/usr/share/doc/python-ffc/demo/Stokes.ufl is in python-ffc 1.4.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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) 2005-2007 Anders Logg
#
# 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/>.
#
# The bilinear form a(u, v) and Linear form L(v) for the Stokes
# equations using a mixed formulation (Taylor-Hood elements).
# Compile this form with FFC: ffc Stokes.ufl
P2 = VectorElement("Lagrange", triangle, 2)
P1 = FiniteElement("Lagrange", triangle, 1)
TH = P2 * P1
(u, p) = TrialFunctions(TH)
(v, q) = TestFunctions(TH)
f = Coefficient(P2)
a = (inner(grad(u), grad(v)) - div(v)*p + div(u)*q)*dx
L = inner(f, v)*dx
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