Reference documentation for deal.II version 9.4.0
fe_dgp.cc
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1// ---------------------------------------------------------------------
2//
3// Copyright (C) 2002 - 2020 by the deal.II authors
4//
5// This file is part of the deal.II library.
6//
7// The deal.II library is free software; you can use it, redistribute
8// it, and/or modify it under the terms of the GNU Lesser General
10// version 2.1 of the License, or (at your option) any later version.
11// The full text of the license can be found in the file LICENSE.md at
12// the top level directory of deal.II.
13//
14// ---------------------------------------------------------------------
15
16
17#include <deal.II/fe/fe_dgp.h>
19#include <deal.II/fe/fe_tools.h>
20
21#include <memory>
22#include <sstream>
23
24
26
27template <int dim, int spacedim>
28FE_DGP<dim, spacedim>::FE_DGP(const unsigned int degree)
29 : FE_Poly<dim, spacedim>(
30 PolynomialSpace<dim>(
31 Polynomials::Legendre::generate_complete_basis(degree)),
33 1,
34 degree,
35 FiniteElementData<dim>::L2),
36 std::vector<bool>(
37 FiniteElementData<dim>(get_dpo_vector(degree), 1, degree)
38 .n_dofs_per_cell(),
39 true),
41 FiniteElementData<dim>(get_dpo_vector(degree), 1, degree)
42 .n_dofs_per_cell(),
43 std::vector<bool>(1, true)))
44{
45 // Reinit the vectors of restriction and prolongation matrices to the right
46 // sizes
48 // Fill prolongation matrices with embedding operators
49 if (dim == spacedim)
50 {
52 // Fill restriction matrices with L2-projection
54 }
55}
56
57
58template <int dim, int spacedim>
59std::string
61{
62 // note that the FETools::get_fe_by_name function depends on the
63 // particular format of the string this function returns, so they have to be
64 // kept in sync
65
66 std::ostringstream namebuf;
67 namebuf << "FE_DGP<" << Utilities::dim_string(dim, spacedim) << ">("
68 << this->degree << ")";
69
70 return namebuf.str();
71}
72
73
74
75template <int dim, int spacedim>
76std::unique_ptr<FiniteElement<dim, spacedim>>
78{
79 return std::make_unique<FE_DGP<dim, spacedim>>(*this);
80}
81
82
83
84//---------------------------------------------------------------------------
85// Auxiliary functions
86//---------------------------------------------------------------------------
87
88
89template <int dim, int spacedim>
90std::vector<unsigned int>
92{
93 std::vector<unsigned int> dpo(dim + 1, 0U);
94 dpo[dim] = deg + 1;
95 for (unsigned int i = 1; i < dim; ++i)
96 {
97 dpo[dim] *= deg + 1 + i;
98 dpo[dim] /= i + 1;
99 }
100 return dpo;
101}
102
103
104
105template <int dim, int spacedim>
106void
108 const FiniteElement<dim, spacedim> &x_source_fe,
109 FullMatrix<double> & interpolation_matrix,
110 const unsigned int) const
111{
112 // this is only implemented, if the source FE is also a DGP element. in that
113 // case, both elements have no dofs on their faces and the face
114 // interpolation matrix is necessarily empty -- i.e. there isn't much we
115 // need to do here.
116 (void)interpolation_matrix;
118 using FEDGP = FE_DGP<dim, spacedim>;
119 AssertThrow((x_source_fe.get_name().find("FE_DGP<") == 0) ||
120 (dynamic_cast<const FEDGP *>(&x_source_fe) != nullptr),
121 typename FE::ExcInterpolationNotImplemented());
122
123 Assert(interpolation_matrix.m() == 0,
124 ExcDimensionMismatch(interpolation_matrix.m(), 0));
125 Assert(interpolation_matrix.n() == 0,
126 ExcDimensionMismatch(interpolation_matrix.n(), 0));
127}
128
129
130
131template <int dim, int spacedim>
132void
134 const FiniteElement<dim, spacedim> &x_source_fe,
135 const unsigned int,
136 FullMatrix<double> &interpolation_matrix,
137 const unsigned int) const
138{
139 // this is only implemented, if the source FE is also a DGP element. in that
140 // case, both elements have no dofs on their faces and the face
141 // interpolation matrix is necessarily empty -- i.e. there isn't much we
142 // need to do here.
143 (void)interpolation_matrix;
145 using FEDGP = FE_DGP<dim, spacedim>;
146 AssertThrow((x_source_fe.get_name().find("FE_DGP<") == 0) ||
147 (dynamic_cast<const FEDGP *>(&x_source_fe) != nullptr),
148 typename FE::ExcInterpolationNotImplemented());
149
150 Assert(interpolation_matrix.m() == 0,
151 ExcDimensionMismatch(interpolation_matrix.m(), 0));
152 Assert(interpolation_matrix.n() == 0,
153 ExcDimensionMismatch(interpolation_matrix.n(), 0));
154}
155
156
157
158template <int dim, int spacedim>
159bool
161{
162 return true;
163}
164
165
166
167template <int dim, int spacedim>
168std::vector<std::pair<unsigned int, unsigned int>>
170 const FiniteElement<dim, spacedim> &fe_other) const
171{
172 // there are no such constraints for DGP elements at all
173 if (dynamic_cast<const FE_DGP<dim, spacedim> *>(&fe_other) != nullptr)
174 return std::vector<std::pair<unsigned int, unsigned int>>();
175 else
176 {
177 Assert(false, ExcNotImplemented());
178 return std::vector<std::pair<unsigned int, unsigned int>>();
179 }
180}
181
182
183
184template <int dim, int spacedim>
185std::vector<std::pair<unsigned int, unsigned int>>
187 const FiniteElement<dim, spacedim> &fe_other) const
188{
189 // there are no such constraints for DGP elements at all
190 if (dynamic_cast<const FE_DGP<dim, spacedim> *>(&fe_other) != nullptr)
191 return std::vector<std::pair<unsigned int, unsigned int>>();
192 else
193 {
194 Assert(false, ExcNotImplemented());
195 return std::vector<std::pair<unsigned int, unsigned int>>();
196 }
197}
198
199
200
201template <int dim, int spacedim>
202std::vector<std::pair<unsigned int, unsigned int>>
204 const FiniteElement<dim, spacedim> &fe_other,
205 const unsigned int) const
206{
207 // there are no such constraints for DGP elements at all
208 if (dynamic_cast<const FE_DGP<dim, spacedim> *>(&fe_other) != nullptr)
209 return std::vector<std::pair<unsigned int, unsigned int>>();
210 else
211 {
212 Assert(false, ExcNotImplemented());
213 return std::vector<std::pair<unsigned int, unsigned int>>();
214 }
215}
216
217
218
219template <int dim, int spacedim>
222 const FiniteElement<dim, spacedim> &fe_other,
223 const unsigned int codim) const
224{
225 Assert(codim <= dim, ExcImpossibleInDim(dim));
226
227 // vertex/line/face domination
228 // ---------------------------
229 if (codim > 0)
230 // this is a discontinuous element, so by definition there will
231 // be no constraints wherever this element comes together with
232 // any other kind of element
234
235 // cell domination
236 // ---------------
237 if (const FE_DGP<dim, spacedim> *fe_dgp_other =
238 dynamic_cast<const FE_DGP<dim, spacedim> *>(&fe_other))
239 {
240 if (this->degree < fe_dgp_other->degree)
242 else if (this->degree == fe_dgp_other->degree)
244 else
246 }
247 else if (const FE_Nothing<dim> *fe_nothing =
248 dynamic_cast<const FE_Nothing<dim> *>(&fe_other))
249 {
250 if (fe_nothing->is_dominating())
252 else
253 // the FE_Nothing has no degrees of freedom and it is typically used
254 // in a context where we don't require any continuity along the
255 // interface
257 }
258
259 Assert(false, ExcNotImplemented());
261}
262
263
264
265template <int dim, int spacedim>
266bool
268 const unsigned int) const
269{
270 // all shape functions have support on all faces
271 return true;
272}
273
274
275
276template <int dim, int spacedim>
277std::pair<Table<2, bool>, std::vector<unsigned int>>
279{
280 Table<2, bool> constant_modes(1, this->n_dofs_per_cell());
281 constant_modes(0, 0) = true;
282 return std::pair<Table<2, bool>, std::vector<unsigned int>>(
283 constant_modes, std::vector<unsigned int>(1, 0));
284}
285
286
287
288template <int dim, int spacedim>
289std::size_t
291{
292 Assert(false, ExcNotImplemented());
293 return 0;
294}
295
296
297
298// explicit instantiations
299#include "fe_dgp.inst"
300
301
Definition: fe_dgp.h:310
virtual std::vector< std::pair< unsigned int, unsigned int > > hp_line_dof_identities(const FiniteElement< dim, spacedim > &fe_other) const override
Definition: fe_dgp.cc:186
virtual bool has_support_on_face(const unsigned int shape_index, const unsigned int face_index) const override
Definition: fe_dgp.cc:267
virtual std::pair< Table< 2, bool >, std::vector< unsigned int > > get_constant_modes() const override
Definition: fe_dgp.cc:278
virtual void get_subface_interpolation_matrix(const FiniteElement< dim, spacedim > &source, const unsigned int subface, FullMatrix< double > &matrix, const unsigned int face_no=0) const override
Definition: fe_dgp.cc:133
virtual std::string get_name() const override
Definition: fe_dgp.cc:60
static std::vector< unsigned int > get_dpo_vector(const unsigned int degree)
Definition: fe_dgp.cc:91
virtual std::vector< std::pair< unsigned int, unsigned int > > hp_vertex_dof_identities(const FiniteElement< dim, spacedim > &fe_other) const override
Definition: fe_dgp.cc:169
virtual void get_face_interpolation_matrix(const FiniteElement< dim, spacedim > &source, FullMatrix< double > &matrix, const unsigned int face_no=0) const override
Definition: fe_dgp.cc:107
FE_DGP(const unsigned int p)
Definition: fe_dgp.cc:28
virtual std::size_t memory_consumption() const override
Definition: fe_dgp.cc:290
virtual std::vector< std::pair< unsigned int, unsigned int > > hp_quad_dof_identities(const FiniteElement< dim, spacedim > &fe_other, const unsigned int face_no=0) const override
Definition: fe_dgp.cc:203
virtual std::unique_ptr< FiniteElement< dim, spacedim > > clone() const override
Definition: fe_dgp.cc:77
virtual FiniteElementDomination::Domination compare_for_domination(const FiniteElement< dim, spacedim > &fe_other, const unsigned int codim=0) const override final
Definition: fe_dgp.cc:221
virtual bool hp_constraints_are_implemented() const override
Definition: fe_dgp.cc:160
virtual std::string get_name() const =0
std::vector< std::vector< FullMatrix< double > > > restriction
Definition: fe.h:2413
void reinit_restriction_and_prolongation_matrices(const bool isotropic_restriction_only=false, const bool isotropic_prolongation_only=false)
std::vector< std::vector< FullMatrix< double > > > prolongation
Definition: fe.h:2427
size_type n() const
size_type m() const
#define DEAL_II_NAMESPACE_OPEN
Definition: config.h:442
#define DEAL_II_NAMESPACE_CLOSE
Definition: config.h:443
static ::ExceptionBase & ExcNotImplemented()
#define Assert(cond, exc)
Definition: exceptions.h:1473
static ::ExceptionBase & ExcImpossibleInDim(int arg1)
static ::ExceptionBase & ExcDimensionMismatch(std::size_t arg1, std::size_t arg2)
#define AssertThrow(cond, exc)
Definition: exceptions.h:1583
void compute_embedding_matrices(const FiniteElement< dim, spacedim > &fe, std::vector< std::vector< FullMatrix< number > > > &matrices, const bool isotropic_only=false, const double threshold=1.e-12)
void compute_projection_matrices(const FiniteElement< dim, spacedim > &fe, std::vector< std::vector< FullMatrix< number > > > &matrices, const bool isotropic_only=false)
std::vector< unsigned int > get_dpo_vector(const unsigned int degree)
static const char U
void L2(Vector< number > &result, const FEValuesBase< dim > &fe, const std::vector< double > &input, const double factor=1.)
Definition: l2.h:160
std::string dim_string(const int dim, const int spacedim)
Definition: utilities.cc:558
STL namespace.