def front_mesh_symmetric(res=0.025):
"""
Creates a donut mesh with symmetry line through y = c_y
"""
geometry = Geometry()
mesh_r = width_scale*res
c = geometry.add_point((c_x,c_y,0))
# Elliptic obstacle
p1 = geometry.add_point((c_x-r_x, c_y,0))
p2 = geometry.add_point((c_x+r_x, c_y,0))
# embed()
arc_1 = geometry.add_circle_arc(p1, c, p2)
arc_2 = geometry.add_circle_arc(p2, c, p1)
# Surrounding mesh
p3 = geometry.add_point((c_x-r_x-mesh_r, c_y,0))
p4 = geometry.add_point((c_x+r_x+mesh_r, c_y,0))
arc_5 = geometry.add_circle_arc(p3, c, p4)
arc_6 = geometry.add_circle_arc(p4, c, p3)
line_front = geometry.add_line(p3, p1)
line_back = geometry.add_line(p2, p4)
surface_top = geometry.add_line_loop([line_front, arc_1, line_back, -arc_5])
surface_bottom = geometry.add_line_loop([line_front, -arc_2, line_back,
arc_6])
obstacle_loop = geometry.add_line_loop([arc_1, arc_2])
outer_loop = geometry.add_line_loop([arc_5,arc_6])
top = geometry.add_plane_surface(surface_top)
bottom = geometry.add_plane_surface(surface_bottom)
geometry.add_physical_surface([top, bottom],label=12)
geometry.add_physical_line(obstacle_loop.lines, label=inner_marker)
geometry.add_physical_line(outer_loop.lines, label=outer_marker)
# Create refined mesh around geometry
field = geometry.add_boundary_layer(edges_list=obstacle_loop.lines,
hfar=res, hwall_n=res/3,
thickness=0.1*mesh_r)
geometry.add_background_field([field])
# Generate mesh
(points, cells, point_data,
cell_data, field_data) = generate_mesh(geometry, prune_z_0=True,
geo_filename="meshes/test.geo")
# Save mesh and mesh-function to file
meshio.write("multimesh_1.xdmf", meshio.Mesh(
points=points, cells={"triangle": cells["triangle"]}))
meshio.write("mf_1.xdmf", meshio.Mesh(
points=points, cells={"line": cells["line"]},
cell_data={"line": {"name_to_read":
cell_data["line"]["gmsh:physical"]}}))
import os
os.system("mv multimesh_1.* meshes/")
os.system("mv mf_1.* meshes/")
def front_mesh_unsym(res=0.025):
"""
Creates unsymmetric donut mesh
"""
geometry = Geometry()
mesh_r = width_scale*res
c = geometry.add_point((c_x,c_y,0))
# Elliptic obstacle
p1 = geometry.add_point((c_x-r_x, c_y,0),lcar=res/2)
p2 = geometry.add_point((c_x+r_x, c_y,0),lcar=res/2)
arc_1 = geometry.add_circle_arc(p1, c, p2)
arc_2 = geometry.add_circle_arc(p2, c, p1)
# Surrounding mesh
p3 = geometry.add_point((c_x-r_x-mesh_r, c_y,0),lcar=res)
p4 = geometry.add_point((c_x+r_x+mesh_r, c_y,0),lcar=res)
arc_5 = geometry.add_circle_arc(p3, c, p4)
arc_6 = geometry.add_circle_arc(p4, c, p3)
obstacle_loop = geometry.add_line_loop([arc_1, arc_2])
outer_loop = geometry.add_line_loop([arc_5,arc_6])
donut = geometry.add_plane_surface(obstacle_loop, holes=[outer_loop])
geometry.add_physical_surface([donut],label=12)
geometry.add_physical_line(obstacle_loop.lines, label=inner_marker)
geometry.add_physical_line(outer_loop.lines, label=outer_marker)
# Create refined mesh around geometry
# field = geometry.add_boundary_layer(edges_list=obstacle_loop.lines,
# hfar=res, hwall_n=res/3,
# thickness=2*res)
# geometry.add_background_field([field])
# Generate mesh
(points, cells, point_data,
cell_data, field_data) = generate_mesh(geometry, prune_z_0=True,
geo_filename="meshes/test.geo")
# Save mesh and mesh-function to file
meshio.write("meshes/multimesh_1.xdmf", meshio.Mesh(
points=points, cells={"triangle": cells["triangle"]}))
meshio.write("meshes/mf_1.xdmf", meshio.Mesh(
points=points, cells={"line": cells["line"]},
cell_data={"line": {"name_to_read":
cell_data["line"]["gmsh:physical"]}}))
