crp/OpenMC
1
0
Fork 0
mirror of https://github.com/openmc-dev/openmc.git synced 2026-07-29 06:35:48 -04:00
Code Issues Projects Releases Packages Wiki Activity Actions 5

DAGMC Cell Override Updates (#3888)

Browse source 
Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>
Co-authored-by: Paul Romano <paul.k.romano@gmail.com>
This commit is contained in:
Patrick Shriwise 2026-05-20 16:43:21 -05:00 • committed by GitHub
parent 66497e76b1
commit 7d09a12606
No known key found for this signature in database
GPG key ID: B5690EEEBB952194
9 changed files with 689 additions and 264 deletions
Download patch file Download diff file Expand all files Collapse all files

61
docs/source/io_formats/geometry.rst
View file

@ -406,24 +406,55 @@ Each ``<dagmc_universe>`` element can have the following attributes or sub-eleme
*Default*: None
:material_overrides:
This element contains information on material overrides to be applied to the
DAGMC universe. It has the following attributes and sub-elements:
:cell:
Zero or more ``<cell>`` sub-elements may appear to override properties of
individual DAGMC volumes. Each ``<cell>`` element supports the following
attributes and sub-elements:
:cell:
Material override information for a single cell. It contains the following
attributes and sub-elements:
:id:
The integer cell ID in the DAGMC geometry to override. Required.
:id:
The cell ID in the DAGMC geometry for which the material override will
apply.
:name:
An optional string label for the cell.
:materials:
A list of material IDs that will apply to instances of the cell. If the
list contains only one ID, it will replace the original material
assignment of all instances of the DAGMC cell. If the list contains more
than one material, each material ID of the list will be assigned to the
various instances of the DAGMC cell.
*Default*: None
:material:
The material ID to assign to this cell. Use ``void`` for vacuum. Multiple
space-separated IDs may be given to specify a distribmat (distributed
material) assignment. Required.
:temperature:
Temperature(s) in [K] to assign to the cell. Must be ≥ 0. Multiple
space-separated values may be given.
*Default*: None
:density:
Density in [g/cm³] to assign to the cell. Must be > 0. Requires a non-void
material fill. Multiple space-separated values may be given.
*Default*: None
:volume:
Volume of the cell in [cm³].
.. note:: DAGMC can compute cell volumes exactly from the triangulated
mesh surfaces. Specifying a manual volume risks inconsistency
with that capability.
*Default*: None
The following standard ``<cell>`` attributes are **not** supported inside
``<dagmc_universe>`` and will raise an error if present: ``region``,
``fill``, ``universe``, ``translation``, ``rotation``.
.. deprecated::
The ``<material_overrides>`` sub-element (containing ``<cell_override>``
children with ``<material_ids>``) is deprecated. A deprecation warning is
emitted and the overrides are converted to the ``<cell>`` format at parse
time. It is an error to specify both ``<material_overrides>`` and
``<cell>`` sub-elements on the same ``<dagmc_universe>``.
*Default*: None