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

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