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src
turbulenceModels
incompressible
LES
DeardorffDiffStress
DeardorffDiffStress.H
Go to the documentation of this file.
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/*---------------------------------------------------------------------------*\
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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) 1991-2010 OpenCFD Ltd.
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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::incompressible::LESModels::DeardorffDiffStress
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Description
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Differential SGS Stress Equation Model for incompressible flows
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The DSEM uses a model version of the full balance equation for the SGS
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stress tensor to simulate the behaviour of B.
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Thus,
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@verbatim
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d/dt(B) + div(U*B) - div(nuSgs*grad(B))
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=
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P - c1*epsilon/k*B - 0.667*(1 - c1)*epsilon*I - c2*(P - 0.333*trP*I)
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where
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k = 0.5*tr(B),
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epsilon = ce*k^3/2/delta,
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epsilon/k = ce*k^1/2/delta
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P = -(B'L + L'B)
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nuSgs = ck*sqrt(k)*delta
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nuEff = nuSgs + nu
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@endverbatim
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SourceFiles
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DeardorffDiffStress.C
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\*---------------------------------------------------------------------------*/
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#ifndef DeardorffDiffStress_H
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#define DeardorffDiffStress_H
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#include <
incompressibleLESModels/GenSGSStress.H
>
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// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
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namespace
Foam
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{
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namespace
incompressible
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{
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namespace
LESModels
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{
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/*---------------------------------------------------------------------------*\
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Class DeardorffDiffStress Declaration
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\*---------------------------------------------------------------------------*/
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class
DeardorffDiffStress
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:
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public
GenSGSStress
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{
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// Private data
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dimensionedScalar
ck_;
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dimensionedScalar
cm_;
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// Private Member Functions
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//- Update sub-grid scale fields
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void
updateSubGridScaleFields(
const
volScalarField
&
K
);
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// Disallow default bitwise copy construct and assignment
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DeardorffDiffStress
(
const
DeardorffDiffStress
&);
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DeardorffDiffStress
& operator=(
const
DeardorffDiffStress
&);
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public
:
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//- Runtime type information
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TypeName
(
"DeardorffDiffStress"
);
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// Constructors
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//- Construct from components
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DeardorffDiffStress
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(
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const
volVectorField
&
U
,
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const
surfaceScalarField
&
phi
,
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transportModel
&
transport
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);
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//- Destructor
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virtual
~DeardorffDiffStress
()
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{}
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// Member Functions
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//- Return the effective diffusivity for B
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tmp<volScalarField>
DBEff
()
const
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{
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return
tmp<volScalarField>
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(
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new
volScalarField
(
"DBEff"
,
nuSgs_
+
nu
())
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);
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}
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//- Correct Eddy-Viscosity and related properties
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virtual
void
correct
(
const
tmp<volTensorField>
& gradU);
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//- Read LESProperties dictionary
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virtual
bool
read
();
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};
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// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
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}
// End namespace LESModels
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}
// End namespace incompressible
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}
// End namespace Foam
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// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
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#endif
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// ************************ vim: set sw=4 sts=4 et: ************************ //