Runtime type information
94 TypeName("LRRDiffStress");
98 //- Construct from components
101 const volVectorField& U,
102 const surfaceScalarField& phi,
103 transportModel& transport
108 virtual ~LRRDiffStress()
114 //- Return the effective diffusivity for B
115 tmp<volScalarField> DBEff() const
117 return tmp<volScalarField>
119 new volScalarField("DBEff", nuSgs_ + nu())
123 //- Correct Eddy-Viscosity and related properties
124 virtual void correct(const tmp<volTensorField>& gradU);
126 //- Read LESProperties dictionary
131 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
133 } // End namespace LESModels
134 } // End namespace incompressible
135 } // End namespace Foam
137 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
141 // ************************************************************************* //