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nschloe
140 Stars 20 Forks GNU General Public License v3.0 421 Commits 1 Opened issues

Description

Some examples for mesh generation in Python

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meshzoo

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When generating meshes for FEM/FVM computations, sometimes your geometry is so simple that you don't need a complex mesh generator (like pygmsh, MeshPy, mshr, pygalmesh, dmsh), but something simple and fast that makes use of the structure of the domain. Enter meshzoo.

Examples

Triangle

import meshzoo

bary, cells = meshzoo.triangle(8)

corners = numpy.array(

[

[0.0, -0.5 * numpy.sqrt(3.0), +0.5 * numpy.sqrt(3.0)],

[1.0, -0.5, -0.5],

]

)

points = numpy.dot(corners, bary).T

Process the mesh, e.g., write it to a file using meshio

meshio.write_points_cells("triangle.vtk", points, {"triangle": cells})

Rectangle

| | | | :----: | :---: |

import meshzoo

points, cells = meshzoo.rectangle_tri( (0.0, 0.0), (1.0, 1.0), n=11, # or (11, 11) variant="zigzag", # or "up", "down", "center" )

points, cells = meshzoo.rectangle_quad((0.0, 0.0), (1.0, 1.0), n=11)

Regular polygon

| | | | | :----: | :---: | :---: | |

meshzoo.ngon(4, 8)
|
meshzoo.ngon(6, 8)
|
meshzoo.ngon(9, 8)
|
import meshzoo

points, cells = meshzoo.ngon(5, 11)

Disk

| | | | | :----: | :---: | :---: | |

meshzoo.disk(4, 8)
|
meshzoo.disk(6, 8)
|
meshzoo.disk(9, 8)
|

The disk meshes are inflations of regular polygons.

import meshzoo

points, cells = meshzoo.disk(6, 11)

points, cells = meshzoo.disk_quad(10)

Möbius strip

import meshzoo

points, cells = meshzoo.moebius(num_twists=1, nl=60, nw=11)

Sphere (surface)

| | | | :----: | :---: |

import meshzoo

points, cells = meshzoo.uv_sphere(num_points_per_circle=20, num_circles=10, radius=1.0) points, tri, quad = meshzoo.geo_sphere( num_points_per_circle=20, num_circles=10, radius=1.0 )

Spheres can also be generated by refining the faces of platonic solids and then "inflating" them. meshzoo implements a few of them. The sphere generated from the icosahedron has the highest-quality (most equilateral) triangles.

All cells are oriented such that its normal points outwards.

| | | | | :----: | :---: | :---: | |

meshzoo.tetra_sphere(10)
|
meshzoo.octa_sphere(10)
|
meshzoo.icosa_sphere(10)
|

Ball (solid)

| | | | :----: | :---: |

import meshzoo

points, cells = meshzoo.ball_tetra(10) points, cells = meshzoo.ball_hexa(10)

Tube

import meshzoo

points, cells = meshzoo.tube(length=1.0, radius=1.0, n=30)

Cube

| | | | :----: | :---: |

import meshzoo

points, cells = meshzoo.cube_tetra((0.0, 0.0, 0.0), (1.0, 1.0, 1.0), n=11) points, cells = meshzoo.cube_hexa((0.0, 0.0, 0.0), (1.0, 1.0, 1.0), n=11)

Extra, extra

In addition to this, the

examples/
directory contains a couple of instructive examples for other mesh generators.

Installation

meshzoo is available from the Python Package Index, so simply do

pip install meshzoo
to install.

Testing

To run the meshzoo unit tests, check out this repository and run

pytest

License

meshzoo is published under the MIT license.

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