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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 oneEqEddy 00027 00028 Description 00029 <pre> 00030 One Equation Eddy Viscosity Model 00031 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 00032 Eddy viscosity SGS model using a modeled balance equation to simulate the 00033 behaviour of k, hence, 00034 00035 d/dt(k) + div(U*k) - div(nuEff*grad(k)) 00036 = 00037 -B*L - ce*k^3/2/delta 00038 00039 and 00040 00041 B = 2/3*k*I - 2*nuEff*dev(D) 00042 00043 where 00044 00045 D = symm(grad(U)); 00046 nuSgs = ck*sqrt(k)*delta 00047 nuEff = nuSgs + nu 00048 </pre> 00049 00050 SourceFiles 00051 oneEqEddy.C 00052 00053 \*---------------------------------------------------------------------------*/ 00054 00055 #ifndef oneEqEddy_H 00056 #define oneEqEddy_H 00057 00058 #include "GenEddyVisc.H" 00059 00060 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // 00061 00062 namespace Foam 00063 { 00064 namespace LESmodels 00065 { 00066 00067 /*---------------------------------------------------------------------------*\ 00068 Class oneEqEddy Declaration 00069 \*---------------------------------------------------------------------------*/ 00070 00071 class oneEqEddy 00072 : 00073 public GenEddyVisc 00074 { 00075 // Private data 00076 00077 volScalarField k_; 00078 00079 dimensionedScalar ck_; 00080 00081 00082 // Private Member Functions 00083 00084 // Disallow default bitwise copy construct and assignment 00085 oneEqEddy(const oneEqEddy&); 00086 oneEqEddy& operator=(const oneEqEddy&); 00087 00088 00089 public: 00090 00091 //- Runtime type information 00092 TypeName("oneEqEddy"); 00093 00094 // Constructors 00095 00096 //- Constructor from components 00097 oneEqEddy 00098 ( 00099 const volVectorField& U, 00100 const surfaceScalarField& phi, 00101 transportModel& transport 00102 ); 00103 00104 00105 // Destructor 00106 00107 ~oneEqEddy() 00108 {} 00109 00110 00111 // Member Functions 00112 00113 //- Return SGS kinetic energy 00114 tmp<volScalarField> k() const 00115 { 00116 return k_; 00117 } 00118 00119 //- Return the effective diffusivity for k 00120 tmp<volScalarField> DkEff() const 00121 { 00122 return tmp<volScalarField> 00123 ( 00124 new volScalarField("DkEff", nuSgs_ + nu()) 00125 ); 00126 } 00127 00128 //- Correct Eddy-Viscosity and related properties 00129 void correct(const tmp<volTensorField>& gradU); 00130 00131 //- Read turbulenceProperties dictionary 00132 bool read(); 00133 }; 00134 00135 00136 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // 00137 00138 } // End namespace LESmodels 00139 } // End namespace Foam 00140 00141 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // 00142 00143 #endif 00144 00145 // ************************************************************************* //