Created
June 27, 2018 14:16
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Preliminary tests of mesh tagging with pygmsh-meshio-dolfin pipeline
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from pygmsh.built_in.geometry import Geometry | |
from pygmsh import generate_mesh | |
import meshio | |
from dolfin import Mesh, MeshFunction, XDMFFile | |
geom = Geometry() | |
lc = .1 | |
p0 = geom.add_point([0, 0, 0], lcar=lc) | |
p1 = geom.add_point([1, 0, 0], lcar=lc) | |
p2 = geom.add_point([1, 1, 0], lcar=lc) | |
p3 = geom.add_point([0, 1, 0], lcar=lc) | |
l0 = geom.add_line(p0, p1) | |
l1 = geom.add_line(p1, p2) | |
l2 = geom.add_line(p2, p3) | |
l3 = geom.add_line(p3, p0) | |
ll = geom.add_line_loop(lines=[l0, l1, l2, l3]) | |
ps = geom.add_plane_surface(ll) | |
# Tag line and surface | |
geom.add_physical_line(lines=l3, label=444) | |
geom.add_physical_surface(surfaces=ps, label=456) | |
points, cells, point_data, cell_data, field_data = generate_mesh(geom) | |
meshio.write("mesh_2d.xdmf", meshio.Mesh( | |
points=points, | |
cells={"triangle": cells["triangle"]})) | |
meshio.write("mf_1d.xdmf", meshio.Mesh( | |
points=points, | |
cells={"line": cells["line"]}, | |
cell_data={"line": cell_data["line"]} | |
)) | |
mesh_2d = Mesh() | |
with XDMFFile("mesh_2d.xdmf") as infile: | |
infile.read(mesh_2d) | |
mf = MeshFunction("size_t", mesh_2d, 1) | |
with XDMFFile("mf_1d.xdmf") as infile: | |
infile.read(mf, "gmsh:physical") |
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