src/transportModels/incompressible/viscosityModels/BirdCarreau/BirdCarreau.C

   1 /*---------------------------------------------------------------------------*\
   2   =========                 |
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   7 -------------------------------------------------------------------------------
   8 License
   9     This file is part of OpenFOAM.
  10
  11     OpenFOAM is free software; you can redistribute it and/or modify it
  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
  14     option) any later version.
  15
  16     OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
  17     ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  18     FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  19     for more details.
  20
  21     You should have received a copy of the GNU General Public License
  22     along with OpenFOAM; if not, write to the Free Software Foundation,
  23     Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  24
  25 \*---------------------------------------------------------------------------*/
  26
  27 #include "BirdCarreau.H"
  28 #include "addToRunTimeSelectionTable.H"
  29 #include "surfaceFields.H"
  30
  31 // * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //
  32
  33 namespace Foam
  34 {
  35 namespace viscosityModels
  36 {
  37     defineTypeNameAndDebug(BirdCarreau, 0);
  38     addToRunTimeSelectionTable
  39     (
  40         viscosityModel,
  41         BirdCarreau,
  42         dictionary
  43     );
  44 }
  45 }
  46
  47
  48 // * * * * * * * * * * * * Private Member Functions  * * * * * * * * * * * * //
  49
  50 Foam::tmp<Foam::volScalarField>
  51 Foam::viscosityModels::BirdCarreau::calcNu() const
  52 {
  53     return
  54         nuInf_
  55       + (nu0_ - nuInf_)
  56        *pow(scalar(1) + sqr(k_*strainRate()), (n_ - 1.0)/2.0);
  57 }
  58
  59
  60 // * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //
  61
  62 Foam::viscosityModels::BirdCarreau::BirdCarreau
  63 (
  64     const word& name,
  65     const dictionary& viscosityProperties,
  66     const volVectorField& U,
  67     const surfaceScalarField& phi
  68 )
  69 :
  70     viscosityModel(name, viscosityProperties, U, phi),
  71     BirdCarreauCoeffs_(viscosityProperties.subDict(typeName + "Coeffs")),
  72     nu0_(BirdCarreauCoeffs_.lookup("nu0")),
  73     nuInf_(BirdCarreauCoeffs_.lookup("nuInf")),
  74     k_(BirdCarreauCoeffs_.lookup("k")),
  75     n_(BirdCarreauCoeffs_.lookup("n")),
  76     nu_
  77     (
  78         IOobject
  79         (
  80             "nu",
  81             U_.time().timeName(),
  82             U_.db(),
  83             IOobject::NO_READ,
  84             IOobject::AUTO_WRITE
  85         ),
  86         calcNu()
  87     )
  88 {}
  89
  90
  91 // * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * * //
  92
  93 bool Foam::viscosityModels::BirdCarreau::read
  94 (
  95     const dictionary& viscosityProperties
  96 )
  97 {
  98     viscosityModel::read(viscosityProperties);
  99
 100     BirdCarreauCoeffs_ = viscosityProperties.subDict(typeName + "Coeffs");
 101
 102     BirdCarreauCoeffs_.lookup("nu0") >> nu0_;
 103     BirdCarreauCoeffs_.lookup("nuInf") >> nuInf_;
 104     BirdCarreauCoeffs_.lookup("k") >> k_;
 105     BirdCarreauCoeffs_.lookup("n") >> n_;
 106
 107     return true;
 108 }
 109
 110
 111 // ************************************************************************* //