OpenMC Anywhere

OpenMC Monte Carlo Particle Transport Code with unofficial Windows/Apple/Linux pypi wheel (openmc executable + libopenmc shared library).

Let's type pip install openmc-anywhere or uv add openmc-anywhere, and write your script with import openmc

What is OpenMC Anywhere

This is an unofficial binary redistribution of upstream openmc-dev/openmc. The distribution name is openmc-anywhere; the import name is plain openmc, exactly as upstream.

Prebuilt wheel

	Target	Wheel tag	OpenMC	HDF5	DAGMC	MOAB	NJOY
	x86_64-unknown-linux-gnu	manylinux_2_28_x86_64	0.16.0	2.1.1	3.2.4	5.6.0	2016.79
	aarch64-unknown-linux-gnu	manylinux_2_28_aarch64	0.16.0	2.1.1	3.2.4	5.6.0	2016.79
	x86_64-pc-windows-gnu	win_amd64	0.16.0	2.1.1	3.2.4	5.6.0	2016.79
	x86_64-apple-darwin	macosx_11_0_x86_64	0.16.0	2.1.1	3.2.4	5.6.0	2016.79
	aarch64-apple-darwin	macosx_11_0_arm64	0.16.0	2.1.1	3.2.4	5.6.0	2016.79

Getting-started

import openmc
# A 20 cm sphere of natural lithium driven by a 14.1 MeV point source: the tritium breeding ratio comes out at 0.2683.
li = openmc.Material()
li.add_element("Li", 1.0)
li.set_density("g/cm3", 0.534)
sphere = openmc.Sphere(r=20.0, boundary_type="vacuum")
cell = openmc.Cell(fill=li, region=-sphere)

settings = openmc.Settings(run_mode="fixed source", batches=5, particles=10_000)
settings.source = openmc.IndependentSource(
    space=openmc.stats.Point(), energy=openmc.stats.Discrete([14.1e6], [1.0])
)
tally = openmc.Tally(name="tbr")
tally.filters = [openmc.CellFilter(cell)]
tally.scores = ["H3-production"]

model = openmc.Model(openmc.Geometry([cell]), openmc.Materials([li]), settings, openmc.Tallies([tally]))
with openmc.StatePoint(model.run(output=False)) as sp:
    t = sp.get_tally(name="tbr")
    print(f"openmc {openmc.__version__}  TBR = {t.mean.item():.4f} +/- {t.std_dev.item():.4f}")

$ export OPENMC_CROSS_SECTIONS=/path/to/cross_sections.xml   # data is not bundled
$ pip install openmc-anywhere && python main.py
# or
$ uv add openmc-anywhere && uv run main.py

openmc 0.16.0.0  TBR = 0.2683 +/- 0.0004

openmc.data.IncidentNeutron.from_njoy("n-092_U_235.endf", temperatures=[300, 600, 900])

License

This repository's build tooling is MIT (see LICENSE). The redistributed components keep their own terms: OpenMC (MIT), HDF5 (BSD-3-Clause style), DAGMC (BSD-2-Clause), NJOY2016 (LANL BSD-3-Clause style), and MOAB (LGPL-3.0-or-later). MOAB is statically linked into the openmc executable and into libopenmc, so redistributing these wheels carries the LGPL-3.0 obligations for a Combined Work. MOAB is modified here: see src/moab-*.patch.

Thirdparty Licenses

Every license text is in thirdparty-license/, and each wheel ships the same set under <dist-info>/licenses/thirdparty-license/. thirdparty-license/README.md maps each file to the component and version it covers.

Corresponding Source for every redistributed component is this repository at the tag matching the wheel version. Each component is pinned as a git submodule under src/; git submodule status prints the exact upstream revision. make cross-<triple> at that tag rebuilds these binaries, which is how the relink freedom of LGPL-3.0 §4(d)(0) is provided: substitute your own MOAB and rebuild.