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

   1 /*---------------------------------------------------------------------------*\
   2   =========                 |
   3   \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   4    \\    /   O peration     |
   5     \\  /    A nd           | Copyright (C) 2011 OpenFOAM Foundation
   6      \\/     M anipulation  |
   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
  13     the Free Software Foundation, either version 3 of the License, or
  14     (at your 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, see <http://www.gnu.org/licenses/>.
  23
  24 \*---------------------------------------------------------------------------*/
  25
  26 #include "BirdCarreau.H"
  27 #include "addToRunTimeSelectionTable.H"
  28 #include "surfaceFields.H"
  29
  30 // * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //
  31
  32 namespace Foam
  33 {
  34 namespace viscosityModels
  35 {
  36     defineTypeNameAndDebug(BirdCarreau, 0);
  37     addToRunTimeSelectionTable
  38     (
  39         viscosityModel,
  40         BirdCarreau,
  41         dictionary
  42     );
  43 }
  44 }
  45
  46
  47 // * * * * * * * * * * * * Private Member Functions  * * * * * * * * * * * * //
  48
  49 Foam::tmp<Foam::volScalarField>
  50 Foam::viscosityModels::BirdCarreau::calcNu() const
  51 {
  52     return
  53         nuInf_
  54       + (nu0_ - nuInf_)
  55        *pow(scalar(1) + sqr(k_*strainRate()), (n_ - 1.0)/2.0);
  56 }
  57
  58
  59 // * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //
  60
  61 Foam::viscosityModels::BirdCarreau::BirdCarreau
  62 (
  63     const word& name,
  64     const dictionary& viscosityProperties,
  65     const volVectorField& U,
  66     const surfaceScalarField& phi
  67 )
  68 :
  69     viscosityModel(name, viscosityProperties, U, phi),
  70     BirdCarreauCoeffs_(viscosityProperties.subDict(typeName + "Coeffs")),
  71     nu0_(BirdCarreauCoeffs_.lookup("nu0")),
  72     nuInf_(BirdCarreauCoeffs_.lookup("nuInf")),
  73     k_(BirdCarreauCoeffs_.lookup("k")),
  74     n_(BirdCarreauCoeffs_.lookup("n")),
  75     nu_
  76     (
  77         IOobject
  78         (
  79             "nu",
  80             U_.time().timeName(),
  81             U_.db(),
  82             IOobject::NO_READ,
  83             IOobject::AUTO_WRITE
  84         ),
  85         calcNu()
  86     )
  87 {}
  88
  89
  90 // * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * * //
  91
  92 bool Foam::viscosityModels::BirdCarreau::read
  93 (
  94     const dictionary& viscosityProperties
  95 )
  96 {
  97     viscosityModel::read(viscosityProperties);
  98
  99     BirdCarreauCoeffs_ = viscosityProperties.subDict(typeName + "Coeffs");
 100
 101     BirdCarreauCoeffs_.lookup("nu0") >> nu0_;
 102     BirdCarreauCoeffs_.lookup("nuInf") >> nuInf_;
 103     BirdCarreauCoeffs_.lookup("k") >> k_;
 104     BirdCarreauCoeffs_.lookup("n") >> n_;
 105
 106     return true;
 107 }
 108
 109
 110 // ************************************************************************* //