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Leaky and Albedo Boundary Conditions Implementation (#2724)

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Co-authored-by: Paul Romano <paul.k.romano@gmail.com>
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Yuvraj Jain 2023-10-30 20:51:31 +00:00 • committed by GitHub
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8
docs/source/io_formats/summary.rst
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@ -60,9 +60,11 @@ The current version of the summary file format is 6.0.
- **coefficients** (*double[]*) -- Array of coefficients that define
the surface. See :ref:`surface_element` for what coefficients are
defined for each surface type.
- **boundary_condition** (*char[]*) -- Boundary condition applied to
the surface. Can be 'transmission', 'vacuum', 'reflective', or
'periodic'.
- **boundary_type** (*char[]*) -- Boundary condition applied to
the surface. Can be 'transmission', 'vacuum', 'reflective',
'periodic', or 'white'.
- **albedo** (*double*) -- Boundary albedo as a positive multiplier
of particle weight. If absent, it is assumed to be 1.0.
- **geom_type** (*char[]*) -- Type of geometry used to create the cell.
Either 'csg' or 'dagmc'.

32
docs/source/usersguide/geometry.rst
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@ -172,13 +172,17 @@ surface. To specify a vacuum boundary condition, simply change the
outer_surface = openmc.Sphere(r=100.0)
outer_surface.boundary_type = 'vacuum'
Reflective and periodic boundary conditions can be set with the strings
'reflective' and 'periodic'. Vacuum and reflective boundary conditions can be
applied to any type of surface. Periodic boundary conditions can be applied to
pairs of planar surfaces. If there are only two periodic surfaces they will be
matched automatically. Otherwise it is necessary to specify pairs explicitly
using the :attr:`Surface.periodic_surface` attribute as in the following
example::
Reflective, periodic, and white boundary conditions can be set with the
strings 'reflective', 'periodic', and 'white' respectively.
Vacuum, reflective and white boundary conditions can be applied to any
type of surface. The 'white' boundary condition supports diffuse particle
reflection in contrast to specular reflection provided by the 'reflective'
boundary condition.
Periodic boundary conditions can be applied to pairs of planar surfaces.
If there are only two periodic surfaces they will be matched automatically.
Otherwise it is necessary to specify pairs explicitly using the
:attr:`Surface.periodic_surface` attribute as in the following example::
p1 = openmc.Plane(a=0.3, b=5.0, d=1.0, boundary_type='periodic')
p2 = openmc.Plane(a=0.3, b=5.0, d=-1.0, boundary_type='periodic')
@ -196,6 +200,20 @@ lies in the first quadrant of the Cartesian grid. If the geometry instead lies
in the fourth quadrant, the :class:`YPlane` must be replaced by a
:class:`Plane` with the normal vector pointing in the :math:`-y` direction.
Additionally, 'reflective', 'periodic', and 'white' boundary conditions have
an albedo parameter that can be used to modify the importance of particles
that encounter the boundary. The albedo value specifies the ratio between
the particle's importance after interaction with the boundary to its initial
importance. The following example creates a reflective planar surface which
reduces the reflected particles' importance by 33.3%::
x1 = openmc.XPlane(1.0, boundary_type='reflective', albedo=0.667)
# This is equivalent
x1 = openmc.XPlane(1.0)
x1.boundary_type = 'reflective'
x1.albedo = 0.667
.. _usersguide_cells:
-----