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"""This demo program demonstrates how to mark sub domains of a mesh
and store the sub domain markers as a mesh function to a DOLFIN XML
file.
The sub domain markers produced by this demo program are the ones used
for the Stokes demo programs.
"""
# Copyright (C) 2007 Kristian B. Oelgaard
#
# This file is part of DOLFIN.
#
# DOLFIN 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.
#
# DOLFIN 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 DOLFIN. If not, see <http://www.gnu.org/licenses/>.
#
# Modified by Anders Logg, 2008.
#
# First added: 2007-11-15
# Last changed: 2011-01-25
# Begin demo
from dolfin import *
set_log_level(1)
# Sub domain for no-slip (mark whole boundary, inflow and outflow will overwrite)
class Noslip(SubDomain):
def inside(self, x, on_boundary):
return on_boundary
# Sub domain for inflow (right)
class Inflow(SubDomain):
def inside(self, x, on_boundary):
return x[0] > 1.0 - DOLFIN_EPS and on_boundary
# Sub domain for outflow (left)
class Outflow(SubDomain):
def inside(self, x, on_boundary):
return x[0] < DOLFIN_EPS and on_boundary
# Read mesh
mesh = Mesh("../dolfin_fine.xml.gz")
# Create mesh functions over the cell facets
sub_domains = MeshFunction("size_t", mesh, mesh.topology().dim() - 1)
sub_domains_bool = MeshFunction("bool", mesh, mesh.topology().dim() - 1)
sub_domains_double = MeshFunction("double", mesh, mesh.topology().dim() - 1)
# Mark all facets as sub domain 3
sub_domains.set_all(3)
sub_domains_bool.set_all(False)
sub_domains_double.set_all(0.3)
# Mark no-slip facets as sub domain 0, 0.0
noslip = Noslip()
noslip.mark(sub_domains, 0)
noslip.mark(sub_domains_double, 0.0)
# Mark inflow as sub domain 1, 01
inflow = Inflow()
inflow.mark(sub_domains, 1)
inflow.mark(sub_domains_double, 0.1)
# Mark outflow as sub domain 2, 0.2, True
outflow = Outflow()
outflow.mark(sub_domains, 2)
outflow.mark(sub_domains_double, 0.2)
outflow.mark(sub_domains_bool, True)
# Save sub domains to file
file = File("subdomains.xml")
file << sub_domains
# FIXME: Not implemented
#file_bool = File("subdomains_bool.xml")
#file_bool << sub_domains_bool
file_double = File("subdomains_double.xml")
file_double << sub_domains_double
# Save sub domains to VTK files
file = File("subdomains.pvd")
file << sub_domains
file = File("subdomains_double.pvd")
file << sub_domains_double
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