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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) 2010 Marie E. Rognes
#
# 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/>.
#
# Illustration of vector sum of elements (EnrichedElement): The
# bilinear form a(u, v) for the Stokes equations using a mixed
# formulation involving the Mini element. The velocity element is
# composed of a P1 element augmented by the cubic bubble function.
# Compile this form with FFC: ffc Mini.ufl
P1 = VectorElement("Lagrange", triangle, 1)
B = VectorElement("Bubble", triangle, 3)
Q = FiniteElement("CG", triangle, 1)
Mini = (P1 + B)*Q
(u, p) = TrialFunctions(Mini)
(v, q) = TestFunctions(Mini)
a = (inner(grad(u), grad(v)) - div(v)*p + div(u)*q)*dx
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