mit-crpg/openmc: OpenMC 0.10.0

This release of OpenMC includes several new features, performance improvements, and bug fixes compared to version 0.9.0. Notably, a C API has been added that enables in-memory coupling of neutronics to other physics fields, e.g., burnup calculations and thermal-hydraulics. The C API is also backed by Python bindings in a new openmc.capi package. Users should be forewarned that the C API is still in an experimental state and the interface is likely to undergo changes in future versions.

The Python API continues to improve over time; several backwards incompatible changes were made in the API which users of previous versions should take note of:

• To indicate that nuclides in a material should be treated such that elastic scattering is isotropic in the laboratory system, there is a new Material.isotropic property:

  mat = openmc.Material() mat.add_nuclide('H1', 1.0) mat.isotropic = ['H1']

  To treat all nuclides in a material this way, the Material.make_isotropic_in_lab method can still be used.

• The initializers for openmc.Intersection and openmc.Union now expect an iterable.

• Auto-generated unique IDs for classes now start from 1 rather than 10000.

NOTE: This is the last release of OpenMC that will support Python 2.7. Future releases of OpenMC will require Python 3.4 or later.

• Rotationally-periodic boundary conditions
• C API (with Python bindings) for in-memory coupling
• Improved correlation for Uranium enrichment
• Support for partial S(a,b) tables
• Improved handling of autogenerated IDs
• Many performance/memory improvements

• 93746953ccd8d422b096dbef3c21d359e7424f0e Fix energy group sampling for multi-group simulations
• a149ef42a0b895d4014d43c82f680c55f6ae0db6 Ensure mutable objects are not hashable
• 2c9b210440b9b69b3b3009e2ae9f782b6eb7df26 Preserve backwards compatibility for generated HDF5 libraries
• 8047f6c1343451d6a466d77555bdff0bb228b422 Handle units of division for tally arithmetic correctly
• 0beb4cb937b453696db933f69ec9400d5e579515 Compatibility with newer versions of Pandas
• f124becba69ba60a9e2b70ad855b3b2d16e6902e Fix generating 0K data with openmc.data.njoy module
• 0c69153628c9aaf6a0370acbe9db4fbbbac2e07b Bugfix for generating thermal scattering data
• 61ecb4757e3b162ef4aba3e7c12ddc84ace0a9ea Fix bugs in Python multipole objects

This release contains new contributions from the following people:

• @brbass
• @wbinventor
• @GiudGiud
• @graybri3
• @smharper
• @cjosey
• @tjlaboss
• @liangjg
• @lindsayad
• @johnnyliu27
• @amandalund
• @aprilnovak
• @nelsonag
• @salcedop
• @paulromano
• @samuelshaner