1 /*---------------------------------------------------------------------------*\
3 \\ / F ield | OpenFOAM: The Open Source CFD Toolbox
5 \\ / A nd | Copyright (C) 1991-2009 OpenCFD Ltd.
7 -------------------------------------------------------------------------------
9 This file is part of OpenFOAM.
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12 under the terms of the GNU General Public License as published by the
13 Free Software Foundation; either version 2 of the License, or (at your
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23 Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
25 \*---------------------------------------------------------------------------*/
27 #include "DeardorffDiffStress.H"
28 #include "addToRunTimeSelectionTable.H"
30 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
34 namespace compressible
39 // * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //
41 defineTypeNameAndDebug(DeardorffDiffStress, 0);
42 addToRunTimeSelectionTable(LESModel, DeardorffDiffStress, dictionary);
45 // * * * * * * * * * * * * * Private Member Functions * * * * * * * * * * * //
47 void DeardorffDiffStress::updateSubGridScaleFields(const volScalarField& K)
49 muSgs_ = ck_*rho()*sqrt(K)*delta();
50 muSgs_.correctBoundaryConditions();
52 alphaSgs_ = muSgs_/Prt_;
53 alphaSgs_.correctBoundaryConditions();
57 // * * * * * * * * * * * * * * * * Constructors * * * * * * * * * * * * * * //
59 DeardorffDiffStress::DeardorffDiffStress
61 const volScalarField& rho,
62 const volVectorField& U,
63 const surfaceScalarField& phi,
64 const basicThermo& thermoPhysicalModel
67 LESModel(typeName, rho, U, phi, thermoPhysicalModel),
68 GenSGSStress(rho, U, phi, thermoPhysicalModel),
72 dimensioned<scalar>::lookupOrAddToDict
81 dimensioned<scalar>::lookupOrAddToDict
89 updateSubGridScaleFields(0.5*tr(B_));
95 // * * * * * * * * * * * * * * * Member Functions * * * * * * * * * * * * * //
97 void DeardorffDiffStress::correct(const tmp<volTensorField>& tgradU)
99 const volTensorField& gradU = tgradU();
101 GenSGSStress::correct(gradU);
103 volSymmTensorField D = symm(gradU);
105 volSymmTensorField P = -rho()*twoSymm(B_ & gradU);
107 volScalarField K = 0.5*tr(B_);
112 + fvm::div(phi(), B_)
113 - fvm::laplacian(DBEff(), B_)
114 + fvm::Sp(cm_*rho()*sqrt(K)/delta(), B_)
118 - (2*ce_ - 0.667*cm_)*I*rho()*epsilon()
122 // Bounding the component kinetic energies
126 B_[celli].component(symmTensor::XX) =
127 max(B_[celli].component(symmTensor::XX), 1.0e-10);
128 B_[celli].component(symmTensor::YY) =
129 max(B_[celli].component(symmTensor::YY), 1.0e-10);
130 B_[celli].component(symmTensor::ZZ) =
131 max(B_[celli].component(symmTensor::ZZ), 1.0e-10);
137 updateSubGridScaleFields(K);
141 bool DeardorffDiffStress::read()
143 if (GenSGSStress::read())
145 ck_.readIfPresent(coeffDict());
146 cm_.readIfPresent(coeffDict());
157 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
159 } // End namespace LESModels
160 } // End namespace compressible
161 } // End namespace Foam
163 // ************************************************************************* //