Stellarmesh is a meshing library for nuclear workflows. Principally, it supports the creation of DAGMC geometry from CAD models.

Features:

• ✅ Import of CadQuery, build123d, STEP and BREP geometry

• ✅ Surface and volume meshing

• ✅ Gmsh and OpenCASCADE meshing backends

• ✅ Linear and angular mesh tolerances

• ✅ Surface boundary conditions

• ✅ Imprinting and merging of conformal geometry

• ✅ Mesh refinement

• ✅ Programmatic manipulation of .h5m tags

• ✅ Automated testing and integration

Getting Started

• Installation

• Tutorials

• API

Example

import build123d as bd
import stellarmesh as sm

solids = [bd.Solid.make_torus(1000, 100)]
for _ in range(3):
    solids.append(bd.Solid.thicken(solids[-1].faces()[0], 100))
solids = solids[1:]

geometry = sm.Geometry(solids[::-1], material_names=["a", "a", "c"])
mesh = sm.SurfaceMesh.from_geometry(
    geometry, sm.GmshSurfaceOptions(min_mesh_size=50, max_mesh_size=200)
)
mesh.write("test.msh")
mesh.render("docs/torus-mesh-reversed.png", rotation_xyz=(90, 0, -90), normals=15)

h5m = sm.DAGMCModel.from_mesh(mesh)
h5m.write("dagmc.h5m")
h5m.write("dagmc.vtk")

Acknowledgements

Stellarmesh is originally a project of Thea Energy, who are building the world’s first planar coil stellarator.