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dynOneEqEddy.H

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00005     \\  /    A nd           | Copyright (C) 1991-2005 OpenCFD Ltd.
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00009     This file is part of OpenFOAM.
00010 
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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     dynOneEqEddy
00027 
00028 Description
00029 <pre>
00030     One Equation Eddy Viscosity Model
00031     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
00032     Eddy viscosity SGS model using a modeled balance equation to simulate
00033     the behaviour of k, hence,
00034 
00035         d/dt(k) + div(U*k) - div(nuSgs*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     dynOneEqEddy.C
00052 
00053 \*---------------------------------------------------------------------------*/
00054 
00055 #ifndef dynOneEqEddy_H
00056 #define dynOneEqEddy_H
00057 
00058 #include "GenEddyVisc.H"
00059 #include "LESfilter.H"
00060 
00061 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
00062 
00063 namespace Foam
00064 {
00065 namespace LESmodels
00066 {
00067 
00068 /*---------------------------------------------------------------------------*\
00069                            Class dynOneEqEddy Declaration
00070 \*---------------------------------------------------------------------------*/
00071 
00072 class dynOneEqEddy
00073 :
00074     public GenEddyVisc
00075 {
00076     // Private data
00077 
00078         volScalarField k_;
00079 
00080         autoPtr<LESfilter> filterPtr_;
00081         LESfilter& filter_;
00082 
00083 
00084     // Private Member Functions
00085 
00086         //- Calculate ck, ce by filtering the velocity field U.
00087         dimensionedScalar ck(const volTensorField& D) const;
00088         dimensionedScalar ce(const volTensorField& D) const;
00089 
00090         // Disallow default bitwise copy construct and assignment
00091         dynOneEqEddy(const dynOneEqEddy&);
00092         dynOneEqEddy& operator=(const dynOneEqEddy&);
00093 
00094 
00095 public:
00096 
00097     //- Runtime type information
00098     TypeName("dynOneEqEddy");
00099 
00100     // Constructors
00101 
00102         //- Constructor from components
00103         dynOneEqEddy
00104         (
00105             const volVectorField& U,
00106             const surfaceScalarField& phi,
00107             transportModel& transport
00108         );
00109 
00110 
00111     // Destructor
00112 
00113         ~dynOneEqEddy();
00114 
00115 
00116     // Member Functions
00117 
00118         //- Return SGS kinetic energy
00119         tmp<volScalarField> k() const
00120         {
00121             return k_;
00122         }
00123 
00124         //- Return the effective diffusivity for k
00125         tmp<volScalarField> DkEff() const
00126         {
00127             return tmp<volScalarField> 
00128             (
00129                 new volScalarField("DkEff", nuSgs_ + nu())
00130             );
00131         }
00132 
00133         //- Correct Eddy-Viscosity and related properties
00134         void correct(const tmp<volTensorField>& gradU);
00135 
00136         //- Read turbulenceProperties dictionary
00137         bool read();
00138 };
00139 
00140 
00141 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
00142 
00143 } // End namespace LESmodels
00144 } // End namespace Foam
00145 
00146 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
00147 
00148 #endif
00149 
00150 // ************************************************************************* //
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