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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 Smagorinsky 00027 00028 Description 00029 <pre> 00030 The Isochoric Smagorinsky Model 00031 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 00032 Algebraic eddy viscosity SGS model founded on the assumption that 00033 local equilibrium prevails, hence 00034 00035 B = 2/3*k*I - 2*nuEff*dev(D) 00036 00037 where 00038 00039 D = symm(grad(U)); 00040 k = (2*ck/ce)*delta^2*||D||^2 00041 nuSgs = ck*sqrt(k)*delta 00042 nuEff = nuSgs + nu 00043 </pre> 00044 00045 SourceFiles 00046 Smagorinsky.C 00047 00048 \*---------------------------------------------------------------------------*/ 00049 00050 #ifndef Smagorinsky_H 00051 #define Smagorinsky_H 00052 00053 #include "GenEddyVisc.H" 00054 00055 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // 00056 00057 namespace Foam 00058 { 00059 namespace LESmodels 00060 { 00061 00062 /*---------------------------------------------------------------------------*\ 00063 Class Smagorinsky Declaration 00064 \*---------------------------------------------------------------------------*/ 00065 00066 class Smagorinsky 00067 : 00068 public GenEddyVisc 00069 { 00070 // Private data 00071 00072 dimensionedScalar ck_; 00073 00074 00075 // Private Member Functions 00076 00077 // Disallow default bitwise copy construct and assignment 00078 Smagorinsky(const Smagorinsky&); 00079 Smagorinsky& operator=(const Smagorinsky&); 00080 00081 00082 public: 00083 00084 //- Runtime type information 00085 TypeName("Smagorinsky"); 00086 00087 // Constructors 00088 00089 //- Construct from components 00090 Smagorinsky 00091 ( 00092 const volVectorField& U, 00093 const surfaceScalarField& phi, 00094 transportModel& transport 00095 ); 00096 00097 00098 // Destructor 00099 00100 ~Smagorinsky() 00101 {} 00102 00103 00104 // Member Functions 00105 00106 //- Return SGS kinetic energy 00107 // calculated from the given velocity gradient 00108 tmp<volScalarField> k(const tmp<volTensorField>& gradU) const 00109 { 00110 return (2.0*ck_/ce_)*sqr(delta())*magSqr(dev(symm(gradU))); 00111 } 00112 00113 //- Return SGS kinetic energy 00114 tmp<volScalarField> k() const 00115 { 00116 return k(fvc::grad(U())); 00117 } 00118 00119 00120 //- Correct Eddy-Viscosity and related properties 00121 virtual void correct(const tmp<volTensorField>& gradU); 00122 00123 //- Read turbulenceProperties dictionary 00124 virtual bool read(); 00125 }; 00126 00127 00128 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // 00129 00130 } // End namespace LESmodels 00131 } // End namespace Foam 00132 00133 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // 00134 00135 #endif 00136 00137 // ************************************************************************* //