1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
|
# Copyright (C) 2009 Peter Brune
#
# This file is part of FFC.
#
# FFC is free software: you can redistribute it and/or modify
# it under the terms of the GNU Lesser General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# FFC is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with FFC. If not, see <http://www.gnu.org/licenses/>.
#
# This example demonstrates how to use the facet normals
# Merely project the normal onto a vector section
#
# Compile this form with FFC: ffc Normals.ufl
cell = triangle
element = VectorElement("Lagrange", cell, 1)
n = FacetNormal(cell)
v = TrialFunction(element)
u = TestFunction(element)
a = dot(v, u)*ds
L = dot(n, u)*ds
|
