quadraticLinearFitPolynomial.H
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1 /*---------------------------------------------------------------------------*\
2  ========= |
3  \\ / F ield | OpenFOAM: The Open Source CFD Toolbox
4  \\ / O peration |
5  \\ / A nd | Copyright (C) 2011-2015 OpenFOAM Foundation
6  \\/ M anipulation |
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23 
24 Class
25  Foam::quadraticLinearFitPolynomial
26 
27 Description
28  Quadratic/linear polynomial for interpolation fitting:
29  quadratic normal to the face,
30  linear in the plane of the face for consistency with 2nd-order Gauss.
31 
32  Can be used with the CentredFit scheme to create a quadratic surface
33  interpolation scheme
34 
35 \*---------------------------------------------------------------------------*/
36 
37 #ifndef quadraticLinearFitPolynomial_H
38 #define quadraticLinearFitPolynomial_H
39 
40 #include "vector.H"
41 
42 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
43 
44 namespace Foam
45 {
46 
47 /*---------------------------------------------------------------------------*\
48  Class quadraticLinearFitPolynomial Declaration
49 \*---------------------------------------------------------------------------*/
50 
52 {
53 public:
54 
55  // Member functions
56 
57  static label nTerms(const direction dim)
58  {
59  return
60  (
61  dim == 1 ? 3 :
62  dim == 2 ? 5 :
63  dim == 3 ? 7 : 0
64  );
65  }
66 
67  static void addCoeffs
68  (
69  scalar* coeffs,
70  const vector& d,
71  const scalar weight,
72  const direction dim
73  )
74  {
75  label curIdx = 0;
76 
77  coeffs[curIdx++] = weight;
78  coeffs[curIdx++] = weight*d.x();
79  coeffs[curIdx++] = weight*sqr(d.x());
80 
81  if (dim >= 2)
82  {
83  coeffs[curIdx++] = weight*d.y();
84  coeffs[curIdx++] = weight*d.x()*d.y();
85  }
86  if (dim == 3)
87  {
88  coeffs[curIdx++] = weight*d.z();
89  coeffs[curIdx++] = weight*d.x()*d.z();
90  }
91  }
92 };
93 
94 
95 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
96 
97 } // End namespace Foam
98 
99 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
100 
101 #endif
102 
103 // ************************************************************************* //
unsigned char direction
Definition: direction.H:43
static label nTerms(const direction dim)
static void addCoeffs(scalar *coeffs, const vector &d, const scalar weight, const direction dim)
Quadratic/linear polynomial for interpolation fitting: quadratic normal to the face, linear in the plane of the face for consistency with 2nd-order Gauss.
intWM_LABEL_SIZE_t label
A label is an int32_t or int64_t as specified by the pre-processor macro WM_LABEL_SIZE.
Definition: label.H:59
Namespace for OpenFOAM.
const Cmpt & y() const
Definition: VectorI.H:71
const Cmpt & x() const
Definition: VectorI.H:65
const Cmpt & z() const
Definition: VectorI.H:77
dimensionedSymmTensor sqr(const dimensionedVector &dv)