src/turbulenceModels/LES/incompressible/spectEddyVisc/spectEddyVisc.C

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   8 License
   9     This file is part of OpenFOAM.
  10
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  13     Free Software Foundation; either version 2 of the License, or (at your
  14     option) any later version.
  15
  16     OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
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  19     for more details.
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  23     Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  24
  25 \*---------------------------------------------------------------------------*/
  26
  27 #include "spectEddyVisc.H"
  28 #include "addToRunTimeSelectionTable.H"
  29
  30 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
  31
  32 namespace Foam
  33 {
  34 namespace incompressible
  35 {
  36 namespace LESModels
  37 {
  38
  39 // * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //
  40
  41 defineTypeNameAndDebug(spectEddyVisc, 0);
  42 addToRunTimeSelectionTable(LESModel, spectEddyVisc, dictionary);
  43
  44 // * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //
  45
  46 // from components
  47 spectEddyVisc::spectEddyVisc
  48 (
  49     const volVectorField& U,
  50     const surfaceScalarField& phi,
  51     transportModel& transport
  52 )
  53 :
  54     LESModel(typeName, U, phi, transport),
  55     GenEddyVisc(U, phi, transport),
  56
  57
  58     cB_
  59     (
  60         dimensioned<scalar>::lookupOrAddToDict
  61         (
  62             "cB",
  63             coeffDict(),
  64             8.22
  65         )
  66     ),
  67     cK1_
  68     (
  69         dimensioned<scalar>::lookupOrAddToDict
  70         (
  71             "cK1",
  72             coeffDict(),
  73             0.83
  74         )
  75     ),
  76     cK2_
  77     (
  78         dimensioned<scalar>::lookupOrAddToDict
  79         (
  80             "cK2",
  81             coeffDict(),
  82             1.03
  83         )
  84     ),
  85     cK3_
  86     (
  87         dimensioned<scalar>::lookupOrAddToDict
  88         (
  89             "cK3",
  90             coeffDict(),
  91             4.75
  92         )
  93     ),
  94     cK4_
  95     (
  96         dimensioned<scalar>::lookupOrAddToDict
  97         (
  98             "cK4",
  99             coeffDict(),
 100             2.55
 101         )
 102     )
 103 {
 104     printCoeffs();
 105 }
 106
 107
 108 // * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //
 109
 110 tmp<volScalarField> spectEddyVisc::k() const
 111 {
 112     volScalarField Eps = 2*nuEff()*magSqr(symm(fvc::grad(U())));
 113
 114     return
 115         cK1_*pow(delta(), 2.0/3.0)*pow(Eps, 2.0/3.0)
 116         *exp(-cK2_*pow(delta(), -4.0/3.0)*nu()/pow(Eps, 1.0/3.0))
 117       - cK3_*pow(Eps*nu(), 1.0/2.0)
 118        *erfc(cK4_*pow(delta(), -2.0/3.0)*pow(Eps, -1.0/6.0));
 119 }
 120
 121
 122 void spectEddyVisc::correct(const tmp<volTensorField>& gradU)
 123 {
 124     GenEddyVisc::correct(gradU);
 125
 126     volScalarField Re = sqr(delta())*mag(symm(gradU))/nu();
 127
 128     for (label i=0; i<5; i++)
 129     {
 130         nuSgs_ =
 131             nu()
 132            /(
 133                scalar(1)
 134                - exp(-cB_*pow(nu()/(nuSgs_ + nu()), 1.0/3.0)*pow(Re, -2.0/3.0))
 135             );
 136     }
 137
 138     nuSgs_.correctBoundaryConditions();
 139 }
 140
 141
 142 bool spectEddyVisc::read()
 143 {
 144     if (GenEddyVisc::read())
 145     {
 146         cB_.readIfPresent(coeffDict());
 147         cK1_.readIfPresent(coeffDict());
 148         cK2_.readIfPresent(coeffDict());
 149         cK3_.readIfPresent(coeffDict());
 150         cK4_.readIfPresent(coeffDict());
 151
 152         return true;
 153     }
 154     else
 155     {
 156         return false;
 157     }
 158 }
 159
 160
 161 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 162
 163 } // End namespace LESModels
 164 } // End namespace incompressible
 165 } // End namespace Foam
 166
 167 // ************************************************************************* //