src/finiteVolume/interpolation/surfaceInterpolation/schemes/quadraticLinearUpwindFit/quadraticLinearUpwindFitPolynomial.H

   1 /*---------------------------------------------------------------------------*\
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   5     \\  /    A nd           | Copyright (C) 1991-2009 OpenCFD Ltd.
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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 Class
  26     Foam::quadraticLinearUpwindFitPolynomial
  27
  28 Description
  29     Quadratic polynomial for upwind biased interpolation fitting.
  30
  31     Can be used with the UpwindFit scheme to create a quadratic surface
  32     interpolation scheme
  33
  34 \*---------------------------------------------------------------------------*/
  35
  36 #ifndef quadraticLinearUpwindFitPolynomial_H
  37 #define quadraticLinearUpwindFitPolynomial_H
  38
  39 #include "vector.H"
  40
  41 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
  42
  43 namespace Foam
  44 {
  45
  46 /*---------------------------------------------------------------------------*\
  47                  Class quadraticLinearUpwindFitPolynomial Declaration
  48 \*---------------------------------------------------------------------------*/
  49
  50 class quadraticLinearUpwindFitPolynomial
  51 {
  52 public:
  53
  54     // Member functions
  55
  56         static label nTerms(const direction dim)
  57         {
  58             return
  59             (
  60                 dim == 1 ? 3 :
  61                 dim == 2 ? 5 :
  62                 dim == 3 ? 7 : 0
  63             );
  64         }
  65
  66         static void addCoeffs
  67         (
  68             scalar* coeffs,
  69             const vector& d,
  70             const scalar weight,
  71             const direction dim
  72         )
  73         {
  74             register label curIdx = 0;
  75
  76             coeffs[curIdx++] = weight;
  77             coeffs[curIdx++] = weight*d.x();
  78             coeffs[curIdx++] = weight*sqr(d.x());
  79
  80             if (dim >= 2)
  81             {
  82                 coeffs[curIdx++] = weight*d.y();
  83                 coeffs[curIdx++] = weight*d.x()*d.y();
  84             }
  85             if (dim == 3)
  86             {
  87                 coeffs[curIdx++] = weight*d.z();
  88                 coeffs[curIdx++] = weight*d.x()*d.z();
  89             }
  90         }
  91 };
  92
  93
  94 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
  95
  96 } // End namespace Foam
  97
  98 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
  99
 100 #endif
 101
 102 // ************************************************************************* //