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DeardorffDiffStress.H

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00001 /*---------------------------------------------------------------------------*\
00002   =========                 |
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00004    \\    /   O peration     |
00005     \\  /    A nd           | Copyright (C) 1991-2005 OpenCFD Ltd.
00006      \\/     M anipulation  |
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00008 License
00009     This file is part of OpenFOAM.
00010 
00011     OpenFOAM is free software; you can redistribute it and/or modify it
00012     under the terms of the GNU General Public License as published by the
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00014     option) any later version.
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00019     for more details.
00020 
00021     You should have received a copy of the GNU General Public License
00022     along with OpenFOAM; if not, write to the Free Software Foundation,
00023     Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
00024 
00025 Class
00026     DeardorffDiffStress
00027 
00028 Description
00029 <pre>
00030       Differential SGS Stress Equation Model
00031       ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
00032       The DSEM uses a model version of the full balance equation for the SGS
00033       stress tensor to simulate the behaviour of B, hence,
00034 
00035           d/dt(rho*B) + div(rho*U*B) - div(muSgs*grad(B))
00036           =
00037           P - c1*rho*epsilon/k*B - 0.667*(1 - c1)*rho*epsilon*I - c2*(P - 0.333*trP*I)
00038 
00039       where
00040 
00041           k = 0.5*trB,
00042           epsilon = ce*k^3/2/delta,
00043           epsilon/k = ce*k^1/2/delta
00044           P = -rho*(B'L + L'B)
00045           muSgs = ck*rho*sqrt(k)*delta
00046           muEff = muSgs + mu
00047 </pre>
00048 
00049 SourceFiles
00050     DeardorffDiffStress.C
00051 
00052 \*---------------------------------------------------------------------------*/
00053 
00054 #ifndef compressibleDeardorffDiffStress_H
00055 #define compressibleDeardorffDiffStress_H
00056 
00057 #include "GenSGSStress.H"
00058 
00059 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
00060 
00061 namespace Foam
00062 {
00063 namespace compressible
00064 {
00065 namespace LESmodels
00066 {
00067 
00068 /*---------------------------------------------------------------------------*\
00069                            Class DeardorffDiffStress Declaration
00070 \*---------------------------------------------------------------------------*/
00071 
00072 class DeardorffDiffStress
00073 :
00074     public GenSGSStress
00075 {
00076     // Private data
00077 
00078         dimensionedScalar ck_;
00079         dimensionedScalar cm_;
00080 
00081 
00082     // Private Member Functions
00083 
00084         // Disallow default bitwise copy construct and assignment
00085         DeardorffDiffStress(const DeardorffDiffStress&);
00086         DeardorffDiffStress& operator=(const DeardorffDiffStress&);
00087 
00088 
00089 public:
00090 
00091     //- Runtime type information
00092     TypeName("DeardorffDiffStress");
00093 
00094     // Constructors
00095 
00096         //- Constructor from components
00097         DeardorffDiffStress
00098         (
00099             const volScalarField& rho,
00100             const volVectorField& U,
00101             const surfaceScalarField& phi,
00102             const basicThermo& thermoPhysicalModel
00103         );
00104 
00105 
00106     // Destructor
00107 
00108         ~DeardorffDiffStress()
00109         {}
00110 
00111 
00112     // Member Functions
00113 
00114         //- Return the effective diffusivity for B
00115         tmp<volScalarField> DBEff() const
00116         {
00117             return tmp<volScalarField> 
00118             (
00119                 new volScalarField("DBEff", muSgs_ + mu())
00120             );
00121         }
00122 
00123         //- Correct Eddy-Viscosity and related properties
00124         void correct(const tmp<volTensorField>& gradU);
00125 
00126         //- Read turbulenceProperties dictionary
00127         bool read();
00128 };
00129 
00130 
00131 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
00132 
00133 } // End namespace LESmodels
00134 } // End namespace compressible
00135 } // End namespace Foam
00136 
00137 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
00138 
00139 #endif
00140 
00141 // ************************************************************************* //
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