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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 LRRDiffStress 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(B) + div(U*B) - div(nuSgs*grad(B)) 00036 = 00037 P - c1*e/k*B - 0.667*(1 - c1)*e*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 = -(B'L + L'B) 00045 nuEff = ck*sqrt(k)*delta + nu 00046 00047 This version from Launder, Rece & Rodi 1975 00048 </pre> 00049 00050 SourceFiles 00051 LRRDiffStress.C 00052 00053 \*---------------------------------------------------------------------------*/ 00054 00055 #ifndef LRRDiffStress_H 00056 #define LRRDiffStress_H 00057 00058 #include "GenSGSStress.H" 00059 00060 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // 00061 00062 namespace Foam 00063 { 00064 namespace LESmodels 00065 { 00066 00067 /*---------------------------------------------------------------------------*\ 00068 Class LRRDiffStress Declaration 00069 \*---------------------------------------------------------------------------*/ 00070 00071 class LRRDiffStress 00072 : 00073 public GenSGSStress 00074 { 00075 // Private data 00076 00077 dimensionedScalar ck_; 00078 dimensionedScalar c1_; 00079 dimensionedScalar c2_; 00080 00081 00082 // Private Member Functions 00083 00084 // Disallow default bitwise copy construct and assignment 00085 LRRDiffStress(const LRRDiffStress&); 00086 LRRDiffStress& operator=(const LRRDiffStress&); 00087 00088 00089 public: 00090 00091 //- Runtime type information 00092 TypeName("LRRDiffStress"); 00093 00094 // Constructors 00095 00096 //- Constructors from components 00097 LRRDiffStress 00098 ( 00099 const volVectorField& U, 00100 const surfaceScalarField& phi, 00101 transportModel& transport 00102 ); 00103 00104 00105 // Destructor 00106 00107 ~LRRDiffStress() 00108 {} 00109 00110 00111 // Member Functions 00112 00113 //- Return the effective diffusivity for B 00114 tmp<volScalarField> DBEff() const 00115 { 00116 return tmp<volScalarField> 00117 ( 00118 new volScalarField("DBEff", nuSgs_ + nu()) 00119 ); 00120 } 00121 00122 //- Correct Eddy-Viscosity and related properties 00123 void correct(const tmp<volTensorField>& gradU); 00124 00125 //- Read turbulenceProperties dictionary 00126 bool read(); 00127 }; 00128 00129 00130 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // 00131 00132 } // End namespace LESmodels 00133 } // End namespace Foam 00134 00135 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // 00136 00137 #endif 00138 00139 // ************************************************************************* //