The final step is to set mesh resolutions. setPhysicalName ( 2, obstacle_marker, "Obstacle" ) addPhysicalGroup ( 2, obstacles, obstacle_marker ) gmsh. setPhysicalName ( 2, wall_marker, "Walls" ) gmsh. addPhysicalGroup ( 2, walls, wall_marker ) gmsh. setPhysicalName ( surface, outlet_marker, "Fluid outlet" ) elif np. addPhysicalGroup ( surface, ], outlet_marker ) gmsh. setPhysicalName ( surface, inlet_marker, "Fluid inlet" ) elif np. addPhysicalGroup ( surface, ], inlet_marker ) inlet = surface gmsh. getCenterOfMass ( surface, surface ) if np. getEntities ( dim = 2 ) inlet_marker, outlet_marker, wall_marker, obstacle_marker = 1, 3, 5, 7 walls = obstacles = for surface in surfaces : com = gmsh. This software is published under the GPLv3 license.Surfaces = gmsh. To build, run sphinx-build -b html doc doc/_build To run the pygmsh unit tests, check out this repository and type pytest Where input and output can be any format supported by You can also use the command-line utility pygmsh-optimize input.vtk output.xdmf read ( "mymesh.vtk" ) optimized_mesh = pygmsh. Pygmsh can optimize existing meshes, too. set_mesh_size_callback ( lambda dim, tag, x, y, z : abs ( sqrt ( x ** 2 + y ** 2 + z ** 2 ) - 0.5 ) + 0.1 ) mesh = geom. generate_mesh () # ball with mesh refinement from math import sqrt import pygmsh with pygmsh. generate_mesh () # mesh refinement with callback import pygmsh with pygmsh. set_background_mesh (, operator = "Min" ) mesh = geom. add_boundary_layer ( nodes_list = ], lcmin = 0.05, lcmax = 0.2, distmin = 0.1, distmax = 0.4, ) geom. add_boundary_layer ( edges_list = ], lcmin = 0.05, lcmax = 0.2, distmin = 0.0, distmax = 0.2, ) field1 = geom. # boundary refinement import pygmsh with pygmsh. generate_mesh () Mesh refinement/boundary layers characteristic_length_max = 0.1 rectangle = geom. generate_mesh () # puzzle piece import pygmsh with pygmsh. boolean_union ( cylinders )) mesh = geom. add_ellipsoid (, ) cylinders =, , 0.3 ), geom. characteristic_length_max = 0.1 ellipsoid = geom. generate_mesh () # ellpsoid with holes import pygmsh with pygmsh. boolean_intersection ( disks ) mesh = geom. characteristic_length_max = 0.1 r = 0.5 disks =, 1.0 ), geom. from math import pi, cos import pygmsh with pygmsh. Gmsh also supports OpenCASCADE ( occ), allowing for a CAD-style geometry specification. twist ( poly, translation_axis =, rotation_axis =, point_on_axis =, angle = pi / 3, ) mesh = geom. generate_mesh () from math import pi import pygmsh with pygmsh. revolve ( poly, ,, 0.8 * pi ) mesh = geom. extrude ( poly, , num_layers = 5 ) mesh = geom. You can access Gmsh's native file writer. The output file can be visualized with various tools, e.g., The return value is always a meshio mesh, so to Geometry () as geom : lcar = 0.1 p1 = geom. generate_mesh () import pygmsh with pygmsh. add_circle (, 1.0, mesh_size = 0.2 ) mesh = geom. # mesh.write("out.vtk") import pygmsh with pygmsh. generate_mesh () # mesh.points, mesh.cells. add_polygon (, ,, , ], mesh_size = 0.1, ) mesh = geom. Flat shapesĬodes: import pygmsh with pygmsh. To use, install Gmsh itself and pygmsh from pypi: apt install python3-gmshÄirectory contain many small examples. It provides useful abstractions from Gmsh's own Python interface so you can create Pygmsh combines the power of Gmsh with the versatility of Python.
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