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00001 /*---------------------------------------------------------------------------*\ 00002 ========= | 00003 \\ / F ield | OpenFOAM: The Open Source CFD Toolbox 00004 \\ / O peration | 00005 \\ / A nd | Copyright (C) 1991-2005 OpenCFD Ltd. 00006 \\/ M anipulation | 00007 ------------------------------------------------------------------------------- 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 00013 Free Software Foundation; either version 2 of the License, or (at your 00014 option) any later version. 00015 00016 OpenFOAM is distributed in the hope that it will be useful, but WITHOUT 00017 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 00018 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 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 mixedSmagorinsky 00027 00028 Description 00029 <pre> 00030 The mixed Isochoric Smagorinsky Model 00031 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 00032 The mixed model is a linear combination of an eddy viscosity model 00033 (Smagorinsky) with a scale similarity model. Hence 00034 00035 B = (L + C) + R = (F(v*v) - F(v)*F(v)) + R 00036 00037 The algebraic eddy viscosity SGS model is founded on the assumption 00038 that local equilibrium prevails, hence 00039 00040 R = 2/3*k*I - 2*nuEff*dev(D) 00041 00042 where 00043 00044 k = cI*delta^2*||D||^2 00045 nuEff = ck*sqrt(k)*delta + nu 00046 00047 The Leonard and cross contributions are incorporated 00048 by adding, 00049 00050 + div(((filter(U*U) - filter(U)*filter(U)) - 00051 0.333*I*tr(filter(U*U) - filter(U)*filter(U)))) 00052 + div((filter(U*epsilon) - filter(U)*filter(epsilon))) 00053 00054 to the rhs. of the equations. 00055 </pre> 00056 00057 SourceFiles 00058 mixedSmagorinsky.C 00059 00060 \*---------------------------------------------------------------------------*/ 00061 00062 #ifndef mixedSmagorinsky_H 00063 #define mixedSmagorinsky_H 00064 00065 #include "scaleSimilarity.H" 00066 #include "Smagorinsky.H" 00067 00068 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // 00069 00070 namespace Foam 00071 { 00072 namespace LESmodels 00073 { 00074 00075 /*---------------------------------------------------------------------------*\ 00076 Class mixedSmagorinsky Declaration 00077 \*---------------------------------------------------------------------------*/ 00078 00079 class mixedSmagorinsky 00080 : 00081 public scaleSimilarity, 00082 public Smagorinsky 00083 { 00084 // Private Member Functions 00085 00086 // Disallow default bitwise copy construct and assignment 00087 mixedSmagorinsky(const mixedSmagorinsky&); 00088 mixedSmagorinsky& operator=(const mixedSmagorinsky&); 00089 00090 public: 00091 00092 //- Runtime type information 00093 TypeName("mixedSmagorinsky"); 00094 00095 00096 // Constructors 00097 00098 //- Constructor from components 00099 mixedSmagorinsky 00100 ( 00101 const volVectorField& U, 00102 const surfaceScalarField& phi, 00103 transportModel& transport 00104 ); 00105 00106 00107 // Destructor 00108 00109 ~mixedSmagorinsky() 00110 {} 00111 00112 00113 // Member Functions 00114 00115 //- Return B. 00116 tmp<volTensorField> B() const; 00117 00118 //- Return the SGS turbulent kinetic energy. 00119 tmp<volScalarField> k() const; 00120 00121 //- Return the SGS turbulent disipation rate. 00122 tmp<volScalarField> epsilon() const; 00123 00124 //- Return the SGS viscosity. 00125 tmp<volScalarField> nuSgs() const 00126 { 00127 return nuSgs_; 00128 } 00129 00130 //- Implementation of div(B). This is necessary to override 00131 // (and include) the div(B) terms from both the parent classes. 00132 tmp<fvVectorMatrix> divB(volVectorField& U) const; 00133 00134 //- Correct Eddy-Viscosity and related properties 00135 void correct(const tmp<volTensorField>& gradU); 00136 00137 //- Read turbulenceProperties dictionary 00138 bool read(); 00139 }; 00140 00141 00142 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // 00143 00144 } // End namespace LESmodels 00145 } // End namespace Foam 00146 00147 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // 00148 00149 #endif 00150 00151 // ************************************************************************* //