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src
turbulenceModels
incompressible
LES
spectEddyVisc
spectEddyVisc.C
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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\*---------------------------------------------------------------------------*/
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#include "
spectEddyVisc.H
"
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#include <
OpenFOAM/addToRunTimeSelectionTable.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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// * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //
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defineTypeNameAndDebug
(spectEddyVisc, 0);
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addToRunTimeSelectionTable
(LESModel, spectEddyVisc, dictionary);
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// * * * * * * * * * * * * * Private Member Functions * * * * * * * * * * * //
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void
spectEddyVisc::updateSubGridScaleFields(
const
volTensorField
& gradU)
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{
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volScalarField
Re
=
sqr
(
delta
())*
mag
(
symm
(gradU))/
nu
();
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for
(label i=0; i<5; i++)
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{
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nuSgs_
=
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nu
()
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/(
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scalar(1)
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-
exp
(-cB_*
pow
(
nu
()/(
nuSgs_
+
nu
()), 1.0/3.0)*
pow
(Re, -2.0/3.0))
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);
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}
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nuSgs_
.
correctBoundaryConditions
();
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}
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// * * * * * * * * * * * * * * * * Constructors * * * * * * * * * * * * * * //
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spectEddyVisc::spectEddyVisc
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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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:
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LESModel(typeName, U, phi, transport),
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GenEddyVisc
(U, phi, transport),
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cB_
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(
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dimensioned<scalar>::lookupOrAddToDict
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(
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"cB"
,
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coeffDict_,
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8.22
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)
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),
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cK1_
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(
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dimensioned<scalar>::lookupOrAddToDict
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(
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"cK1"
,
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coeffDict_,
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0.83
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)
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),
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cK2_
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(
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dimensioned<scalar>::lookupOrAddToDict
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(
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"cK2"
,
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coeffDict_,
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1.03
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)
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),
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cK3_
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(
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dimensioned<scalar>::lookupOrAddToDict
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(
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"cK3"
,
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coeffDict_,
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4.75
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)
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),
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cK4_
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(
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dimensioned<scalar>::lookupOrAddToDict
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(
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"cK4"
,
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coeffDict_,
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2.55
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)
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)
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{
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printCoeffs();
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updateSubGridScaleFields(
fvc::grad
(U));
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}
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// * * * * * * * * * * * * * * * Member Functions * * * * * * * * * * * * * //
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tmp<volScalarField>
spectEddyVisc::k
()
const
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{
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volScalarField
eps = 2*
nuEff
()*
magSqr
(
symm
(
fvc::grad
(
U
())));
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return
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cK1_*
pow
(
delta
()*eps, 2.0/3.0)
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*
exp
(-cK2_*
pow
(
delta
(), -4.0/3.0)*
nu
()/
pow
(eps, 1.0/3.0))
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- cK3_*
sqrt
(eps*
nu
())
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*
erfc
(cK4_*
pow
(
delta
(), -2.0/3.0)*
sqrt
(
nu
())*
pow
(eps, -1.0/6.0));
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}
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void
spectEddyVisc::correct
(
const
tmp<volTensorField>
& gradU)
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{
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GenEddyVisc::correct
(gradU);
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updateSubGridScaleFields(gradU());
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}
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bool
spectEddyVisc::read
()
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{
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if
(
GenEddyVisc::read
())
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{
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cB_.
readIfPresent
(
coeffDict
());
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cK1_.
readIfPresent
(
coeffDict
());
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cK2_.
readIfPresent
(
coeffDict
());
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cK3_.
readIfPresent
(
coeffDict
());
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cK4_.
readIfPresent
(
coeffDict
());
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return
true
;
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}
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else
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{
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return
false
;
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}
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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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// ************************ vim: set sw=4 sts=4 et: ************************ //