def convert_and_create_facet_mesh_function(ifilename, ofilename):
# First convert the gmsh mesh
meshconvert.convert2xml(ifilename, ofilename)
# Now load the created mesh and initialise the required connectivity information
mesh = Mesh(ofilename)
mesh.order()
File(ofilename) << mesh
D = mesh.topology().dim()
mesh.init(D - 1, 0)
# read the data from the gmsh file once again
dim_count, vertices_used, tags = process_gmsh_elements(ifilename, D - 1)
# Get the facet-node connectivity information (reshape as a row of node indices per facet)
facets_as_nodes = mesh.topology()(D - 1, 0)().reshape(mesh.num_facets(), D)
# Create and initialise the mesh function
facet_mark_function = MeshFunction('uint', mesh, D - 1)
facet_mark_function.set_all(0)
# set the relevant values of the mesh function
facets_to_check = range(mesh.num_facets())
for i in range(len(tags)):
nodes = np.sort(np.array(vertices_used[2 * i:(2 * i + D)]))
value = tags[i][0]
if value != 0:
found = False
for j in range(len(facets_to_check)):
index = facets_to_check[j]
if np.array_equal(facets_as_nodes[index, :], nodes):
found = True
facets_to_check.pop(j)
# set the value of the mesh function
facet_mark_function[index] = value
break
if not found:
raise Exception("The facet (%d) was not found to mark: %s" %
(i, nodes))
# save the mesh function to file
fname = os.path.splitext(ofilename)[0]
mesh_function_file = File("%s_%s.xml" % (fname, "facet_regions"))
mesh_function_file << facet_mark_function
def convert_and_create_facet_mesh_function ( ifilename, ofilename ):
# First convert the gmsh mesh
meshconvert.convert2xml ( ifilename, ofilename )
# Now load the created mesh and initialise the required connectivity information
mesh = Mesh ( ofilename )
mesh.order()
File ( ofilename ) << mesh
D = mesh.topology().dim()
mesh.init(D-1, 0)
# read the data from the gmsh file once again
dim_count, vertices_used, tags = process_gmsh_elements( ifilename, D-1 )
# Get the facet-node connectivity information (reshape as a row of node indices per facet)
facets_as_nodes = mesh.topology()(D-1,0)().reshape ( mesh.num_facets(), D )
# Create and initialise the mesh function
facet_mark_function = MeshFunction ( 'uint', mesh, D-1 )
facet_mark_function.set_all( 0 )
# set the relevant values of the mesh function
facets_to_check = range( mesh.num_facets() )
for i in range(len(tags)):
nodes = np.sort(np.array(vertices_used[2*i:(2*i+D)]))
value = tags[i][0]
if value != 0:
found = False
for j in range(len(facets_to_check)):
index = facets_to_check[j]
if np.array_equal(facets_as_nodes[index,:], nodes):
found = True;
facets_to_check.pop(j)
# set the value of the mesh function
facet_mark_function[index] = value
break;
if not found:
raise Exception ( "The facet (%d) was not found to mark: %s" % (i, nodes) )
# save the mesh function to file
fname = os.path.splitext(ofilename)[0]
mesh_function_file = File("%s_%s.xml" % (fname, "facet_regions"))
mesh_function_file << facet_mark_function
def import_from_gmsh(fname):
"Convert from gmsh to dolfin"
# read with meshio
msh = meshio.read(fname)
# create a DOLFIN mesh (assuming 2d)
gdim, tdim = 2, 2
mm = Mesh()
editor = MeshEditor()
editor.open(mm, "triangle", gdim, tdim)
npt = msh.points.shape[0]
nc = msh.get_cells_type("triangle").shape[0]
editor.init_vertices_global(npt, npt)
editor.init_cells_global(nc, nc)
for i, p in enumerate(msh.points):
editor.add_vertex(i, p[:2])
for i, c in enumerate(msh.get_cells_type("triangle")):
editor.add_cell(i, c)
editor.close()
# domains
md = mm.domains()
md.init(tdim)
markers = {}
if 'gmsh:physical' not in msh.cell_data_dict:
# no markers at all
return mm, markers
phy = msh.cell_data_dict['gmsh:physical']
if 'triangle' in phy:
for eid, val in enumerate(phy['triangle']):
md.set_marker((eid, val), 2)
if 'line' in phy:
mm.init(0, 1)
p2e = mm.topology()(0, 1)
for l, k in zip(msh.get_cells_type("line"), phy['line']):
e = set(p2e(l[0])).intersection(p2e(l[1])).pop()
md.set_marker((e, k), 1)
if 'vertex' in phy:
for eid, val in zip(msh.get_cells_type("vertex"), phy['vertex']):
md.set_marker((eid[0], val), 0)
# names
markers = tuple(
{n: v.item()
for n, (v, d) in msh.field_data.items() if d == dim}
for dim in range(tdim + 1))
return mm, markers
def load_h5_mesh(h5_file, scale_factor=None):
'''Unpack to mesh, volumes and surfaces'''
mesh = Mesh()
h5 = HDF5File(mesh.mpi_comm(), h5_file, 'r')
h5.read(mesh, 'mesh', False)
# Convert units
if scale_factor is not None:
assert scale_factor > 0, "Scale factor must be a positive real number!"
mesh.coordinates()[:] *= scale_factor
surfaces = MeshFunction('size_t', mesh, mesh.topology().dim() - 1)
h5.read(surfaces, 'surfaces')
volumes = MeshFunction('size_t', mesh, mesh.topology().dim())
h5.read(volumes, 'volumes')
return mesh, volumes, surfaces
def DolfinReader(directory, file):
msh = Mesh()
with XDMFFile("{}/{}.xdmf".format(directory, file)) as infile:
infile.read(msh)
dim = msh.topology().dim()
mvc = MeshValueCollection("size_t", msh, dim=dim - 1)
with XDMFFile("{}/{}_facets.xdmf".format(directory, file)) as infile:
infile.read(mvc, "boundaries")
boundaries = MeshFunctionSizet(msh, mvc)
mvc = MeshValueCollection("size_t", msh, dim=dim)
with XDMFFile("{}/{}_physical_region.xdmf".format(directory,
file)) as infile:
infile.read(mvc, "subdomains")
subdomains = MeshFunctionSizet(msh, mvc)
return msh, boundaries, subdomains
bc = DirichletBC(V, Constant((0, 0, 0)), clamped_boundary)
# Define strain and stress
def epsilon(u):
return 0.5 * (grad(u) + grad(u).T)
def sigma(u):
return lambda_ * div(u) * Identity(d) + 2 * mu * epsilon(u)
# Mark facets of the mesh and Neumann boundary condition
boundaries = MeshFunction("size_t", mesh, mesh.topology().dim() - 1)
boundaries.set_all(0)
class NeumanBoundary(SubDomain):
def inside(self, x, on_boundary):
return on_boundary and near(x[0], 6, tol)
NeumanBoundary().mark(boundaries, 1)
# Define outer surface measure aware of Dirichlet and Neumann boundaries
ds = Measure('ds', domain=mesh, subdomain_data=boundaries)
# Define variational problem
u = TrialFunction(V)
def gmsh2xml(ifilename, handler):
"""Convert between .gmsh v2.0 format (http://www.geuz.org/gmsh/) and .xml,
parser implemented as a state machine:
0 = read 'MeshFormat'
1 = read mesh format data
2 = read 'EndMeshFormat'
3 = read 'Nodes'
4 = read number of vertices
5 = read vertices
6 = read 'EndNodes'
7 = read 'Elements'
8 = read number of cells
9 = read cells
10 = done
Afterwards, extract physical region numbers if they are defined in
the mesh file as a mesh function.
"""
print("Converting from Gmsh format (.msh, .gmsh) to DOLFIN XML format")
# The dimension of the gmsh element types supported here as well as the dolfin cell types for each dimension
gmsh_dim = {15: 0, 1: 1, 2: 2, 4: 3}
cell_type_for_dim = {1: "interval", 2: "triangle", 3: "tetrahedron" }
# the gmsh element types supported for conversion
supported_gmsh_element_types = [1, 2, 4, 15]
# Open files
ifile = open(ifilename, "r")
# Scan file for cell type
cell_type = None
highest_dim = 0
line = ifile.readline()
while line:
# Remove newline
line = line.rstrip("\n\r")
# Read dimension
if line.find("$Elements") == 0:
line = ifile.readline()
num_elements = int(line)
if num_elements == 0:
_error("No elements found in gmsh file.")
line = ifile.readline()
# Now iterate through elements to find largest dimension. Gmsh
# format might include elements of lower dimensions in the element list.
# We also need to count number of elements of correct dimensions.
# Also determine which vertices are not used.
dim_count = {0: 0, 1: 0, 2: 0, 3: 0}
vertices_used_for_dim = {0: [], 1: [], 2: [], 3: []}
# Array used to store gmsh tags for 1D (type 1/line), 2D (type 2/triangular) elements and 3D (type 4/tet) elements
tags_for_dim = {0: [], 1: [], 2: [], 3: []}
while line.find("$EndElements") == -1:
element = line.split()
elem_type = int(element[1])
num_tags = int(element[2])
if elem_type in supported_gmsh_element_types:
dim = gmsh_dim[elem_type]
if highest_dim < dim:
highest_dim = dim
node_num_list = [int(node) for node in element[3 + num_tags:]]
vertices_used_for_dim[dim].extend(node_num_list)
if num_tags > 0:
tags_for_dim[dim].append(tuple(int(tag) for tag in element[3:3+num_tags]))
dim_count[dim] += 1
else:
#TODO: output a warning here. "gmsh element type %d not supported" % elem_type
pass
line = ifile.readline()
else:
# Read next line
line = ifile.readline()
# Check that we got the cell type and set num_cells_counted
if highest_dim == 0:
_error("Unable to find cells of supported type.")
num_cells_counted = dim_count[highest_dim]
vertex_set = set(vertices_used_for_dim[highest_dim])
vertices_used_for_dim[highest_dim] = None
vertex_dict = {}
for n,v in enumerate(vertex_set):
vertex_dict[v] = n
# Step to beginning of file
ifile.seek(0)
# Set mesh type
handler.set_mesh_type(cell_type_for_dim[highest_dim], highest_dim)
# Initialise node list (gmsh does not export all vertexes in order)
nodelist = {}
# Current state
state = 0
# Write data
num_vertices_read = 0
num_cells_read = 0
# Only import the dolfin objects if facet markings exist
process_facets = False
if len(tags_for_dim[highest_dim-1]) > 0:
# first construct the mesh
try:
from dolfin import MeshEditor, Mesh
except ImportError:
_error("DOLFIN must be installed to handle Gmsh boundary regions")
mesh = Mesh()
mesh_editor = MeshEditor ()
mesh_editor.open( mesh, highest_dim, highest_dim )
process_facets = True
else:
# TODO: Output a warning or an error here
me = None
while state != 10:
# Read next line
line = ifile.readline()
if not line: break
# Skip comments
if line[0] == '#':
continue
# Remove newline
line = line.rstrip("\n\r")
if state == 0:
if line == "$MeshFormat":
state = 1
elif state == 1:
(version, file_type, data_size) = line.split()
state = 2
elif state == 2:
if line == "$EndMeshFormat":
state = 3
elif state == 3:
if line == "$Nodes":
state = 4
elif state == 4:
num_vertices = len(vertex_dict)
handler.start_vertices(num_vertices)
if process_facets:
mesh_editor.init_vertices_global(num_vertices, num_vertices)
state = 5
elif state == 5:
(node_no, x, y, z) = line.split()
node_no = int(node_no)
x,y,z = [float(xx) for xx in (x,y,z)]
if node_no in vertex_dict:
node_no = vertex_dict[node_no]
else:
continue
nodelist[int(node_no)] = num_vertices_read
handler.add_vertex(num_vertices_read, [x, y, z])
if process_facets:
if highest_dim == 1:
coords = numpy.array([x])
elif highest_dim == 2:
coords = numpy.array([x, y])
elif highest_dim == 3:
coords = numpy.array([x, y, z])
mesh_editor.add_vertex(num_vertices_read, coords)
num_vertices_read +=1
if num_vertices == num_vertices_read:
handler.end_vertices()
state = 6
elif state == 6:
if line == "$EndNodes":
state = 7
elif state == 7:
if line == "$Elements":
state = 8
elif state == 8:
handler.start_cells(num_cells_counted)
if process_facets:
mesh_editor.init_cells_global(num_cells_counted, num_cells_counted)
state = 9
elif state == 9:
element = line.split()
elem_type = int(element[1])
num_tags = int(element[2])
if elem_type in supported_gmsh_element_types:
dim = gmsh_dim[elem_type]
else:
dim = 0
if dim == highest_dim:
node_num_list = [vertex_dict[int(node)] for node in element[3 + num_tags:]]
for node in node_num_list:
if not node in nodelist:
_error("Vertex %d of %s %d not previously defined." %
(node, cell_type_for_dim[dim], num_cells_read))
cell_nodes = [nodelist[n] for n in node_num_list]
handler.add_cell(num_cells_read, cell_nodes)
if process_facets:
cell_nodes = numpy.array([nodelist[n] for n in node_num_list], dtype=numpy.uintp)
mesh_editor.add_cell(num_cells_read, cell_nodes)
num_cells_read +=1
if num_cells_counted == num_cells_read:
handler.end_cells()
if process_facets:
mesh_editor.close()
state = 10
elif state == 10:
break
# Write mesh function based on the Physical Regions defined by
# gmsh, but only if they are not all zero. All zero physical
# regions indicate that no physical regions were defined.
if highest_dim not in [1,2,3]:
_error("Gmsh tags not supported for dimension %i. Probably a bug" % dim)
tags = tags_for_dim[highest_dim]
physical_regions = tuple(tag[0] for tag in tags)
if not all(tag == 0 for tag in physical_regions):
handler.start_meshfunction("physical_region", dim, num_cells_counted)
for i, physical_region in enumerate(physical_regions):
handler.add_entity_meshfunction(i, physical_region)
handler.end_meshfunction()
# Now process the facet markers
tags = tags_for_dim[highest_dim-1]
if (len(tags) > 0) and (mesh is not None):
physical_regions = tuple(tag[0] for tag in tags)
if not all(tag == 0 for tag in physical_regions):
mesh.init(highest_dim-1,0)
# Get the facet-node connectivity information (reshape as a row of node indices per facet)
if highest_dim==1:
# for 1d meshes the mesh topology returns the vertex to vertex map, which isn't what we want
# as facets are vertices
facets_as_nodes = numpy.array([[i] for i in range(mesh.num_facets())])
else:
facets_as_nodes = mesh.topology()(highest_dim-1,0)().reshape ( mesh.num_facets(), highest_dim )
# Build the reverse map
nodes_as_facets = {}
for facet in range(mesh.num_facets()):
nodes_as_facets[tuple(facets_as_nodes[facet,:])] = facet
data = [int(0*k) for k in range(mesh.num_facets()) ]
for i, physical_region in enumerate(physical_regions):
nodes = [n-1 for n in vertices_used_for_dim[highest_dim-1][highest_dim*i:(highest_dim*i+highest_dim)]]
nodes.sort()
if physical_region != 0:
try:
index = nodes_as_facets[tuple(nodes)]
data[index] = physical_region
except IndexError:
raise Exception ( "The facet (%d) was not found to mark: %s" % (i, nodes) )
# Create and initialise the mesh function
handler.start_meshfunction("facet_region", highest_dim-1, mesh.num_facets() )
for index, physical_region in enumerate ( data ):
handler.add_entity_meshfunction(index, physical_region)
handler.end_meshfunction()
# Check that we got all data
if state == 10:
print("Conversion done")
else:
_error("Missing data, unable to convert \n\ Did you use version 2.0 of the gmsh file format?")
# Close files
ifile.close()
def create_submesh(mesh, markers, marker):
"This function allows for a SubMesh-equivalent to be created in parallel"
# Build mesh
submesh = Mesh()
mesh_editor = MeshEditor()
mesh_editor.open(submesh,
mesh.ufl_cell().cellname(),
mesh.ufl_cell().topological_dimension(),
mesh.ufl_cell().geometric_dimension())
# Return empty mesh if no matching markers
if MPI.sum(mpi_comm_world(), int(marker in markers.array())) == 0:
cbc_warning(
"Unable to find matching markers in meshfunction. Submesh is empty."
)
mesh_editor.close()
return submesh
base_cell_indices = np.where(markers.array() == marker)[0]
base_cells = mesh.cells()[base_cell_indices]
base_vertex_indices = np.unique(base_cells.flatten())
base_global_vertex_indices = sorted(
[mesh.topology().global_indices(0)[vi] for vi in base_vertex_indices])
gi = mesh.topology().global_indices(0)
shared_local_indices = set(base_vertex_indices).intersection(
set(mesh.topology().shared_entities(0).keys()))
shared_global_indices = [gi[vi] for vi in shared_local_indices]
unshared_global_indices = list(
set(base_global_vertex_indices) - set(shared_global_indices))
unshared_vertices_dist = distribution(len(unshared_global_indices))
# Number unshared vertices on separate process
idx = sum(unshared_vertices_dist[:MPI.rank(mpi_comm_world())])
base_to_sub_global_indices = {}
for gi in unshared_global_indices:
base_to_sub_global_indices[gi] = idx
idx += 1
# Gather all shared process on process 0 and assign global index
all_shared_global_indices = gather(shared_global_indices,
on_process=0,
flatten=True)
all_shared_global_indices = np.unique(all_shared_global_indices)
shared_base_to_sub_global_indices = {}
idx = int(
MPI.max(mpi_comm_world(),
float(max(base_to_sub_global_indices.values() + [-1e16]))) + 1)
if MPI.rank(mpi_comm_world()) == 0:
for gi in all_shared_global_indices:
shared_base_to_sub_global_indices[int(gi)] = idx
idx += 1
# Broadcast global numbering of all shared vertices
shared_base_to_sub_global_indices = dict(
zip(broadcast(shared_base_to_sub_global_indices.keys(), 0),
broadcast(shared_base_to_sub_global_indices.values(), 0)))
# Join shared and unshared numbering in one dict
base_to_sub_global_indices = dict(
base_to_sub_global_indices.items() +
shared_base_to_sub_global_indices.items())
# Create mapping of local indices
base_to_sub_local_indices = dict(
zip(base_vertex_indices, range(len(base_vertex_indices))))
# Define sub-cells
sub_cells = [None] * len(base_cells)
for i, c in enumerate(base_cells):
sub_cells[i] = [base_to_sub_local_indices[j] for j in c]
# Store vertices as sub_vertices[local_index] = (global_index, coordinates)
sub_vertices = {}
for base_local, sub_local in base_to_sub_local_indices.items():
sub_vertices[sub_local] = (base_to_sub_global_indices[
mesh.topology().global_indices(0)[base_local]],
mesh.coordinates()[base_local])
## Done with base mesh
# Distribute meshdata on (if any) empty processes
sub_cells, sub_vertices = distribute_meshdata(sub_cells, sub_vertices)
global_cell_distribution = distribution(len(sub_cells))
#global_vertex_distribution = distribution(len(sub_vertices))
global_num_cells = MPI.sum(mpi_comm_world(), len(sub_cells))
global_num_vertices = sum(unshared_vertices_dist) + MPI.sum(
mpi_comm_world(), len(all_shared_global_indices))
mesh_editor.init_vertices(len(sub_vertices))
#mesh_editor.init_cells(len(sub_cells))
mesh_editor.init_cells_global(len(sub_cells), global_num_cells)
global_index_start = sum(
global_cell_distribution[:MPI.rank(mesh.mpi_comm())])
for index, cell in enumerate(sub_cells):
if LooseVersion(dolfin_version()) >= LooseVersion("1.6.0"):
mesh_editor.add_cell(index, *cell)
else:
mesh_editor.add_cell(int(index), global_index_start + index,
np.array(cell, dtype=np.uintp))
for local_index, (global_index, coordinates) in sub_vertices.items():
#print coordinates
mesh_editor.add_vertex_global(int(local_index), int(global_index),
coordinates)
mesh_editor.close()
submesh.topology().init(0, len(sub_vertices), global_num_vertices)
submesh.topology().init(mesh.ufl_cell().topological_dimension(),
len(sub_cells), global_num_cells)
# FIXME: Set up shared entities
# What damage does this do?
submesh.topology().shared_entities(0)[0] = []
# The code below sets up shared vertices, but lacks shared facets.
# It is considered incomplete, and therefore commented out
'''
#submesh.topology().shared_entities(0)[0] = []
from dolfin import compile_extension_module
cpp_code = """
void set_shared_entities(Mesh& mesh, std::size_t idx, const Array<std::size_t>& other_processes)
{
std::set<unsigned int> set_other_processes;
for (std::size_t i=0; i<other_processes.size(); i++)
{
set_other_processes.insert(other_processes[i]);
//std::cout << idx << " --> " << other_processes[i] << std::endl;
}
//std::cout << idx << " --> " << set_other_processes[0] << std::endl;
mesh.topology().shared_entities(0)[idx] = set_other_processes;
}
"""
set_shared_entities = compile_extension_module(cpp_code).set_shared_entities
base_se = mesh.topology().shared_entities(0)
se = submesh.topology().shared_entities(0)
for li in shared_local_indices:
arr = np.array(base_se[li], dtype=np.uintp)
sub_li = base_to_sub_local_indices[li]
set_shared_entities(submesh, base_to_sub_local_indices[li], arr)
'''
return submesh
if discretization == "DG":
Q_element = FiniteElement("DG", mesh.ufl_cell(), 1)
W_element = BlockElement(V_element, Q_element)
elif discretization == "EG":
Q_element = FiniteElement("CG", mesh.ufl_cell(), 1)
D_element = FiniteElement("DG", mesh.ufl_cell(), 0)
EG_element = Q_element + D_element
W_element = BlockElement(V_element, EG_element)
else:
raise RuntimeError("Invalid discretization")
W = BlockFunctionSpace(mesh, W_element)
PM = FunctionSpace(mesh, "DG", 0)
TM = TensorFunctionSpace(mesh, "DG", 0)
I = Identity(mesh.topology().dim())
dx = Measure("dx", domain=mesh, subdomain_data=subdomains)
ds = Measure("ds", domain=mesh, subdomain_data=boundaries)
dS = Measure("dS", domain=mesh, subdomain_data=boundaries)
# Test and trial functions
vq = BlockTestFunction(W)
(v, q) = block_split(vq)
up = BlockTrialFunction(W)
(u, p) = block_split(up)
w = BlockFunction(W)
w0 = BlockFunction(W)
(u0, p0) = block_split(w0)
def test_convert_triangle(
self): # Disabled because it fails, see FIXME below
# test no. 1
from dolfin import Mesh, MPI
fname = os.path.join(os.path.dirname(__file__), "data", "triangle")
dfname = fname + ".xml"
# Read triangle file and convert to a dolfin xml mesh file
meshconvert.triangle2xml(fname, dfname)
# Read in dolfin mesh and check number of cells and vertices
mesh = Mesh(dfname)
self.assertEqual(mesh.num_vertices(), 96)
self.assertEqual(mesh.num_cells(), 159)
# Clean up
os.unlink(dfname)
# test no. 2
from dolfin import MPI, Mesh, MeshFunction, \
edges, Edge, faces, Face, \
SubsetIterator, facets
fname = os.path.join(os.path.dirname(__file__), "data",
"test_Triangle_3")
dfname = fname + ".xml"
dfname0 = fname + ".attr0.xml"
# Read triangle file and convert to a dolfin xml mesh file
meshconvert.triangle2xml(fname, dfname)
# Read in dolfin mesh and check number of cells and vertices
mesh = Mesh(dfname)
mesh.init()
mfun = MeshFunction('double', mesh, dfname0)
self.assertEqual(mesh.num_vertices(), 58)
self.assertEqual(mesh.num_cells(), 58)
# Create a size_t MeshFunction and assign the values based on the
# converted Meshfunction
cf = MeshFunction("size_t", mesh, mesh.topology().dim())
cf.array()[mfun.array() == 10.0] = 0
cf.array()[mfun.array() == -10.0] = 1
# Meassure total area of cells with 1 and 2 marker
add = lambda x, y: x + y
area0 = reduce(add, (Face(mesh, cell.index()).area() \
for cell in SubsetIterator(cf, 0)), 0.0)
area1 = reduce(add, (Face(mesh, cell.index()).area() \
for cell in SubsetIterator(cf, 1)), 0.0)
total_area = reduce(add, (face.area() for face in faces(mesh)), 0.0)
# Check that all cells in the two domains are either above or below y=0
self.assertTrue(
all(cell.midpoint().y() < 0 for cell in SubsetIterator(cf, 0)))
self.assertTrue(
all(cell.midpoint().y() > 0 for cell in SubsetIterator(cf, 1)))
# Check that the areas add up
self.assertAlmostEqual(area0 + area1, total_area)
# Measure the edge length of the two edge domains
#edge_markers = mesh.domains().facet_domains()
edge_markers = mesh.domains().markers(mesh.topology().dim() - 1)
self.assertTrue(edge_markers is not None)
#length0 = reduce(add, (Edge(mesh, e.index()).length() \
# for e in SubsetIterator(edge_markers, 0)), 0.0)
length0, length1 = 0.0, 0.0
for item in list(edge_markers.items()):
if item[1] == 0:
e = Edge(mesh, int(item[0]))
length0 += Edge(mesh, int(item[0])).length()
elif item[1] == 1:
length1 += Edge(mesh, int(item[0])).length()
# Total length of all edges and total length of boundary edges
total_length = reduce(add, (e.length() for e in edges(mesh)), 0.0)
boundary_length = reduce(add, (Edge(mesh, f.index()).length() \
for f in facets(mesh) if f.exterior()), 0.0)
# Check that the edges add up
self.assertAlmostEqual(length0 + length1, total_length)
self.assertAlmostEqual(length1, boundary_length)
# Clean up
os.unlink(dfname)
os.unlink(dfname0)
h5.read(tile, 'mesh', False)
# Shift and so
x = tile.coordinates()
xmin = x.min(axis=0)
dx = x.max(axis=0) - xmin
if args.shift_origin: x[:] -= xmin
x[:] *= args.scale_x
# Did it work?
print(dx, 'vs', x.max(axis=0) - x.min(axis=0), xmin, x.min(axis=0))
data = {}
cell_dim = tile.topology().dim()
facet_dim = cell_dim - 1
if args.facet_tags:
data = load_data(tile, (h5, args.facet_tags), facet_dim, data)
if args.cell_tags:
data = load_data(tile, (h5, args.cell_tags), cell_dim, data)
t = Timer('tile')
mesh, mesh_data = TileMesh(tile, shape, mesh_data=data)
info('\nTiling took %g s; nvertices %d, nfacets %d, ncells %d' %
(t.stop(), mesh.num_vertices(), mesh.init(2), mesh.num_cells()))
x_ = mesh.coordinates()
print('Final mesh size', x_.min(axis=0), x_.max(axis=0) - x_.min(axis=0))
def eafe_assemble(
mesh: Mesh,
diffusion: Coefficient,
convection: Optional[Coefficient] = None,
reaction: Optional[Coefficient] = None,
) -> dolfin.Matrix:
"""
Assembly of stiffness matrix for a generic linear elliptic equation:
for `u` a continuous piecewise-linear finite element function,
-div(diffusion * grad(u) + convection * u) + reaction * u = source
Edge-integral quantities are approximated by a midpoint quadrature rule.
:param mesh: Mesh defining finite element space
:param diff: Coefficient for diffusion coefficient
:param conv: [Optional] Coefficient for convection coefficient
:param reac: [Optional] Coefficient for reaction coefficient
:return: dolfin.Matrix pertaining to EAFE stiffness matrix
"""
if not issubclass(mesh.__class__, Mesh):
raise TypeError(
"Invalid mesh parameter: must inherit from dolfin.Mesh")
logging.getLogger("FFC").setLevel(logging.WARNING)
quadrature_degree = parameters["form_compiler"]["quadrature_degree"]
parameters["form_compiler"]["quadrature_degree"] = 2
spatial_dim: int = mesh.topology().dim()
cell_vertex_count: int = spatial_dim + 1
try:
edge_advection = define_edge_advection(spatial_dim, diffusion,
convection)
lumped_reaction = define_mass_lumping(cell_vertex_count, reaction)
except Exception as e:
parameters["form_compiler"]["quadrature_degree"] = quadrature_degree
raise e
V = FunctionSpace(mesh, "Lagrange", 1)
u = TrialFunction(V)
v = TestFunction(V)
a = inner(grad(u), grad(v)) * dx
A: dolfin.Matrix = assemble(a)
mat: dolfin.PETScMatrix = as_backend_type(A).mat()
A.zero()
dof_map = V.dofmap()
dof_coord = V.tabulate_dof_coordinates()
for cell in cells(mesh):
local_tensor = assemble_local(a, cell)
local_to_global_map = dof_map.cell_dofs(cell.index())
cell_vertex = np.empty([cell_vertex_count, spatial_dim])
for local_dof in range(0, cell_vertex_count):
dof_id = local_to_global_map[local_dof]
for coord in range(0, spatial_dim):
cell_vertex[local_dof, coord] = dof_coord[dof_id, coord]
for vertex_id in range(0, cell_vertex_count):
vertex = cell_vertex[vertex_id]
local_tensor[vertex_id, vertex_id] = lumped_reaction(vertex, cell)
for edge_id in range(0, cell_vertex_count):
if edge_id == vertex_id:
continue
edge = cell_vertex[edge_id] - vertex
local_tensor[vertex_id,
edge_id] *= edge_advection(vertex, edge, cell)
local_tensor[vertex_id, vertex_id] -= local_tensor[vertex_id,
edge_id]
local_to_global_list = local_to_global_map.tolist()
mat.setValuesLocal(
local_to_global_list,
local_to_global_list,
local_tensor,
PETSc.InsertMode.ADD,
)
A.apply("insert")
mat.assemble()
parameters["form_compiler"]["quadrature_degree"] = quadrature_degree
return A
def mesh_around_1d(mesh, size=1, scale=10, padding=0.05):
'''
From a 1d in xd (X > 1) mesh (in XML format) produce a Xd mesh where
the 1d structure is embedded. Mesh size close to strucure should
be size(given as multiple of hmin(), elsewhere scale * size. Padding
controls size of the bounding box.
'''
dot = mesh.find('.')
root, ext = mesh[:dot], mesh[dot:]
assert ext == '.xml' or ext == '.xml.gz', ext
mesh = Mesh(mesh)
gdim = mesh.geometry().dim()
assert gdim > 1 and mesh.topology().dim() == 1
x = mesh.coordinates()
mesh.init(1, 0)
# Compute fall back mesh size:
assert size > 0
size = mesh.hmin() * size
# Don't allow zero padding - collision of lines with bdry segfaults
# too ofter so we prevent it
assert padding > 0
# Finally scale better be positive
assert scale > 0
point = (lambda xi: tuple(xi) + (0, ))\
if gdim == 2 else (lambda xi: tuple(xi))
geo = '.'.join([root, 'geo'])
with open(geo, 'w') as outfile:
# Setup
outfile.write('SetFactory("OpenCASCADE");\n')
outfile.write('size = %g;\n' % size)
outfile.write('SIZE = %g;\n' % (size * scale))
# Points
fmt = 'Point(%d) = {%.16f, %.16f, %.16f, size};\n'
for i, xi in enumerate(x, 1):
outfile.write(fmt % ((i, ) + point(xi)))
# Lines
fmt = 'Line(%d) = {%d, %d};\n'
for i, cell in enumerate(cells(mesh), 1):
outfile.write(fmt % ((i, ) + tuple(cell.entities(0) + 1)))
# BBox
xmin, xmax = x.min(0), x.max(0)
padding = (xmax - xmin) * padding / 2.
xmin -= padding
xmax += padding
dx = xmax - xmin
if gdim == 2 or dx[-1] < 1E-14: # All points are on a plane
rect = 'Rectangle(1) = {%g, %g, %g, %g, %g};\n' % (
xmin[0], xmin[1], 0 if gdim == 2 else xmin[2], dx[0], dx[1])
outfile.write(rect)
bbox = 'Surface'
else:
box = 'Box(1) = {%g, %g, %g, %g, %g, %g};\n' % (
xmin[0], xmin[1], xmin[2], dx[0], dx[1], dx[2])
outfile.write(box)
bbox = 'Volume'
# Crack
for line in xrange(1, mesh.num_cells() + 1):
outfile.write('Line{%d} In %s{1};\n' % (line, bbox))
# Add Physical volume/surface
outfile.write('Physical %s(1) = {1};\n' % bbox)
# Add Physical surface/line
lines = ', '.join(
map(lambda v: '%d' % v, xrange(1,
mesh.num_cells() + 1)))
outfile.write('Physical Line(1) = {%s};\n' % lines)
return geo, gdim
def test(path, type='mf'):
'''Evolve the tile in (n, n) pattern checking volume/surface properties'''
comm = mpi_comm_world()
h5 = HDF5File(comm, path, 'r')
tile = Mesh()
h5.read(tile, 'mesh', False)
init_container = lambda type, dim: (
MeshFunction('size_t', tile, dim, 0)
if type == 'mf' else MeshValueCollection('size_t', tile, dim))
for n in (2, 4):
data = {}
checks = {}
for dim, name in zip((2, 3), ('surfaces', 'volumes')):
# Get the collection
collection = init_container(type, dim)
h5.read(collection, name)
if type == 'mvc': collection = as_meshf(collection)
# Data to evolve
tile.init(dim, 0)
e2v = tile.topology()(dim, 0)
# Only want to evolve tag 1 (interfaces) for the facets.
data[(dim, 1)] = np.array(
[e2v(e.index()) for e in SubsetIterator(collection, 1)],
dtype='uintp')
if dim == 2:
check = lambda m, f: assemble(
FacetArea(m) * ds(domain=m,
subdomain_data=f,
subdomain_id=1) + avg(FacetArea(m)) *
dS(domain=m, subdomain_data=f, subdomain_id=1))
else:
check = lambda m, f: assemble(
CellVolume(m) * dx(
domain=m, subdomain_data=f, subdomain_id=1))
checks[
dim] = lambda m, f, t=tile, c=collection, n=n, check=check: abs(
check(m, f) - n**2 * check(t, c)) / (n**2 * check(t, c))
t = Timer('x')
mesh, mesh_data = TileMesh(tile, (n, n), mesh_data=data)
info('\tTiling took %g s. Ncells %d, nvertices %d, \n' %
(t.stop(), mesh.num_vertices(), mesh.num_cells()))
foos = mf_from_data(mesh, mesh_data)
# Mesh Functions
from_mf = np.array([checks[dim](mesh, foos[dim]) for dim in (2, 3)])
mvcs = mvc_from_data(mesh, mesh_data)
foos = as_meshf(mvcs)
# Mesh ValueCollections
from_mvc = np.array([checks[dim](mesh, foos[dim]) for dim in (2, 3)])
assert np.linalg.norm(from_mf - from_mvc) < 1E-13
# I ignore shared facets so there is bound to be some error in facets
# Volume should match well
print from_mf
class CavityProblemSetup():
def __init__(self, parameters, mesh_name, facet_name):
"""
Create the required function spaces, functions and boundary conditions
for a channel flow problem
"""
self.mesh = Mesh()
with XDMFFile(mesh_name) as infile:
infile.read(self.mesh)
mvc = MeshValueCollection("size_t", self.mesh,
self.mesh.topology().dim() - 1)
with XDMFFile(facet_name) as infile:
infile.read(mvc, "name_to_read")
mf = self.mf = cpp.mesh.MeshFunctionSizet(self.mesh, mvc)
self.bc_dict = {"bottom": 1, "right": 2, "top": 3, "left": 4}
T_init = Constant(parameters["initial temperature [°C]"])
self.t_amb = Constant(parameters["ambient temperature [°C]"])
self.t_feeder = Constant(parameters["temperature feeder [°C]"])
self.k_top = Constant(parameters["thermal conductivity top [W/(m K)]"])
self.k_lft = Constant(
parameters["thermal conductivity left [W/(m K)]"])
self.k_btm = Constant(
parameters["thermal conductivity bottom [W/(m K)]"])
self.k_rgt = Constant(
parameters["thermal conductivity right [W/(m K)]"])
self.U_m = Constant(parameters["mean velocity lid [m/s]"])
g = parameters["gravity [m/s²]"]
self.g = Constant((0.0, -g))
self.dt = Constant(parameters["dt [s]"])
self.D = Constant(parameters["Diffusivity [-]"])
self.V = V = VectorFunctionSpace(self.mesh, 'P', 2)
self.Q = Q = FunctionSpace(self.mesh, 'P', 1)
self.T = T = FunctionSpace(self.mesh, 'P', 1)
self.ds_ = Measure("ds", domain=self.mesh, subdomain_data=mf)
self.vu, self.vp, self.vt = (TestFunction(V), TestFunction(Q),
TestFunction(T))
self.u_, self.p_, self.t_ = Function(V), Function(Q), Function(T)
self.mu, self.rho = Function(T), Function(T)
self.u_1, self.p_1, self.t_1, self.rho_1 = (Function(V), Function(Q),
Function(T), Function(T))
self.u, self.p, self.t = (TrialFunction(V), TrialFunction(Q),
TrialFunction(T))
# boundary conditions
self.no_slip = Constant((0., 0))
self.topflow = Expression(("-x[0] * (x[0] - 1.0) * 6.0 * m", "0.0"),
m=self.U_m,
degree=2)
bc0 = DirichletBC(V, self.topflow, mf, self.bc_dict["top"])
bc1 = DirichletBC(V, self.no_slip, mf, self.bc_dict["left"])
bc2 = DirichletBC(V, self.no_slip, mf, self.bc_dict["bottom"])
bc3 = DirichletBC(V, self.no_slip, mf, self.bc_dict["right"])
# bc4 = df.DirichletBC(Q, df.Constant(0), top)
# bc3 = df.DirichletBC(T, df.Constant(800), top)
self.bcu = [bc0, bc1, bc2, bc3]
self.bcp = [DirichletBC(Q, Constant(0), mf, self.bc_dict["top"])]
self.bcp = []
self.bct = []
# self.bct = [DirichletBC(T, Constant(self.t_feeder), mf,
# self.bc_dict["top"])]
self.robin_boundary_terms = (
self.k_btm * (self.t - self.t_amb) * self.vt * self.ds_(1) +
self.k_rgt * (self.t - self.t_amb) * self.vt * self.ds_(2)
# + self.k_top*(self.t - self.t_feeder)*self.vt*self.ds_(3)
+ self.k_lft * (self.t - self.t_amb) * self.vt * self.ds_(4))
print("k, T", self.k_btm.values(), self.t_feeder.values())
print("k, T", self.k_rgt.values(), self.t_amb.values())
# print("k, T", self.k_top.values(), self.t_amb.values())
print("k, T", self.k_lft.values(), self.t_amb.values())
# set initial values
# TODO: find a better solution
x, y = T.tabulate_dof_coordinates().T
self.u_1.vector().vec().array[:] = 1e-6
# self.u_k.vector().vec().array[:] = 1e-6
self.p_.vector().vec(
).array[:] = -self.rho.vector().vec().array * g * y
self.p_1.vector().vec(
).array[:] = -self.rho.vector().vec().array * g * y
self.t_1.vector().vec().array = T_init
self.t_.assign(self.t_1)
return
def stokes(self):
P2 = VectorElement("CG", self.mesh.ufl_cell(), 2)
P1 = FiniteElement("CG", self.mesh.ufl_cell(), 1)
TH = P2 * P1
VQ = FunctionSpace(self.mesh, TH)
mf = self.mf
self.no_slip = Constant((0., 0))
self.topflow = Expression(("-x[0] * (x[0] - 1.0) * 6.0 * m", "0.0"),
m=self.U_m,
degree=2)
bc0 = DirichletBC(VQ.sub(0), self.topflow, mf, self.bc_dict["top"])
bc1 = DirichletBC(VQ.sub(0), self.no_slip, mf, self.bc_dict["left"])
bc2 = DirichletBC(VQ.sub(0), self.no_slip, mf, self.bc_dict["bottom"])
bc3 = DirichletBC(VQ.sub(0), self.no_slip, mf, self.bc_dict["right"])
# bc4 = DirichletBC(VQ.sub(1), Constant(0), mf, self.bc_dict["top"])
bcs = [bc0, bc1, bc2, bc3]
vup = TestFunction(VQ)
up = TrialFunction(VQ)
# the solution will be in here:
up_ = Function(VQ)
u, p = split(up) # Trial
vu, vp = split(vup) # Test
u_, p_ = split(up_) # Function holding the solution
F = self.mu*inner(grad(vu), grad(u))*dx - inner(div(vu), p)*dx \
- inner(vp, div(u))*dx + dot(self.g*self.rho, vu)*dx
solve(lhs(F) == rhs(F), up_, bcs=bcs)
self.u_.assign(project(u_, self.V))
self.p_.assign(project(p_, self.Q))
return
def initial_condition_from_file(self, path_u, path_p):
f_in = XDMFFile(path_u)
f_in.read_checkpoint(self.u_, "f", 0)
f_in = XDMFFile(path_p)
f_in.read_checkpoint(self.p_, "f", 0)
return
def get_rho(self):
return self.rho.vector().vec().array
def set_rho(self, rho):
self.rho.vector().vec().array[:] = rho
def get_mu(self):
return self.mu.vector().vec().array
def set_mu(self, mu):
self.mu.vector().vec().array[:] = mu
def get_t(self):
return self.t_.vector().vec().array
def set_t(self, t):
self.t_.vector().vec().array[:] = t
def get_dt(self):
return self.dt.values()
def set_dt(self, dt):
self.dt.assign(dt)
def get_D(self):
return self.D.values()
def set_D(self, D):
self.D.assign(D)
def get_t_amb(self):
return self.t_amb.values()
def set_t_amb(self, t_amb):
self.t_amb.assign(t_amb)
def plot(self):
cmap = mpl.cm.inferno
cmap_r = mpl.cm.inferno_r
u, p, t, m, r = self.u_, self.p_, self.t_, self.mu, self.rho
mesh = self.mesh
w0 = u.compute_vertex_values(mesh)
w0.shape = (2, -1)
magnitude = np.linalg.norm(w0, axis=0)
x, y = np.split(mesh.coordinates(), 2, 1)
u, v = np.split(w0, 2, 0)
x, y, u, v = x.ravel(), y.ravel(), u.ravel(), v.ravel()
tri = mesh.cells()
pressure = p.compute_vertex_values(mesh)
temperature = t.compute_vertex_values(mesh)
viscosity = m.compute_vertex_values(mesh)
density = r.compute_vertex_values(mesh)
fig = plt.figure(figsize=(12, 8))
ax1 = plt.subplot(121)
ax2 = plt.subplot(243, sharex=ax1, sharey=ax1)
ax3 = plt.subplot(244, sharex=ax1, sharey=ax1)
ax4 = plt.subplot(247, sharex=ax1, sharey=ax1)
ax5 = plt.subplot(248, sharex=ax1, sharey=ax1)
ax1.plot(x, y, "k.", ms=.5)
not0 = magnitude > 1e-6
if np.sum(not0) > 0:
ax1.quiver(x[not0], y[not0], u[not0], v[not0], magnitude[not0])
c2 = ax2.tricontourf(x, y, tri, pressure, levels=40, cmap=cmap)
c3 = ax3.tricontourf(x, y, tri, temperature, levels=40, cmap=cmap)
c4 = ax4.tricontourf(
x,
y,
tri,
viscosity,
levels=40,
# vmin=self.mu(800, .1), vmax=self.mu(600, .1),
cmap=cmap_r)
c5 = ax5.tricontourf(
x,
y,
tri,
density,
levels=40,
# vmin=self.rho(800.), vmax=self.rho(600.),
cmap=cmap_r)
plt.colorbar(c2, ax=ax2)
plt.colorbar(c3, ax=ax3, ticks=[temperature.min(), temperature.max()])
plt.colorbar(c4, ax=ax4, ticks=[viscosity.min(), viscosity.max()])
plt.colorbar(c5, ax=ax5, ticks=[density.min(), density.max()])
ax1.set_aspect("equal")
ax2.set_aspect("equal")
ax3.set_aspect("equal")
ax4.set_aspect("equal")
ax5.set_aspect("equal")
ax1.set_title("velocity\n{:.4f} ... {:.5f} m/s".format(
magnitude.min(), magnitude.max()))
ax2.set_title("pressure")
ax3.set_title("temperature")
ax4.set_title("viscosity")
ax5.set_title("density")
ax1.set_xlim([-.1, 1.1])
ax1.set_ylim([-.1, 1.1])
# plt.tight_layout()
return fig, (ax1, ax2)
def gmsh_to_dolfin_mesh(ifilename, handler):
"""Convert between .gmsh v2.0 format (http://www.geuz.org/gmsh/) and .xml,
parser implemented as a state machine:
0 = read 'MeshFormat'
1 = read mesh format data
2 = read 'EndMeshFormat'
3 = read 'Nodes'
4 = read number of vertices
5 = read vertices
6 = read 'EndNodes'
7 = read 'Elements'
8 = read number of cells
9 = read cells
10 = done
Afterwards, extract physical region numbers if they are defined in
the mesh file as a mesh function.
"""
print "Converting from Gmsh format (.msh, .gmsh) to DOLFIN XML format"
# The dimension of the gmsh element types supported here as well as the dolfin cell types for each dimension
gmsh_dim = {1: 1, 2: 2, 4: 3}
gmsh_cell_type = {1: "interval", 2: "triangle", 3: "tetrahedron"}
# the gmsh element types supported for conversion
supported_gmsh_element_types = [1, 2, 4]
# Open files
ifile = open(ifilename, "r")
# Scan file for cell type
cell_type = None
highest_dim = 0
line = ifile.readline()
while line:
# Remove newline
if line[-1] == "\n":
line = line[:-1]
# Read dimension
if line.find("$Elements") == 0:
line = ifile.readline()
num_elements = int(line)
num_cells_counted = 0
if num_elements == 0:
_error("No elements found in gmsh file.")
line = ifile.readline()
# Now iterate through elements to find largest dimension. Gmsh
# format might include elements of lower dimensions in the element list.
# We also need to count number of elements of correct dimensions.
# Also determine which vertices are not used.
dim_count = {1: 0, 2: 0, 3: 0}
vertices_used = {1: [], 2: [], 3: []}
# Array used to store gmsh tags for 1D (type 1/line), 2D (type 2/triangular) elements and 3D (type 4/tet) elements
tags_for_dim = {1: [], 2: [], 3: []}
while line.find("$EndElements") == -1:
element = line.split()
elem_type = int(element[1])
num_tags = int(element[2])
if elem_type in supported_gmsh_element_types:
dim = gmsh_dim[elem_type]
if highest_dim < dim:
highest_dim = dim
node_num_list = [
int(node) for node in element[3 + num_tags:]
]
vertices_used[dim].extend(node_num_list)
if num_tags > 0:
tags_for_dim[dim].append(
tuple(int(tag) for tag in element[3:3 + num_tags]))
dim_count[dim] += 1
else:
#TODO: output a warning here. "gmsh element type %d not supported" % elem_type
pass
line = ifile.readline()
else:
# Read next line
line = ifile.readline()
# Check that we got the cell type and set num_cells_counted
if highest_dim == 0:
_error("Unable to find cells of supported type.")
num_cells_counted = dim_count[highest_dim]
vertex_set = set(vertices_used[highest_dim])
vertices_used[highest_dim] = None
vertex_dict = {}
for n, v in enumerate(vertex_set):
vertex_dict[v] = n
# Step to beginning of file
ifile.seek(0)
# Set mesh type
handler.set_mesh_type(gmsh_cell_type[highest_dim], highest_dim)
# Initialise node list (gmsh does not export all vertexes in order)
nodelist = {}
# Current state
state = 0
# Write data
num_vertices_read = 0
num_cells_read = 0
# Now handle the facet markings
if len(tags_for_dim[highest_dim - 1]) > 0:
# first construct the mesh
from dolfin import MeshEditor, Mesh
mesh = Mesh()
me = MeshEditor()
me.open(mesh, highest_dim, highest_dim)
else:
me = None
while state != 10:
# Read next line
line = ifile.readline()
if not line: break
# Skip comments
if line[0] == '#':
continue
# Remove newline
if line[-1] == "\n":
line = line[:-1]
if state == 0:
if line == "$MeshFormat":
state = 1
elif state == 1:
(version, file_type, data_size) = line.split()
state = 2
elif state == 2:
if line == "$EndMeshFormat":
state = 3
elif state == 3:
if line == "$Nodes":
state = 4
elif state == 4:
num_vertices = len(vertex_dict)
handler.start_vertices(num_vertices)
if me is not None:
me.init_vertices(num_vertices)
state = 5
elif state == 5:
(node_no, x, y, z) = line.split()
node_no = int(node_no)
x, y, z = [float(xx) for xx in (x, y, z)]
if vertex_dict.has_key(node_no):
node_no = vertex_dict[node_no]
else:
continue
nodelist[int(node_no)] = num_vertices_read
handler.add_vertex(num_vertices_read, [x, y, z])
if me is not None:
if highest_dim == 1:
me.add_vertex(num_vertices_read, x)
elif highest_dim == 2:
me.add_vertex(num_vertices_read, x, y)
elif highest_dim == 3:
me.add_vertex(num_vertices_read, x, y, z)
num_vertices_read += 1
if num_vertices == num_vertices_read:
handler.end_vertices()
state = 6
elif state == 6:
if line == "$EndNodes":
state = 7
elif state == 7:
if line == "$Elements":
state = 8
elif state == 8:
handler.start_cells(num_cells_counted)
if me is not None:
me.init_cells(num_cells_counted)
state = 9
elif state == 9:
element = line.split()
elem_type = int(element[1])
num_tags = int(element[2])
if elem_type in supported_gmsh_element_types:
dim = gmsh_dim[elem_type]
else:
dim = 0
if dim == highest_dim:
node_num_list = [
vertex_dict[int(node)] for node in element[3 + num_tags:]
]
for node in node_num_list:
if not node in nodelist:
_error("Vertex %d of %s %d not previously defined." %
(node, gmsh_cell_type[dim], num_cells_read))
cell_nodes = [nodelist[n] for n in node_num_list]
handler.add_cell(num_cells_read, cell_nodes)
if me is not None:
me.add_cell(num_cells_read, *cell_nodes)
num_cells_read += 1
if num_cells_counted == num_cells_read:
handler.end_cells()
if me is not None:
me.close()
state = 10
elif state == 10:
break
# Write mesh function based on the Physical Regions defined by
# gmsh, but only if they are not all zero. All zero physical
# regions indicate that no physical regions were defined.
if highest_dim not in [1, 2, 3]:
_error("Gmsh tags not supported for dimension %i. Probably a bug" %
dim)
tags = tags_for_dim[highest_dim]
physical_regions = tuple(tag[0] for tag in tags)
if not all(tag == 0 for tag in physical_regions):
handler.start_meshfunction("physical_region", dim, num_cells_counted)
for i, physical_region in enumerate(physical_regions):
handler.add_entity_meshfunction(i, physical_region)
handler.end_meshfunction()
# Now process the facet markers
tags = tags_for_dim[highest_dim - 1]
if len(tags) > 0:
print tags
print vertices_used[highest_dim - 1]
physical_regions = tuple(tag[0] for tag in tags)
if not all(tag == 0 for tag in physical_regions):
mesh.init(highest_dim - 1, 0)
# Get the facet-node connectivity information (reshape as a row of node indices per facet)
facets_as_nodes = mesh.topology()(highest_dim - 1, 0)().reshape(
mesh.num_facets(), highest_dim)
# from dolfin import MeshFunction
# # Create and initialise the mesh function
# facet_mark_function = MeshFunction ( 'uint', mesh, highest_dim-1 )
# facet_mark_function.set_all( 0 )
handler.start_meshfunction("facet_region", highest_dim - 1,
mesh.num_facets())
facets_to_check = range(mesh.num_facets())
data = [int(0 * k) for k in range(len(facets_to_check))]
for i, physical_region in enumerate(physical_regions):
nodes = [
n - 1
for n in vertices_used[highest_dim -
1][2 * i:(2 * i + highest_dim)]
]
nodes.sort()
if physical_region != 0:
found = False
for j in range(len(facets_to_check)):
index = facets_to_check[j]
if all(facets_as_nodes[index, k] == nodes[k]
for k in range(len(nodes))):
found = True
facets_to_check.pop(j)
# set the value of the mesh function
# facet_mark_function[index] = physical_region
data[index] = physical_region
break
if not found:
raise Exception(
"The facet (%d) was not found to mark: %s" %
(i, nodes))
# fname = os.path.splitext('tmp.xml')[0]
# mesh_function_file = File("%s_%s.xml" % (fname, "facet_region"))
# mesh_function_file << facet_mark_function
for index, physical_region in enumerate(data):
handler.add_entity_meshfunction(index, physical_region)
handler.end_meshfunction()
mf = MeshFunction('uint', mesh, 'tmp_facet_region.xml')
plot(mf, interactive=True)
# Check that we got all data
if state == 10:
print "Conversion done"
else:
_error(
"Missing data, unable to convert \n\ Did you use version 2.0 of the gmsh file format?"
)
# Close files
ifile.close()
def create_submesh(mesh, markers):
mpi_comm = mesh.mpi_comm()
if not has_pybind11():
mpi_comm = mpi_comm.tompi4py()
assert isinstance(markers, MeshFunctionBool)
assert markers.dim() == mesh.topology().dim()
marker_id = True
# == 1. Extract marked cells == #
# Dolfin does not support a distributed mesh that is empty on some processes.
# cbcpost gets around this by moving a single cell from the a non-empty processor to an empty one.
# Note that, however, this cannot work if the number of marked cell is less than the number of processors.
# In the interest of considering this case, we enable at least one cell (arbitrarily) on each processor.
# We find this solution acceptable for our purposes, despite the increase of the reduced mesh size,
# since we are never actually interested in solving a PDE on the reduced mesh, but rather only in
# assemblying tensors on it and extract their values at some locations.
backup_first_marker_id = None
if marker_id not in markers.array():
backup_first_marker_id = markers.array()[0]
markers.array()[0] = marker_id
assert marker_id in markers.array()
# == 2. Create submesh == #
submesh = Mesh(mesh.mpi_comm())
mesh_editor = MeshEditor()
mesh_editor.open(submesh,
mesh.ufl_cell().cellname(),
mesh.ufl_cell().topological_dimension(),
mesh.ufl_cell().geometric_dimension())
# Extract cells from mesh with specified marker_id
mesh_cell_indices = where(markers.array() == marker_id)[0]
mesh_cells = mesh.cells()[mesh_cell_indices]
mesh_global_cell_indices = sorted([mesh.topology().global_indices(mesh.topology().dim())[cell_index] for cell_index in mesh_cell_indices])
# Get vertices of extracted cells
mesh_vertex_indices = unique(mesh_cells.flatten())
mesh_global_vertex_indices = sorted([mesh.topology().global_indices(0)[vertex_index] for vertex_index in mesh_vertex_indices])
# Number vertices in a way which is independent from the number of processors. To do so ...
# ... first of all collect all vertices from all processors
allgathered_mesh_global_vertex_indices__non_empty_processors = list()
allgathered_mesh_global_vertex_indices__empty_processors = list()
for r in range(mpi_comm.size):
backup_first_marker_id_r = mpi_comm.bcast(backup_first_marker_id, root=r)
if backup_first_marker_id_r is None:
allgathered_mesh_global_vertex_indices__non_empty_processors.extend(mpi_comm.bcast(mesh_global_vertex_indices, root=r))
else:
allgathered_mesh_global_vertex_indices__empty_processors.extend(mpi_comm.bcast(mesh_global_vertex_indices, root=r))
allgathered_mesh_global_vertex_indices__non_empty_processors = sorted(unique(allgathered_mesh_global_vertex_indices__non_empty_processors))
allgathered_mesh_global_vertex_indices__empty_processors = sorted(unique(allgathered_mesh_global_vertex_indices__empty_processors))
# ... then create a dict that will contain the map from mesh global vertex index to submesh global vertex index.
# ... Here make sure to number first "real" vertices (those coming from non empty processors), since the other ones
# ... are just a side effect of the current partitioning!
allgathered_mesh_to_submesh_vertex_global_indices = dict()
_submesh_vertex_global_index = 0
for mesh_vertex_global_index in allgathered_mesh_global_vertex_indices__non_empty_processors:
assert mesh_vertex_global_index not in allgathered_mesh_to_submesh_vertex_global_indices
allgathered_mesh_to_submesh_vertex_global_indices[mesh_vertex_global_index] = _submesh_vertex_global_index
_submesh_vertex_global_index += 1
for mesh_vertex_global_index in allgathered_mesh_global_vertex_indices__empty_processors:
if mesh_vertex_global_index not in allgathered_mesh_to_submesh_vertex_global_indices:
allgathered_mesh_to_submesh_vertex_global_indices[mesh_vertex_global_index] = _submesh_vertex_global_index
_submesh_vertex_global_index += 1
# Number cells in a way which is independent from the number of processors. To do so ...
# ... first of all collect all cells from all processors
allgathered_mesh_global_cell_indices__non_empty_processors = list()
allgathered_mesh_global_cell_indices__empty_processors = list()
for r in range(mpi_comm.size):
backup_first_marker_id_r = mpi_comm.bcast(backup_first_marker_id, root=r)
if backup_first_marker_id_r is None:
allgathered_mesh_global_cell_indices__non_empty_processors.extend(mpi_comm.bcast(mesh_global_cell_indices, root=r))
else:
allgathered_mesh_global_cell_indices__empty_processors.extend(mpi_comm.bcast(mesh_global_cell_indices, root=r))
allgathered_mesh_global_cell_indices__non_empty_processors = sorted(unique(allgathered_mesh_global_cell_indices__non_empty_processors))
allgathered_mesh_global_cell_indices__empty_processors = sorted(unique(allgathered_mesh_global_cell_indices__empty_processors))
# ... then create a dict that will contain the map from mesh global cell index to submesh global cell index.
# ... Here make sure to number first "real" vertices (those coming from non empty processors), since the other ones
# ... are just a side effect of the current partitioning!
allgathered_mesh_to_submesh_cell_global_indices = dict()
_submesh_cell_global_index = 0
for mesh_cell_global_index in allgathered_mesh_global_cell_indices__non_empty_processors:
assert mesh_cell_global_index not in allgathered_mesh_to_submesh_cell_global_indices
allgathered_mesh_to_submesh_cell_global_indices[mesh_cell_global_index] = _submesh_cell_global_index
_submesh_cell_global_index += 1
for mesh_cell_global_index in allgathered_mesh_global_cell_indices__empty_processors:
assert mesh_cell_global_index not in allgathered_mesh_to_submesh_cell_global_indices
allgathered_mesh_to_submesh_cell_global_indices[mesh_cell_global_index] = _submesh_cell_global_index
_submesh_cell_global_index += 1
# Also create a mapping from mesh local vertex index to submesh local vertex index.
mesh_to_submesh_vertex_local_indices = dict(zip(mesh_vertex_indices, list(range(len(mesh_vertex_indices)))))
# Also create a mapping from mesh local cell index to submesh local cell index.
mesh_to_submesh_cell_local_indices = dict(zip(mesh_cell_indices, list(range(len(mesh_cell_indices)))))
# Now, define submesh cells
submesh_cells = list()
for i, c in enumerate(mesh_cells):
submesh_cells.append([mesh_to_submesh_vertex_local_indices[j] for j in c])
# Store vertices as submesh_vertices[local_index] = (global_index, coordinates)
submesh_vertices = dict()
for mesh_vertex_local_index, submesh_vertex_local_index in mesh_to_submesh_vertex_local_indices.items():
submesh_vertices[submesh_vertex_local_index] = (
allgathered_mesh_to_submesh_vertex_global_indices[mesh.topology().global_indices(0)[mesh_vertex_local_index]],
mesh.coordinates()[mesh_vertex_local_index]
)
# Collect the global number of vertices and cells
global_num_cells = mpi_comm.allreduce(len(submesh_cells), op=SUM)
global_num_vertices = len(allgathered_mesh_to_submesh_vertex_global_indices)
# Fill in mesh_editor
mesh_editor.init_vertices_global(len(submesh_vertices), global_num_vertices)
mesh_editor.init_cells_global(len(submesh_cells), global_num_cells)
for local_index, cell_vertices in enumerate(submesh_cells):
if has_pybind11():
mesh_editor.add_cell(local_index, cell_vertices)
else:
mesh_editor.add_cell(local_index, *cell_vertices)
for local_index, (global_index, coordinates) in submesh_vertices.items():
mesh_editor.add_vertex_global(local_index, global_index, coordinates)
mesh_editor.close()
# Initialize topology
submesh.topology().init(0, len(submesh_vertices), global_num_vertices)
submesh.topology().init(mesh.ufl_cell().topological_dimension(), len(submesh_cells), global_num_cells)
# Correct the global index of cells
for local_index in range(len(submesh_cells)):
submesh.topology().set_global_index(
submesh.topology().dim(),
local_index,
allgathered_mesh_to_submesh_cell_global_indices[mesh_global_cell_indices[local_index]]
)
# == 3. Store (local) mesh to/from submesh map for cells, facets and vertices == #
# Cells
submesh.mesh_to_submesh_cell_local_indices = mesh_to_submesh_cell_local_indices
submesh.submesh_to_mesh_cell_local_indices = mesh_cell_indices
# Vertices
submesh.mesh_to_submesh_vertex_local_indices = mesh_to_submesh_vertex_local_indices
submesh.submesh_to_mesh_vertex_local_indices = mesh_vertex_indices
# Facets
mesh_vertices_to_mesh_facets = dict()
mesh_facets_to_mesh_vertices = dict()
for mesh_cell_index in mesh_cell_indices:
mesh_cell = Cell(mesh, mesh_cell_index)
for mesh_facet in facets(mesh_cell):
mesh_facet_vertices = list()
for mesh_facet_vertex in vertices(mesh_facet):
mesh_facet_vertices.append(mesh_facet_vertex.index())
mesh_facet_vertices = tuple(sorted(mesh_facet_vertices))
if mesh_facet_vertices in mesh_vertices_to_mesh_facets:
assert mesh_vertices_to_mesh_facets[mesh_facet_vertices] == mesh_facet.index()
else:
mesh_vertices_to_mesh_facets[mesh_facet_vertices] = mesh_facet.index()
if mesh_facet.index() in mesh_facets_to_mesh_vertices:
assert mesh_facets_to_mesh_vertices[mesh_facet.index()] == mesh_facet_vertices
else:
mesh_facets_to_mesh_vertices[mesh_facet.index()] = mesh_facet_vertices
submesh_vertices_to_submesh_facets = dict()
submesh_facets_to_submesh_vertices = dict()
for submesh_facet in facets(submesh):
submesh_facet_vertices = list()
for submesh_facet_vertex in vertices(submesh_facet):
submesh_facet_vertices.append(submesh_facet_vertex.index())
submesh_facet_vertices = tuple(sorted(submesh_facet_vertices))
assert submesh_facet_vertices not in submesh_vertices_to_submesh_facets
submesh_vertices_to_submesh_facets[submesh_facet_vertices] = submesh_facet.index()
assert submesh_facet.index() not in submesh_facets_to_submesh_vertices
submesh_facets_to_submesh_vertices[submesh_facet.index()] = submesh_facet_vertices
mesh_to_submesh_facets_local_indices = dict()
for (mesh_facet_index, mesh_vertices) in mesh_facets_to_mesh_vertices.items():
submesh_vertices = tuple(sorted([submesh.mesh_to_submesh_vertex_local_indices[mesh_vertex] for mesh_vertex in mesh_vertices]))
submesh_facet_index = submesh_vertices_to_submesh_facets[submesh_vertices]
mesh_to_submesh_facets_local_indices[mesh_facet_index] = submesh_facet_index
submesh_to_mesh_facets_local_indices = dict()
for (submesh_facet_index, submesh_vertices) in submesh_facets_to_submesh_vertices.items():
mesh_vertices = tuple(sorted([submesh.submesh_to_mesh_vertex_local_indices[submesh_vertex] for submesh_vertex in submesh_vertices]))
mesh_facet_index = mesh_vertices_to_mesh_facets[mesh_vertices]
submesh_to_mesh_facets_local_indices[submesh_facet_index] = mesh_facet_index
submesh.mesh_to_submesh_facet_local_indices = mesh_to_submesh_facets_local_indices
submesh.submesh_to_mesh_facet_local_indices = list()
assert min(submesh_to_mesh_facets_local_indices.keys()) == 0
assert max(submesh_to_mesh_facets_local_indices.keys()) == len(submesh_to_mesh_facets_local_indices.keys()) - 1
for submesh_facet_index in range(len(submesh_to_mesh_facets_local_indices)):
submesh.submesh_to_mesh_facet_local_indices.append(submesh_to_mesh_facets_local_indices[submesh_facet_index])
# == 3bis. Prepare (temporary) global indices of facets == #
# Wrapper to DistributedMeshTools::number_entities
if has_pybind11():
cpp_code = """
#include <pybind11/pybind11.h>
#include <dolfin/mesh/DistributedMeshTools.h>
#include <dolfin/mesh/Mesh.h>
void initialize_global_indices(std::shared_ptr<dolfin::Mesh> mesh, std::size_t dim)
{
dolfin::DistributedMeshTools::number_entities(*mesh, dim);
}
PYBIND11_MODULE(SIGNATURE, m)
{
m.def("initialize_global_indices", &initialize_global_indices);
}
"""
initialize_global_indices = compile_cpp_code(cpp_code).initialize_global_indices
else:
cpp_code = """
void initialize_global_indices(Mesh & mesh, std::size_t dim)
{
DistributedMeshTools::number_entities(mesh, dim);
}
"""
initialize_global_indices = compile_extension_module(cpp_code, additional_system_headers=["dolfin/mesh/DistributedMeshTools.h"]).initialize_global_indices
initialize_global_indices(mesh, mesh.topology().dim() - 1)
# Prepare global indices of facets
mesh_facets_local_to_global_indices = dict()
for mesh_cell_index in mesh_cell_indices:
mesh_cell = Cell(mesh, mesh_cell_index)
for mesh_facet in facets(mesh_cell):
mesh_facets_local_to_global_indices[mesh_facet.index()] = mesh_facet.global_index()
mesh_facets_global_indices_in_submesh = list()
for mesh_facet_local_index in mesh_to_submesh_facets_local_indices.keys():
mesh_facets_global_indices_in_submesh.append(mesh_facets_local_to_global_indices[mesh_facet_local_index])
allgathered__mesh_facets_global_indices_in_submesh = list()
for r in range(mpi_comm.size):
allgathered__mesh_facets_global_indices_in_submesh.extend(mpi_comm.bcast(mesh_facets_global_indices_in_submesh, root=r))
allgathered__mesh_facets_global_indices_in_submesh = sorted(set(allgathered__mesh_facets_global_indices_in_submesh))
mesh_to_submesh_facets_global_indices = dict()
for (submesh_facet_global_index, mesh_facet_global_index) in enumerate(allgathered__mesh_facets_global_indices_in_submesh):
mesh_to_submesh_facets_global_indices[mesh_facet_global_index] = submesh_facet_global_index
submesh_facets_local_to_global_indices = dict()
for (submesh_facet_local_index, mesh_facet_local_index) in submesh_to_mesh_facets_local_indices.items():
submesh_facets_local_to_global_indices[submesh_facet_local_index] = mesh_to_submesh_facets_global_indices[mesh_facets_local_to_global_indices[mesh_facet_local_index]]
# == 4. Assign shared vertices == #
shared_entities_dimensions = {
"vertex": 0,
"facet": submesh.topology().dim() - 1,
"cell": submesh.topology().dim()
}
shared_entities_class = {
"vertex": Vertex,
"facet": Facet,
"cell": Cell
}
shared_entities_iterator = {
"vertex": vertices,
"facet": facets,
"cell": cells
}
shared_entities_submesh_global_index_getter = {
"vertex": lambda entity: entity.global_index(),
"facet": lambda entity: submesh_facets_local_to_global_indices[entity.index()],
"cell": lambda entity: entity.global_index()
}
for entity_type in ["vertex", "facet", "cell"]: # do not use .keys() because the order is important
dim = shared_entities_dimensions[entity_type]
class_ = shared_entities_class[entity_type]
iterator = shared_entities_iterator[entity_type]
submesh_global_index_getter = shared_entities_submesh_global_index_getter[entity_type]
# Get shared entities from mesh. A subset of these will end being shared entities also the submesh
# (thanks to the fact that we do not redistribute cells from one processor to another)
if mpi_comm.size > 1: # some entities may not be initialized in serial, since they are not needed
assert mesh.topology().have_shared_entities(dim), "Mesh shared entities have not been initialized for dimension " + str(dim)
if mesh.topology().have_shared_entities(dim): # always true in parallel (when really needed)
# However, it may happen that an entity which has been selected is not shared anymore because only one of
# the sharing processes has it in the submesh. For instance, consider the case
# of two cells across the interface (located on a facet f) between two processors. It may happen that
# only one of the two cells is selected: the facet f and its vertices are not shared anymore!
# For this reason, we create a new dict from global entity index to processors sharing them. Thus ...
# ... first of all get global indices corresponding to local entities
if entity_type in ["vertex", "cell"]:
assert submesh.topology().have_global_indices(dim), "Submesh global indices have not been initialized for dimension " + str(dim)
submesh_local_entities_global_index = list()
submesh_local_entities_global_to_local_index = dict()
for entity in iterator(submesh):
local_entity_index = entity.index()
global_entity_index = submesh_global_index_getter(entity)
submesh_local_entities_global_index.append(global_entity_index)
submesh_local_entities_global_to_local_index[global_entity_index] = local_entity_index
# ... then gather all global indices from all processors
gathered__submesh_local_entities_global_index = list() # over processor id
for r in range(mpi_comm.size):
gathered__submesh_local_entities_global_index.append(mpi_comm.bcast(submesh_local_entities_global_index, root=r))
# ... then create dict from global index to processors sharing it
submesh_shared_entities__global = dict()
for r in range(mpi_comm.size):
for global_entity_index in gathered__submesh_local_entities_global_index[r]:
if global_entity_index not in submesh_shared_entities__global:
submesh_shared_entities__global[global_entity_index] = list()
submesh_shared_entities__global[global_entity_index].append(r)
# ... and finally popuplate shared entities dict, which is the same as the dict above except that
# the current processor rank is removed and a local indexing is used
submesh_shared_entities = dict() # from local index to list of integers
for (global_entity_index, processors) in submesh_shared_entities__global.items():
if (
mpi_comm.rank in processors # only local entities
and
len(processors) > 1 # it was still shared after submesh extraction
):
other_processors_list = list(processors)
other_processors_list.remove(mpi_comm.rank)
other_processors = array(other_processors_list, dtype=uintp)
submesh_shared_entities[submesh_local_entities_global_to_local_index[global_entity_index]] = other_processors
# Need an extension module to populate shared_entities because in python each call to shared_entities
# returns a temporary.
if has_pybind11():
cpp_code = """
#include <Eigen/Core>
#include <pybind11/pybind11.h>
#include <pybind11/eigen.h>
#include <dolfin/mesh/Mesh.h>
using OtherProcesses = Eigen::Ref<const Eigen::Matrix<std::size_t, Eigen::Dynamic, 1>>;
void set_shared_entities(std::shared_ptr<dolfin::Mesh> submesh, std::size_t idx, const OtherProcesses other_processes, std::size_t dim)
{
std::set<unsigned int> set_other_processes;
for (std::size_t i(0); i < other_processes.size(); i++)
set_other_processes.insert(other_processes[i]);
submesh->topology().shared_entities(dim)[idx] = set_other_processes;
}
PYBIND11_MODULE(SIGNATURE, m)
{
m.def("set_shared_entities", &set_shared_entities);
}
"""
set_shared_entities = compile_cpp_code(cpp_code).set_shared_entities
else:
cpp_code = """
void set_shared_entities(Mesh & submesh, std::size_t idx, const Array<std::size_t>& other_processes, std::size_t dim)
{
std::set<unsigned int> set_other_processes;
for (std::size_t i(0); i < other_processes.size(); i++)
set_other_processes.insert(other_processes[i]);
submesh.topology().shared_entities(dim)[idx] = set_other_processes;
}
"""
set_shared_entities = compile_extension_module(cpp_code).set_shared_entities
for (submesh_entity_local_index, other_processors) in submesh_shared_entities.items():
set_shared_entities(submesh, submesh_entity_local_index, other_processors, dim)
log(DEBUG, "Local indices of shared entities for dimension " + str(dim) + ": " + str(list(submesh.topology().shared_entities(0).keys())))
log(DEBUG, "Global indices of shared entities for dimension " + str(dim) + ": " + str([class_(submesh, local_index).global_index() for local_index in submesh.topology().shared_entities(dim).keys()]))
# == 5. Also initialize submesh facets global indices, now that shared facets have been computed == #
initialize_global_indices(submesh, submesh.topology().dim() - 1) # note that DOLFIN might change the numbering when compared to the one at 3bis
# == 6. Restore backup_first_marker_id and return == #
if backup_first_marker_id is not None:
markers.array()[0] = backup_first_marker_id
return submesh
def load_geometry_from_h5(
h5name,
h5group="",
fendo=None,
fepi=None,
include_sheets=True,
comm=mpi_comm_world,
):
"""Load geometry and other mesh data from
a h5file to an object.
If the file contains muliple fiber fields
you can spefify the angles, and if the file
contais sheets and cross-sheets this can also
be included
:param str h5name: Name of the h5file
:param str h5group: The group within the file
:param int fendo: Helix fiber angle (endocardium) (if available)
:param int fepi: Helix fiber angle (epicardium) (if available)
:param bool include_sheets: Include sheets and cross-sheets
:returns: An object with geometry data
:rtype: object
"""
# Set default groups
ggroup = "{}/geometry".format(h5group)
mgroup = "{}/mesh".format(ggroup)
lgroup = "{}/local basis functions".format(h5group)
fgroup = "{}/microstructure".format(h5group)
if not os.path.isfile(h5name):
raise IOError("File {} does not exist".format(h5name))
# Check that the given file contains
# the geometry in the given h5group
if not check_h5group(h5name, mgroup, delete=False, comm=comm):
msg = ("Error!\nGroup: '{}' does not exist in file:"
"\n{}").format(mgroup, h5name)
with h5py.File(h5name) as h:
keys = h.keys()
msg += "\nPossible values for the h5group are {}".format(keys)
raise IOError(msg)
# Dummy class to store attributes in
class Geometry(object):
pass
geo = Geometry()
with HDF5File(comm, h5name, "r") as h5file:
# Load mesh
mesh = Mesh(comm)
h5file.read(mesh, mgroup, False)
geo.mesh = mesh
# Get mesh functions
meshfunctions = ["vfun", "efun", "ffun", "cfun"]\
if mesh.topology().dim() == 3 else ["vfun", "ffun", "cfun"]
for dim, attr in enumerate(meshfunctions):
dgroup = "{}/mesh/meshfunction_{}".format(ggroup, dim)
mf = MeshFunction("size_t", mesh, dim, mesh.domains())
if h5file.has_dataset(dgroup):
h5file.read(mf, dgroup)
setattr(geo, attr, mf)
load_local_basis(h5file, lgroup, mesh, geo)
load_microstructure(h5file, fgroup, mesh, geo, include_sheets)
# Load the boundary markers
markers = load_markers(h5file, mesh, ggroup, dgroup)
geo.markers = markers
origmeshgroup = "{}/original_geometry".format(h5group)
if h5file.has_dataset(origmeshgroup):
original_mesh = Mesh(comm)
h5file.read(original_mesh, origmeshgroup, True)
setattr(geo, "original_geometry", original_mesh)
for attr in meshfunctions:
if not hasattr(geo, attr):
setattr(geo, attr, None)
for attr in (["f0", "s0", "n0", "r0", "c0", "l0"]):
if not hasattr(geo, attr):
setattr(geo, attr, None)
return geo
def create_slice(basemesh, point, normal, closest_region=False, crinkle_clip=False):
"""Create a slicemesh from a basemesh.
:param basemesh: Mesh to slice
:param point: Point in slicing plane
:param normal: Normal to slicing plane
:param closest_region: Set to True to extract disjoint region closest to specified point
:param crinkle_clip: Set to True to return mesh of same topological dimension as basemesh
.. note::
Only 3D-meshes currently supported for slicing.
.. warning::
Slice-instances are intended for visualization only, and may produce erronous
results if used for computations.
"""
assert basemesh.geometry().dim() == 3, "Can only slice 3D-meshes."
P = np.array([point[0], point[1], point[2]], dtype=np.double)
# Create unit normal
n = np.array([normal[0],normal[1], normal[2]])
n = n/np.linalg.norm(n)
#self.n = Constant((n[0], n[1], n[2]))
# Calculate the distribution of vertices around the plane
# (sign of np.dot(p-P, n) determines which side of the plane p is on)
vsplit = np.dot(basemesh.coordinates()-P, n)
# Count each cells number of vertices on the "positive" side of the plane
# Only cells with vertices on both sides of the plane intersect the plane
operator = np.less
npos = np.sum(vsplit[basemesh.cells()] < 0, 1)
intersection_cells = basemesh.cells()[(npos > 0) & (npos < 4)]
if len(intersection_cells) == 0:
# Try to put "zeros" on other side of plane
# FIXME: handle cells with vertices exactly intersecting the plane in a more robust manner.
operator = np.greater
npos = np.sum(vsplit[basemesh.cells()] > 0, 1)
#cell_indices = (npos > 0) & (npos < 4)
intersection_cells = basemesh.cells()[(npos > 0) & (npos < 4)]
if crinkle_clip:
cf = CellFunction("size_t", basemesh)
cf.set_all(0)
cf.array()[(npos>0) & (npos<4)] = 1
mesh = create_submesh(basemesh, cf, 1)
else:
def add_cell(cells, cell):
# Split cell into triangles
for i in xrange(len(cell)-2):
cells.append(cell[i:i+3])
cells = []
index = 0
indexes = {}
for c in intersection_cells:
a = operator(vsplit[c], 0)
positives = c[np.where(a==True)[0]]
negatives = c[np.where(a==False)[0]]
cell = []
for pp_ind in positives:
pp = basemesh.coordinates()[pp_ind]
for pn_ind in negatives:
pn = basemesh.coordinates()[pn_ind]
if (pp_ind, pn_ind) not in indexes:
# Calculate intersection point with the plane
d = np.dot(P-pp, n)/np.dot(pp-pn, n)
ip = pp+(pp-pn)*d
indexes[(pp_ind, pn_ind)] = (index, ip)
index += 1
cell.append(indexes[(pp_ind, pn_ind)][0])
add_cell(cells, cell)
MPI.barrier(mpi_comm_world())
# Assign global indices
# TODO: Assign global indices properly
dist = distribution(index)
global_idx = sum(dist[:MPI.rank(mpi_comm_world())])
vertices = {}
for idx, p in indexes.values():
vertices[idx] = (global_idx, p)
global_idx += 1
global_num_cells = MPI.sum(mpi_comm_world(), len(cells))
global_num_vertices = MPI.sum(mpi_comm_world(), len(vertices))
mesh = Mesh()
# Return empty mesh if no intersections were found
if global_num_cells == 0:
mesh_editor = MeshEditor()
mesh_editor.open(mesh, "triangle", 2, 3)
mesh_editor.init_vertices(0)
mesh_editor.init_cells(0)
mesh_editor.close()
else:
# Distribute mesh if empty on any processors
cells, vertices = distribute_meshdata(cells, vertices)
# Build mesh
mesh_editor = MeshEditor()
mesh_editor.open(mesh, "triangle", 2, 3)
mesh_editor.init_vertices(len(vertices))
mesh_editor.init_cells(len(cells))
for index, cell in enumerate(cells):
mesh_editor.add_cell(index, cell[0], cell[1], cell[2])
for local_index, (global_index, coordinates) in vertices.items():
mesh_editor.add_vertex_global(int(local_index), int(global_index), coordinates)
mesh_editor.close()
mesh.topology().init(0, len(vertices), global_num_vertices)
mesh.topology().init(2, len(cells), global_num_cells)
if closest_region and mesh.size_global(0) > 0:
assert MPI.size(mpi_comm_world())==1, "Extract closest region does not work in parallel"
regions = compute_connectivity(mesh)
i,d = mesh.bounding_box_tree().compute_closest_entity(Point(P))
if d == MPI.min(mesh.mpi_comm(), d):
v = regions[int(i)]
else:
v = 0
v = MPI.max(mesh.mpi_comm(), v)
mesh = create_submesh(mesh, regions, v)
return mesh
def test_convert_triangle(self): # Disabled because it fails, see FIXME below
# test no. 1
from dolfin import Mesh, MPI
if MPI.num_processes() != 1:
return
fname = os.path.join("data", "triangle")
dfname = fname+".xml"
# Read triangle file and convert to a dolfin xml mesh file
meshconvert.triangle2xml(fname, dfname)
# Read in dolfin mesh and check number of cells and vertices
mesh = Mesh(dfname)
self.assertEqual(mesh.num_vertices(), 96)
self.assertEqual(mesh.num_cells(), 159)
# Clean up
os.unlink(dfname)
# test no. 2
from dolfin import MPI, Mesh, MeshFunction, \
edges, Edge, faces, Face, \
SubsetIterator, facets, CellFunction
if MPI.num_processes() != 1:
return
fname = os.path.join("data", "test_Triangle_3")
dfname = fname+".xml"
dfname0 = fname+".attr0.xml"
# Read triangle file and convert to a dolfin xml mesh file
meshconvert.triangle2xml(fname, dfname)
# Read in dolfin mesh and check number of cells and vertices
mesh = Mesh(dfname)
mesh.init()
mfun = MeshFunction('double', mesh, dfname0)
self.assertEqual(mesh.num_vertices(), 58)
self.assertEqual(mesh.num_cells(), 58)
# Create a size_t CellFunction and assign the values based on the
# converted Meshfunction
cf = CellFunction("size_t", mesh)
cf.array()[mfun.array()==10.0] = 0
cf.array()[mfun.array()==-10.0] = 1
# Meassure total area of cells with 1 and 2 marker
add = lambda x, y : x+y
area0 = reduce(add, (Face(mesh, cell.index()).area() \
for cell in SubsetIterator(cf, 0)), 0.0)
area1 = reduce(add, (Face(mesh, cell.index()).area() \
for cell in SubsetIterator(cf, 1)), 0.0)
total_area = reduce(add, (face.area() for face in faces(mesh)), 0.0)
# Check that all cells in the two domains are either above or below y=0
self.assertTrue(all(cell.midpoint().y()<0 for cell in SubsetIterator(cf, 0)))
self.assertTrue(all(cell.midpoint().y()>0 for cell in SubsetIterator(cf, 1)))
# Check that the areas add up
self.assertAlmostEqual(area0+area1, total_area)
# Measure the edge length of the two edge domains
#edge_markers = mesh.domains().facet_domains()
edge_markers = mesh.domains().markers(mesh.topology().dim()-1)
self.assertTrue(edge_markers is not None)
#length0 = reduce(add, (Edge(mesh, e.index()).length() \
# for e in SubsetIterator(edge_markers, 0)), 0.0)
length0, length1 = 0.0, 0.0
for item in edge_markers.items():
if item[1] == 0:
e = Edge(mesh, int(item[0]))
length0 += Edge(mesh, int(item[0])).length()
elif item [1] == 1:
length1 += Edge(mesh, int(item[0])).length()
# Total length of all edges and total length of boundary edges
total_length = reduce(add, (e.length() for e in edges(mesh)), 0.0)
boundary_length = reduce(add, (Edge(mesh, f.index()).length() \
for f in facets(mesh) if f.exterior()), 0.0)
# Check that the edges add up
self.assertAlmostEqual(length0 + length1, total_length)
self.assertAlmostEqual(length1, boundary_length)
# Clean up
os.unlink(dfname)
os.unlink(dfname0)
h5_file = convert(args.input)
# VTK visualize tags
if args.save_pvd or args.mesh_size:
h5 = HDF5File(mpi_comm_world(), h5_file, 'r')
mesh = Mesh()
h5.read(mesh, 'mesh', False)
info('Mesh has %d cells' % mesh.num_cells())
info('Mesh has %d vertices' % mesh.num_vertices())
info('Box size %s' %
(mesh.coordinates().max(axis=0) - mesh.coordinates().min(axis=0)))
hmin, hmax = mesh.hmin(), mesh.hmax()
info('Mesh has sizes %g %g' % (hmin, hmax))
root = os.path.splitext(args.input)[0]
tdim = mesh.topology().dim()
data_sets = ('curves', 'surfaces', 'volumes')
dims = (1, tdim - 1, tdim)
for ds, dim in zip(data_sets, dims):
if h5.has_dataset(ds):
f = MeshFunction('size_t', mesh, dim, 0)
h5.read(f, ds)
if args.save_pvd:
File('%s_%s.pvd' % (root, ds)) << f
cleanup(exts=args.cleanup)
def gmsh2xml(ifilename, handler):
"""Convert between .gmsh v2.0 format (http://www.geuz.org/gmsh/) and .xml,
parser implemented as a state machine:
0 = read 'MeshFormat'
1 = read mesh format data
2 = read 'EndMeshFormat'
3 = read 'Nodes'
4 = read number of vertices
5 = read vertices
6 = read 'EndNodes'
7 = read 'Elements'
8 = read number of cells
9 = read cells
10 = done
Afterwards, extract physical region numbers if they are defined in
the mesh file as a mesh function.
"""
print "Converting from Gmsh format (.msh, .gmsh) to DOLFIN XML format"
# The dimension of the gmsh element types supported here as well as the dolfin cell types for each dimension
gmsh_dim = {15: 0, 1: 1, 2: 2, 4: 3}
cell_type_for_dim = {1: "interval", 2: "triangle", 3: "tetrahedron" }
# the gmsh element types supported for conversion
supported_gmsh_element_types = [1, 2, 4, 15]
# Open files
ifile = open(ifilename, "r")
# Scan file for cell type
cell_type = None
highest_dim = 0
line = ifile.readline()
while line:
# Remove newline
if line[-1] == "\n":
line = line[:-1]
# Read dimension
if line.find("$Elements") == 0:
line = ifile.readline()
num_elements = int(line)
if num_elements == 0:
_error("No elements found in gmsh file.")
line = ifile.readline()
# Now iterate through elements to find largest dimension. Gmsh
# format might include elements of lower dimensions in the element list.
# We also need to count number of elements of correct dimensions.
# Also determine which vertices are not used.
dim_count = {0: 0, 1: 0, 2: 0, 3: 0}
vertices_used_for_dim = {0: [], 1: [], 2: [], 3: []}
# Array used to store gmsh tags for 1D (type 1/line), 2D (type 2/triangular) elements and 3D (type 4/tet) elements
tags_for_dim = {0: [], 1: [], 2: [], 3: []}
while line.find("$EndElements") == -1:
element = line.split()
elem_type = int(element[1])
num_tags = int(element[2])
if elem_type in supported_gmsh_element_types:
dim = gmsh_dim[elem_type]
if highest_dim < dim:
highest_dim = dim
node_num_list = [int(node) for node in element[3 + num_tags:]]
vertices_used_for_dim[dim].extend(node_num_list)
if num_tags > 0:
tags_for_dim[dim].append(tuple(int(tag) for tag in element[3:3+num_tags]))
dim_count[dim] += 1
else:
#TODO: output a warning here. "gmsh element type %d not supported" % elem_type
pass
line = ifile.readline()
else:
# Read next line
line = ifile.readline()
# Check that we got the cell type and set num_cells_counted
if highest_dim == 0:
_error("Unable to find cells of supported type.")
num_cells_counted = dim_count[highest_dim]
vertex_set = set(vertices_used_for_dim[highest_dim])
vertices_used_for_dim[highest_dim] = None
vertex_dict = {}
for n,v in enumerate(vertex_set):
vertex_dict[v] = n
# Step to beginning of file
ifile.seek(0)
# Set mesh type
handler.set_mesh_type(cell_type_for_dim[highest_dim], highest_dim)
# Initialise node list (gmsh does not export all vertexes in order)
nodelist = {}
# Current state
state = 0
# Write data
num_vertices_read = 0
num_cells_read = 0
# Only import the dolfin objects if facet markings exist
process_facets = False
if len(tags_for_dim[highest_dim-1]) > 0:
# first construct the mesh
try:
from dolfin import MeshEditor, Mesh
except ImportError:
_error("DOLFIN must be installed to handle Gmsh boundary regions")
mesh = Mesh()
mesh_editor = MeshEditor ()
mesh_editor.open( mesh, highest_dim, highest_dim )
process_facets = True
else:
# TODO: Output a warning or an error here
me = None
while state != 10:
# Read next line
line = ifile.readline()
if not line: break
# Skip comments
if line[0] == '#':
continue
# Remove newline
if line[-1] == "\n":
line = line[:-1]
if state == 0:
if line == "$MeshFormat":
state = 1
elif state == 1:
(version, file_type, data_size) = line.split()
state = 2
elif state == 2:
if line == "$EndMeshFormat":
state = 3
elif state == 3:
if line == "$Nodes":
state = 4
elif state == 4:
num_vertices = len(vertex_dict)
handler.start_vertices(num_vertices)
if process_facets:
mesh_editor.init_vertices ( num_vertices )
state = 5
elif state == 5:
(node_no, x, y, z) = line.split()
node_no = int(node_no)
x,y,z = [float(xx) for xx in (x,y,z)]
if vertex_dict.has_key(node_no):
node_no = vertex_dict[node_no]
else:
continue
nodelist[int(node_no)] = num_vertices_read
handler.add_vertex(num_vertices_read, [x, y, z])
if process_facets:
if highest_dim == 1:
coords = numpy.array([x])
elif highest_dim == 2:
coords = numpy.array([x, y])
elif highest_dim == 3:
coords = numpy.array([x, y, z])
mesh_editor.add_vertex(num_vertices_read, coords)
num_vertices_read +=1
if num_vertices == num_vertices_read:
handler.end_vertices()
state = 6
elif state == 6:
if line == "$EndNodes":
state = 7
elif state == 7:
if line == "$Elements":
state = 8
elif state == 8:
handler.start_cells(num_cells_counted)
if process_facets:
mesh_editor.init_cells( num_cells_counted )
state = 9
elif state == 9:
element = line.split()
elem_type = int(element[1])
num_tags = int(element[2])
if elem_type in supported_gmsh_element_types:
dim = gmsh_dim[elem_type]
else:
dim = 0
if dim == highest_dim:
node_num_list = [vertex_dict[int(node)] for node in element[3 + num_tags:]]
for node in node_num_list:
if not node in nodelist:
_error("Vertex %d of %s %d not previously defined." %
(node, cell_type_for_dim[dim], num_cells_read))
cell_nodes = [nodelist[n] for n in node_num_list]
handler.add_cell(num_cells_read, cell_nodes)
if process_facets:
cell_nodes = numpy.array([nodelist[n] for n in node_num_list], dtype=numpy.uintp)
mesh_editor.add_cell(num_cells_read, cell_nodes)
num_cells_read +=1
if num_cells_counted == num_cells_read:
handler.end_cells()
if process_facets:
mesh_editor.close()
state = 10
elif state == 10:
break
# Write mesh function based on the Physical Regions defined by
# gmsh, but only if they are not all zero. All zero physical
# regions indicate that no physical regions were defined.
if highest_dim not in [1,2,3]:
_error("Gmsh tags not supported for dimension %i. Probably a bug" % dim)
tags = tags_for_dim[highest_dim]
physical_regions = tuple(tag[0] for tag in tags)
if not all(tag == 0 for tag in physical_regions):
handler.start_meshfunction("physical_region", dim, num_cells_counted)
for i, physical_region in enumerate(physical_regions):
handler.add_entity_meshfunction(i, physical_region)
handler.end_meshfunction()
# Now process the facet markers
tags = tags_for_dim[highest_dim-1]
if (len(tags) > 0) and (mesh is not None):
physical_regions = tuple(tag[0] for tag in tags)
if not all(tag == 0 for tag in physical_regions):
mesh.init(highest_dim-1,0)
# Get the facet-node connectivity information (reshape as a row of node indices per facet)
if highest_dim==1:
# for 1d meshes the mesh topology returns the vertex to vertex map, which isn't what we want
# as facets are vertices
facets_as_nodes = numpy.array([[i] for i in range(mesh.num_facets())])
else:
facets_as_nodes = mesh.topology()(highest_dim-1,0)().reshape ( mesh.num_facets(), highest_dim )
# Build the reverse map
nodes_as_facets = {}
for facet in range(mesh.num_facets()):
nodes_as_facets[tuple(facets_as_nodes[facet,:])] = facet
data = [int(0*k) for k in range(mesh.num_facets()) ]
for i, physical_region in enumerate(physical_regions):
nodes = [n-1 for n in vertices_used_for_dim[highest_dim-1][highest_dim*i:(highest_dim*i+highest_dim)]]
nodes.sort()
if physical_region != 0:
try:
index = nodes_as_facets[tuple(nodes)]
data[index] = physical_region
except IndexError:
raise Exception ( "The facet (%d) was not found to mark: %s" % (i, nodes) )
# # Create and initialise the mesh function
handler.start_meshfunction("facet_region", highest_dim-1, mesh.num_facets() )
for index, physical_region in enumerate ( data ):
handler.add_entity_meshfunction(index, physical_region)
handler.end_meshfunction()
# Check that we got all data
if state == 10:
print "Conversion done"
else:
_error("Missing data, unable to convert \n\ Did you use version 2.0 of the gmsh file format?")
# Close files
ifile.close()
args = parser.parse_args()
# Some sanity
root, ext = os.path.splitext(args.mesh)
assert args.m > 2 and args.n > 2
assert ext == '.h5'
# Typically we have files named foo_ncellsX_ncellsY.h5
assert tuple(map(int, root.split('_')[-2:])) == (args.m, args.n)
# Load the original
h5 = HDF5File(get_comm_world(), args.mesh, 'r')
mesh = Mesh()
h5.read(mesh, 'mesh', False)
surfaces = MeshFunction('size_t', mesh, mesh.topology().dim()-1, 0)
h5.read(surfaces, 'surfaces')
volumes = MeshFunction('size_t', mesh, mesh.topology().dim(), 0)
h5.read(volumes, 'volumes')
h5.close()
# Remove layer
tt = Timer('cleanup')
ncells_x, ncells_y = args.m, args.n
surfaces, volumes = deactivate_cells(surfaces, volumes, ncells_x, ncells_y)
info('Removing boundary took %g s' % tt.stop())
# Write
try:
msh_file, h5_file = args.io[:2]
except ValueError:
msh_file = args.io[0]
root, ext = os.path.splitext(msh_file)
h5_file = '.'.join([root, 'h5'])
assert convert(msh_file, h5_file, args.save_mvc)
if args.save_pvd:
h5 = HDF5File(mpi_comm_world(), h5_file, 'r')
mesh = Mesh()
h5.read(mesh, 'mesh', False)
surfaces = MeshFunction('size_t', mesh, mesh.topology().dim()-1, 0)
volumes = MeshFunction('size_t', mesh, mesh.topology().dim(), 0)
if not args.save_mvc:
h5.read(surfaces, 'surfaces')
h5.read(volumes, 'volumes')
# The data is mesh value collections
else:
from tiling_cpp import fill_mf_from_mvc
surfaces_mvc = MeshValueCollection('size_t', mesh, mesh.topology().dim()-1)
h5.read(surfaces_mvc, 'surfaces')
fill_mf_from_mvc(surfaces_mvc, surfaces)
volumes_mvc = MeshValueCollection('size_t', mesh, mesh.topology().dim())
h5.read(volumes_mvc, 'volumes')
def coil_in_box():
mesh = Mesh("../meshes/2d/coil-in-box.xml")
f = Constant(0.0)
# Define mesh and boundaries.
class LeftBoundary(SubDomain):
def inside(self, x, on_boundary):
return on_boundary and x[0] < GMSH_EPS
left_boundary = LeftBoundary()
class RightBoundary(SubDomain):
def inside(self, x, on_boundary):
return on_boundary and x[0] > 2.5 - GMSH_EPS
right_boundary = RightBoundary()
class LowerBoundary(SubDomain):
def inside(self, x, on_boundary):
return on_boundary and x[1] < GMSH_EPS
lower_boundary = LowerBoundary()
class UpperBoundary(SubDomain):
def inside(self, x, on_boundary):
return on_boundary and x[1] > 0.4 - GMSH_EPS
upper_boundary = UpperBoundary()
class CoilBoundary(SubDomain):
def inside(self, x, on_boundary):
return (
on_boundary
and x[0] > GMSH_EPS
and x[0] < 2.5 - GMSH_EPS
and x[1] > GMSH_EPS
and x[1] < 0.4 - GMSH_EPS
)
coil_boundary = CoilBoundary()
# heater_temp = 380.0
# room_temp = 293.0
# bcs = [(coil_boundary, heater_temp),
# (left_boundary, room_temp),
# (right_boundary, room_temp),
# (upper_boundary, room_temp),
# (lower_boundary, room_temp)
# ]
boundaries = {}
boundaries["left"] = left_boundary
boundaries["right"] = right_boundary
boundaries["upper"] = upper_boundary
boundaries["lower"] = lower_boundary
boundaries["coil"] = coil_boundary
boundaries = MeshFunction("size_t", mesh, mesh.topology().dim() - 1)
boundaries.set_all(0)
left_boundary.mark(boundaries, 1)
right_boundary.mark(boundaries, 2)
upper_boundary.mark(boundaries, 3)
lower_boundary.mark(boundaries, 4)
coil_boundary.mark(boundaries, 5)
boundary_indices = {"left": 1, "right": 2, "top": 3, "bottom": 4, "coil": 5}
theta0 = Constant(293.0)
return mesh, f, boundaries, boundary_indices, theta0