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Co-authored-by: church89 <l.chierici89@gmail.com>
Co-authored-by: Paul Romano <paul.k.romano@gmail.com>
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Erik B Knudsen 2024-05-15 22:49:04 +02:00 • committed by GitHub
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48
docs/source/usersguide/settings.rst
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@ -420,6 +420,54 @@ string, which gets passed down to the ``openmc_create_source()`` function::
settings.source = openmc.CompiledSource('libsource.so', '3.5e6')
.. _usersguide_source_constraints:
Source Constraints
------------------
All source classes in OpenMC have the ability to apply a set of "constraints"
that limit which sampled source sites are actually used for transport. The most
common use case is to sample source sites over some simple spatial distribution
(e.g., uniform over a box) and then only accept those that appear in a given
cell or material. This can be done with a domain constraint, which can be
specified as follows::
source_cell = openmc.Cell(...)
...
spatial_dist = openmc.stats.Box((-10., -10., -10.), (10., 10., 10.))
source = openmc.IndependentSource(
space=spatial_dist,
constraints={'domains': [source_cell]}
)
For k-eigenvalue problems, a convenient constraint is available that limits
source sites to those sampled in a fissionable material::
source = openmc.IndependentSource(
space=spatial_dist, constraints={'fissionable': True}
)
Constraints can also be placed on a range of energies or times::
# Only use source sites between 500 keV and 1 MeV and with times under 1 sec
source = openmc.FileSource(
'source.h5',
constraints={'energy_bounds': [500.0e3, 1.0e6], 'time_bounds': [0.0, 1.0]}
)
Normally, when a source site is rejected, a new one will be resampled until one
is found that meets the constraints. However, the rejection strategy can be
changed so that a rejected site will just not be simulated by specifying::
source = openmc.IndependentSource(
space=spatial_dist,
constraints={'domains': [cell], 'rejection_strategy': 'kill'}
)
In this case, the actual number of particles simulated may be less than what you
specified in :attr:`Settings.particles`.
.. _usersguide_entropy:
---------------