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Co-authored-by: John Tramm <jtramm@gmail.com> Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com> Co-authored-by: Paul Romano <paul.k.romano@gmail.com>
53 lines
1.8 KiB
Python
53 lines
1.8 KiB
Python
"""Test that convert_to_multigroup works with DAGMC models without requiring
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particles/batches to be set beforehand.
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"""
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from pathlib import Path
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import pytest
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import openmc
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import openmc.lib
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pytestmark = pytest.mark.skipif(
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not openmc.lib._dagmc_enabled(),
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reason="DAGMC CAD geometry is not enabled.")
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def test_convert_to_multigroup_without_particles_batches(run_in_tmpdir):
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"""Test that convert_to_multigroup works with DAGMC model without
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setting particles/batches beforehand."""
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openmc.reset_auto_ids()
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mat = openmc.Material(name="mat")
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mat.add_nuclide("Fe56", 1.0)
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mat.set_density("g/cm3", 7.0)
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# Use minimal tetrahedral DAGMC file
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dagmc_file = Path(__file__).parent / "dagmc_tetrahedral_no_graveyard.h5m"
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dagmc_univ = openmc.DAGMCUniverse(dagmc_file, auto_geom_ids=True)
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bound_dagmc_univ = dagmc_univ.bounded_universe(padding_distance=1)
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# Create model WITHOUT setting particles or batches
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model = openmc.Model()
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model.materials = openmc.Materials([mat])
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model.geometry = openmc.Geometry(bound_dagmc_univ)
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model.settings = openmc.Settings() # Note: no particles or batches set!
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model.settings.run_mode = 'fixed source'
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# Create a point source
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my_source = openmc.IndependentSource()
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my_source.space = openmc.stats.Point((0.25, 0.25, 0.25))
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my_source.energy = openmc.stats.delta_function(14e6)
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model.settings.source = my_source
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# This should work without requiring particles/batches to be set
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# convert_to_multigroup handles initialization internally using non-transport mode
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model.convert_to_multigroup(
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method='material_wise',
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groups='CASMO-2',
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particles=10,
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overwrite_mgxs_library=True
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)
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# Verify the model was converted successfully
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assert model.settings.energy_mode == 'multi-group'
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