quadrature_clough_2D.C
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1 // The libMesh Finite Element Library.
2 // Copyright (C) 2002-2014 Benjamin S. Kirk, John W. Peterson, Roy H. Stogner
3 
4 // This library is free software; you can redistribute it and/or
5 // modify it under the terms of the GNU Lesser General Public
6 // License as published by the Free Software Foundation; either
7 // version 2.1 of the License, or (at your option) any later version.
8 
9 // This library is distributed in the hope that it will be useful,
10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 // Lesser General Public License for more details.
13 
14 // You should have received a copy of the GNU Lesser General Public
15 // License along with this library; if not, write to the Free Software
16 // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
17 
18 
19 
20 // Local includes
23 
24 namespace libMesh
25 {
26 
27 
28 void QClough::init_2D(const ElemType type_in,
29  unsigned int p)
30 {
31 #if LIBMESH_DIM > 1
32  QGauss gauss_rule(2, _order);
33  gauss_rule.init(TRI6, p);
34 
35  //-----------------------------------------------------------------------
36  // 2D quadrature rules
37  switch (type_in)
38  {
39 
40  //---------------------------------------------
41  // Triangle quadrature rules
42  case TRI3:
43  case TRI6:
44  {
45  std::vector<Point> &gausspoints = gauss_rule.get_points();
46  std::vector<Real> &gaussweights = gauss_rule.get_weights();
47  std::size_t numgausspts = gausspoints.size();
48  _points.resize(numgausspts*3);
49  _weights.resize(numgausspts*3);
50  for (std::size_t i = 0; i != numgausspts; ++i)
51  {
52  _points[3*i](0) = gausspoints[i](0) +
53  gausspoints[i](1) / 3.;
54  _points[3*i](1) = gausspoints[i](1) / 3.;
55  _points[3*i+1](0) = gausspoints[i](1) / 3.;
56  _points[3*i+1](1) = gausspoints[i](0) +
57  gausspoints[i](1) / 3.;
58  _points[3*i+2](0) = 1./3. +
59  gausspoints[i](0) * 2./3. -
60  gausspoints[i](1) / 3.;
61  _points[3*i+2](1) = 1./3. -
62  gausspoints[i](0) / 3. +
63  gausspoints[i](1) * 2./3.;
64  _weights[3*i] = gaussweights[i] / 3.;
65  _weights[3*i+1] = _weights[3*i];
66  _weights[3*i+2] = _weights[3*i];
67  }
68  return;
69  }
70 
71 
72  //---------------------------------------------
73  // Unsupported type
74  default:
75  {
76  libMesh::err << "Element type not supported!:" << type_in << std::endl;
77  libmesh_error();
78  }
79  }
80 
81  libmesh_error();
82 
83  return;
84 
85 #endif
86 }
87 
88 } // namespace libMesh

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Last modified: February 07 2014 16:57:06 UTC

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