184 lines
4.8 KiB
C++
184 lines
4.8 KiB
C++
/*---------------------------------------------------------------------------*\
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========= |
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\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
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\\ / O peration |
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\\ / A nd | Copyright (C) 2011-2016 OpenFOAM Foundation
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\\/ M anipulation |
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-------------------------------------------------------------------------------
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License
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This file is part of OpenFOAM.
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OpenFOAM is free software: you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License
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along with OpenFOAM. If not, see <http://www.gnu.org/licenses/>.
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Class
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Foam::LESModels::Smagorinsky
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Group
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grpLESTurbulence
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Description
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The Smagorinsky SGS model.
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Reference:
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\verbatim
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Smagorinsky, J. (1963).
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General circulation experiments with the primitive equations: I.
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The basic experiment*.
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Monthly weather review, 91(3), 99-164.
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\endverbatim
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The form of the Smagorinsky model implemented is obtained from the
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k-equation model assuming local equilibrium which provides estimates of both
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k and epsilon separate from the sub-grid scale viscosity:
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\verbatim
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B = 2/3*k*I - 2*nuSgs*dev(D)
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where
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D = symm(grad(U));
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k from D:B + Ce*k^3/2/delta = 0
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nuSgs = Ck*sqrt(k)*delta
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\endverbatim
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The default model coefficients are
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\verbatim
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SmagorinskyCoeffs
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{
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Ck 0.094;
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Ce 1.048;
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}
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\endverbatim
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See also
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Foam::LESModels::kEqn
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SourceFiles
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Smagorinsky.C
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\*---------------------------------------------------------------------------*/
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#ifndef Smagorinsky_H
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#define Smagorinsky_H
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#include "LESModel.H"
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#include "LESeddyViscosity.H"
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// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
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namespace Foam
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{
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namespace LESModels
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{
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/*---------------------------------------------------------------------------*\
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Class Smagorinsky Declaration
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\*---------------------------------------------------------------------------*/
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template<class BasicTurbulenceModel>
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class Smagorinsky
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:
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public LESeddyViscosity<BasicTurbulenceModel>
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{
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// Private Member Functions
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// Disallow default bitwise copy construct and assignment
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Smagorinsky(const Smagorinsky&);
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void operator=(const Smagorinsky&);
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protected:
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// Protected data
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dimensionedScalar Ck_;
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// Protected Member Functions
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//- Return SGS kinetic energy
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// calculated from the given velocity gradient
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tmp<volScalarField> k(const tmp<volTensorField>& gradU) const;
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//- Update the SGS eddy viscosity
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virtual void correctNut();
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public:
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typedef typename BasicTurbulenceModel::alphaField alphaField;
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typedef typename BasicTurbulenceModel::rhoField rhoField;
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typedef typename BasicTurbulenceModel::transportModel transportModel;
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//- Runtime type information
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TypeName("Smagorinsky");
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// Constructors
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//- Construct from components
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Smagorinsky
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(
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const alphaField& alpha,
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const rhoField& rho,
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const volVectorField& U,
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const surfaceScalarField& alphaRhoPhi,
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const surfaceScalarField& phi,
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const transportModel& transport,
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const word& propertiesName = turbulenceModel::propertiesName,
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const word& type = typeName
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);
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//- Destructor
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virtual ~Smagorinsky()
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{}
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// Member Functions
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//- Read model coefficients if they have changed
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virtual bool read();
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//- Return SGS kinetic energy
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virtual tmp<volScalarField> k() const
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{
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return k(fvc::grad(this->U_));
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}
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//- Return sub-grid disipation rate
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virtual tmp<volScalarField> epsilon() const;
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//- Correct Eddy-Viscosity and related properties
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virtual void correct();
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};
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// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
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} // End namespace LESModels
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} // End namespace Foam
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// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
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#ifdef NoRepository
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#include "Smagorinsky.C"
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#endif
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// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
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#endif
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// ************************************************************************* //
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