src/transportModels/incompressible/viscosityModels/powerLaw/powerLaw.C

   1 /*---------------------------------------------------------------------------*\
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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
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  23     Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  24
  25 \*---------------------------------------------------------------------------*/
  26
  27 #include "powerLaw.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(powerLaw, 0);
  38
  39     addToRunTimeSelectionTable
  40     (
  41         viscosityModel,
  42         powerLaw,
  43         dictionary
  44     );
  45 }
  46 }
  47
  48
  49 // * * * * * * * * * * * * Private Member Functions  * * * * * * * * * * * * //
  50
  51 Foam::tmp<Foam::volScalarField>
  52 Foam::viscosityModels::powerLaw::calcNu() const
  53 {
  54     return max
  55     (
  56         nuMin_,
  57         min
  58         (
  59             nuMax_,
  60             k_*pow
  61             (
  62                 max
  63                 (
  64                     dimensionedScalar("one", dimTime, 1.0)*strainRate(),
  65                     dimensionedScalar("VSMALL", dimless, VSMALL)
  66                 ),
  67                 n_.value() - scalar(1.0)
  68             )
  69         )
  70     );
  71 }
  72
  73
  74 // * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //
  75
  76 Foam::viscosityModels::powerLaw::powerLaw
  77 (
  78     const word& name,
  79     const dictionary& viscosityProperties,
  80     const volVectorField& U,
  81     const surfaceScalarField& phi
  82 )
  83 :
  84     viscosityModel(name, viscosityProperties, U, phi),
  85     powerLawCoeffs_(viscosityProperties.subDict(typeName + "Coeffs")),
  86     k_(powerLawCoeffs_.lookup("k")),
  87     n_(powerLawCoeffs_.lookup("n")),
  88     nuMin_(powerLawCoeffs_.lookup("nuMin")),
  89     nuMax_(powerLawCoeffs_.lookup("nuMax")),
  90     nu_
  91     (
  92         IOobject
  93         (
  94             name,
  95             U_.time().timeName(),
  96             U_.db(),
  97             IOobject::NO_READ,
  98             IOobject::AUTO_WRITE
  99         ),
 100         calcNu()
 101     )
 102 {}
 103
 104
 105 // * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * * //
 106
 107 bool Foam::viscosityModels::powerLaw::read
 108 (
 109     const dictionary& viscosityProperties
 110 )
 111 {
 112     viscosityModel::read(viscosityProperties);
 113
 114     powerLawCoeffs_ = viscosityProperties.subDict(typeName + "Coeffs");
 115
 116     powerLawCoeffs_.lookup("k") >> k_;
 117     powerLawCoeffs_.lookup("n") >> n_;
 118     powerLawCoeffs_.lookup("nuMin") >> nuMin_;
 119     powerLawCoeffs_.lookup("nuMax") >> nuMax_;
 120
 121     return true;
 122 }
 123
 124
 125 // ************************************************************************* //