from abc import ABCMeta
from collections import Iterable, OrderedDict
from copy import deepcopy
from numbers import Real, Integral
from xml.etree import ElementTree as ET
from math import sqrt
from six import add_metaclass, string_types
import numpy as np
from openmc.checkvalue import check_type, check_value, check_greater_than
from openmc.region import Region, Intersection, Union
# A static variable for auto-generated Surface IDs
AUTO_SURFACE_ID = 10000
_BOUNDARY_TYPES = ['transmission', 'vacuum', 'reflective', 'periodic']
def reset_auto_surface_id():
"""Reset counters for all auto-generated surface IDs"""
global AUTO_SURFACE_ID
AUTO_SURFACE_ID = 10000
[docs]class Surface(object):
"""An implicit surface with an associated boundary condition.
An implicit surface is defined as the set of zeros of a function of the
three Cartesian coordinates. Surfaces in OpenMC are limited to a set of
algebraic surfaces, i.e., surfaces that are polynomial in x, y, and z.
Parameters
----------
surface_id : int, optional
Unique identifier for the surface. If not specified, an identifier will
automatically be assigned.
boundary_type : {'transmission, 'vacuum', 'reflective', 'periodic'}, optional
Boundary condition that defines the behavior for particles hitting the
surface. Defaults to transmissive boundary condition where particles
freely pass through the surface. Note that periodic boundary conditions
can only be applied to x-, y-, and z-planes, and only axis-aligned
periodicity is supported.
name : str, optional
Name of the surface. If not specified, the name will be the empty
string.
Attributes
----------
boundary_type : {'transmission, 'vacuum', 'reflective', 'periodic'}
Boundary condition that defines the behavior for particles hitting the
surface.
coefficients : dict
Dictionary of surface coefficients
id : int
Unique identifier for the surface
name : str
Name of the surface
type : str
Type of the surface
"""
def __init__(self, surface_id=None, boundary_type='transmission', name=''):
self.id = surface_id
self.name = name
self._type = ''
self.boundary_type = boundary_type
# A dictionary of the quadratic surface coefficients
# Key - coefficeint name
# Value - coefficient value
self._coefficients = {}
# An ordered list of the coefficient names to export to XML in the
# proper order
self._coeff_keys = []
def __neg__(self):
return Halfspace(self, '-')
def __pos__(self):
return Halfspace(self, '+')
def __hash__(self):
return hash(repr(self))
def __repr__(self):
string = 'Surface\n'
string += '{0: <16}{1}{2}\n'.format('\tID', '=\t', self._id)
string += '{0: <16}{1}{2}\n'.format('\tName', '=\t', self._name)
string += '{0: <16}{1}{2}\n'.format('\tType', '=\t', self._type)
string += '{0: <16}{1}{2}\n'.format('\tBoundary', '=\t', self._boundary_type)
coefficients = '{0: <16}'.format('\tCoefficients') + '\n'
for coeff in self._coefficients:
coefficients += '{0: <16}{1}{2}\n'.format(
coeff, '=\t', self._coefficients[coeff])
string += coefficients
return string
@property
def id(self):
return self._id
@property
def name(self):
return self._name
@property
def type(self):
return self._type
@property
def boundary_type(self):
return self._boundary_type
@property
def coefficients(self):
return self._coefficients
@id.setter
def id(self, surface_id):
if surface_id is None:
global AUTO_SURFACE_ID
self._id = AUTO_SURFACE_ID
AUTO_SURFACE_ID += 1
else:
check_type('surface ID', surface_id, Integral)
check_greater_than('surface ID', surface_id, 0, equality=True)
self._id = surface_id
@name.setter
def name(self, name):
if name is not None:
check_type('surface name', name, string_types)
self._name = name
else:
self._name = ''
@boundary_type.setter
def boundary_type(self, boundary_type):
check_type('boundary type', boundary_type, string_types)
check_value('boundary type', boundary_type, _BOUNDARY_TYPES)
self._boundary_type = boundary_type
[docs] def bounding_box(self, side):
"""Determine an axis-aligned bounding box.
An axis-aligned bounding box for surface half-spaces is represented by
its lower-left and upper-right coordinates. If the half-space is
unbounded in a particular direction, numpy.inf is used to represent
infinity.
Parameters
----------
side : {'+', '-'}
Indicates the negative or positive half-space
Returns
-------
numpy.ndarray
Lower-left coordinates of the axis-aligned bounding box for the
desired half-space
numpy.ndarray
Upper-right coordinates of the axis-aligned bounding box for the
desired half-space
"""
return (np.array([-np.inf, -np.inf, -np.inf]),
np.array([np.inf, np.inf, np.inf]))
[docs] def clone(self, memo=None):
"""Create a copy of this surface with a new unique ID.
Parameters
----------
memo : dict or None
A nested dictionary of previously cloned objects. This parameter
is used internally and should not be specified by the user.
Returns
-------
clone : openmc.Surface
The clone of this surface
"""
if memo is None:
memo = {}
# If no nemoize'd clone exists, instantiate one
if self not in memo:
clone = deepcopy(self)
clone.id = None
# Memoize the clone
memo[self] = clone
return memo[self]
[docs] def to_xml_element(self):
"""Return XML representation of the surface
Returns
-------
element : xml.etree.ElementTree.Element
XML element containing source data
"""
element = ET.Element("surface")
element.set("id", str(self._id))
if len(self._name) > 0:
element.set("name", str(self._name))
element.set("type", self._type)
if self.boundary_type != 'transmission':
element.set("boundary", self.boundary_type)
element.set("coeffs", ' '.join([str(self._coefficients.setdefault(key, 0.0))
for key in self._coeff_keys]))
return element
@staticmethod
[docs] def from_hdf5(group):
"""Create surface from HDF5 group
Parameters
----------
group : h5py.Group
Group in HDF5 file
Returns
-------
openmc.Surface
Instance of surface subclass
"""
surface_id = int(group.name.split('/')[-1].lstrip('surface '))
name = group['name'].value.decode() if 'name' in group else ''
surf_type = group['type'].value.decode()
bc = group['boundary_type'].value.decode()
coeffs = group['coefficients'][...]
# Create the Surface based on its type
if surf_type == 'x-plane':
x0 = coeffs[0]
surface = XPlane(surface_id, bc, x0, name)
elif surf_type == 'y-plane':
y0 = coeffs[0]
surface = YPlane(surface_id, bc, y0, name)
elif surf_type == 'z-plane':
z0 = coeffs[0]
surface = ZPlane(surface_id, bc, z0, name)
elif surf_type == 'plane':
A, B, C, D = coeffs
surface = Plane(surface_id, bc, A, B, C, D, name)
elif surf_type == 'x-cylinder':
y0, z0, R = coeffs
surface = XCylinder(surface_id, bc, y0, z0, R, name)
elif surf_type == 'y-cylinder':
x0, z0, R = coeffs
surface = YCylinder(surface_id, bc, x0, z0, R, name)
elif surf_type == 'z-cylinder':
x0, y0, R = coeffs
surface = ZCylinder(surface_id, bc, x0, y0, R, name)
elif surf_type == 'sphere':
x0, y0, z0, R = coeffs
surface = Sphere(surface_id, bc, x0, y0, z0, R, name)
elif surf_type in ['x-cone', 'y-cone', 'z-cone']:
x0, y0, z0, R2 = coeffs
if surf_type == 'x-cone':
surface = XCone(surface_id, bc, x0, y0, z0, R2, name)
elif surf_type == 'y-cone':
surface = YCone(surface_id, bc, x0, y0, z0, R2, name)
elif surf_type == 'z-cone':
surface = ZCone(surface_id, bc, x0, y0, z0, R2, name)
elif surf_type == 'quadric':
a, b, c, d, e, f, g, h, j, k = coeffs
surface = Quadric(surface_id, bc, a, b, c, d, e, f, g,
h, j, k, name)
return surface
[docs]class Plane(Surface):
"""An arbitrary plane of the form :math:`Ax + By + Cz = D`.
Parameters
----------
surface_id : int, optional
Unique identifier for the surface. If not specified, an identifier will
automatically be assigned.
boundary_type : {'transmission, 'vacuum', 'reflective'}, optional
Boundary condition that defines the behavior for particles hitting the
surface. Defaults to transmissive boundary condition where particles
freely pass through the surface.
A : float, optional
The 'A' parameter for the plane. Defaults to 1.
B : float, optional
The 'B' parameter for the plane. Defaults to 0.
C : float, optional
The 'C' parameter for the plane. Defaults to 0.
D : float, optional
The 'D' parameter for the plane. Defaults to 0.
name : str, optional
Name of the plane. If not specified, the name will be the empty string.
Attributes
----------
a : float
The 'A' parameter for the plane
b : float
The 'B' parameter for the plane
c : float
The 'C' parameter for the plane
d : float
The 'D' parameter for the plane
boundary_type : {'transmission, 'vacuum', 'reflective'}
Boundary condition that defines the behavior for particles hitting the
surface.
periodic_surface : openmc.Surface
If a periodic boundary condition is used, the surface with which this
one is periodic with
coefficients : dict
Dictionary of surface coefficients
id : int
Unique identifier for the surface
name : str
Name of the surface
type : str
Type of the surface
"""
def __init__(self, surface_id=None, boundary_type='transmission',
A=1., B=0., C=0., D=0., name=''):
super(Plane, self).__init__(surface_id, boundary_type, name=name)
self._type = 'plane'
self._coeff_keys = ['A', 'B', 'C', 'D']
self._periodic_surface = None
self.a = A
self.b = B
self.c = C
self.d = D
@property
def a(self):
return self.coefficients['A']
@property
def b(self):
return self.coefficients['B']
@property
def c(self):
return self.coefficients['C']
@property
def d(self):
return self.coefficients['D']
@property
def periodic_surface(self):
return self._periodic_surface
@a.setter
def a(self, A):
check_type('A coefficient', A, Real)
self._coefficients['A'] = A
@b.setter
def b(self, B):
check_type('B coefficient', B, Real)
self._coefficients['B'] = B
@c.setter
def c(self, C):
check_type('C coefficient', C, Real)
self._coefficients['C'] = C
@d.setter
def d(self, D):
check_type('D coefficient', D, Real)
self._coefficients['D'] = D
@periodic_surface.setter
def periodic_surface(self, periodic_surface):
check_type('periodic surface', periodic_surface, Plane)
self._periodic_surface = periodic_surface
periodic_surface._periodic_surface = self
[docs] def evaluate(self, point):
"""Evaluate the surface equation at a given point.
Parameters
----------
point : 3-tuple of float
The Cartesian coordinates, :math:`(x',y',z')`, at which the surface
equation should be evaluated.
Returns
-------
float
:math:`Ax' + By' + Cz' - d`
"""
x, y, z = point
return self.a*x + self.b*y + self.c*z - self.d
[docs] def to_xml_element(self):
"""Return XML representation of the surface
Returns
-------
element : xml.etree.ElementTree.Element
XML element containing source data
"""
element = super(Plane, self).to_xml_element()
# Add periodic surface pair information
if self.boundary_type == 'periodic':
if self.periodic_surface is not None:
element.set("periodic_surface_id", str(self.periodic_surface.id))
return element
[docs]class XPlane(Plane):
"""A plane perpendicular to the x axis of the form :math:`x - x_0 = 0`
Parameters
----------
surface_id : int, optional
Unique identifier for the surface. If not specified, an identifier will
automatically be assigned.
boundary_type : {'transmission, 'vacuum', 'reflective', 'periodic'}, optional
Boundary condition that defines the behavior for particles hitting the
surface. Defaults to transmissive boundary condition where particles
freely pass through the surface. Only axis-aligned periodicity is
supported, i.e., x-planes can only be paired with x-planes.
x0 : float, optional
Location of the plane. Defaults to 0.
name : str, optional
Name of the plane. If not specified, the name will be the empty string.
Attributes
----------
x0 : float
Location of the plane
boundary_type : {'transmission, 'vacuum', 'reflective', 'periodic'}
Boundary condition that defines the behavior for particles hitting the
surface.
periodic_surface : openmc.Surface
If a periodic boundary condition is used, the surface with which this
one is periodic with
coefficients : dict
Dictionary of surface coefficients
id : int
Unique identifier for the surface
name : str
Name of the surface
type : str
Type of the surface
"""
def __init__(self, surface_id=None, boundary_type='transmission',
x0=0., name=''):
super(XPlane, self).__init__(surface_id, boundary_type, name=name)
self._type = 'x-plane'
self._coeff_keys = ['x0']
self.x0 = x0
@property
def x0(self):
return self.coefficients['x0']
@x0.setter
def x0(self, x0):
check_type('x0 coefficient', x0, Real)
self._coefficients['x0'] = x0
[docs] def bounding_box(self, side):
"""Determine an axis-aligned bounding box.
An axis-aligned bounding box for surface half-spaces is represented by
its lower-left and upper-right coordinates. For the x-plane surface, the
half-spaces are unbounded in their y- and z- directions. To represent
infinity, numpy.inf is used.
Parameters
----------
side : {'+', '-'}
Indicates the negative or positive half-space
Returns
-------
numpy.ndarray
Lower-left coordinates of the axis-aligned bounding box for the
desired half-space
numpy.ndarray
Upper-right coordinates of the axis-aligned bounding box for the
desired half-space
"""
if side == '-':
return (np.array([-np.inf, -np.inf, -np.inf]),
np.array([self.x0, np.inf, np.inf]))
elif side == '+':
return (np.array([self.x0, -np.inf, -np.inf]),
np.array([np.inf, np.inf, np.inf]))
[docs] def evaluate(self, point):
"""Evaluate the surface equation at a given point.
Parameters
----------
point : 3-tuple of float
The Cartesian coordinates, :math:`(x',y',z')`, at which the surface
equation should be evaluated.
Returns
-------
float
:math:`x' - x_0`
"""
return point[0] - self.x0
[docs]class YPlane(Plane):
"""A plane perpendicular to the y axis of the form :math:`y - y_0 = 0`
Parameters
----------
surface_id : int, optional
Unique identifier for the surface. If not specified, an identifier will
automatically be assigned.
boundary_type : {'transmission, 'vacuum', 'reflective', 'periodic'}, optional
Boundary condition that defines the behavior for particles hitting the
surface. Defaults to transmissive boundary condition where particles
freely pass through the surface. Only axis-aligned periodicity is
supported, i.e., x-planes can only be paired with x-planes.
y0 : float, optional
Location of the plane
name : str, optional
Name of the plane. If not specified, the name will be the empty string.
Attributes
----------
y0 : float
Location of the plane
boundary_type : {'transmission, 'vacuum', 'reflective', 'periodic'}
Boundary condition that defines the behavior for particles hitting the
surface.
periodic_surface : openmc.Surface
If a periodic boundary condition is used, the surface with which this
one is periodic with
coefficients : dict
Dictionary of surface coefficients
id : int
Unique identifier for the surface
name : str
Name of the surface
type : str
Type of the surface
"""
def __init__(self, surface_id=None, boundary_type='transmission',
y0=0., name=''):
# Initialize YPlane class attributes
super(YPlane, self).__init__(surface_id, boundary_type, name=name)
self._type = 'y-plane'
self._coeff_keys = ['y0']
self.y0 = y0
@property
def y0(self):
return self.coefficients['y0']
@y0.setter
def y0(self, y0):
check_type('y0 coefficient', y0, Real)
self._coefficients['y0'] = y0
[docs] def bounding_box(self, side):
"""Determine an axis-aligned bounding box.
An axis-aligned bounding box for surface half-spaces is represented by
its lower-left and upper-right coordinates. For the y-plane surface, the
half-spaces are unbounded in their x- and z- directions. To represent
infinity, numpy.inf is used.
Parameters
----------
side : {'+', '-'}
Indicates the negative or positive half-space
Returns
-------
numpy.ndarray
Lower-left coordinates of the axis-aligned bounding box for the
desired half-space
numpy.ndarray
Upper-right coordinates of the axis-aligned bounding box for the
desired half-space
"""
if side == '-':
return (np.array([-np.inf, -np.inf, -np.inf]),
np.array([np.inf, self.y0, np.inf]))
elif side == '+':
return (np.array([-np.inf, self.y0, -np.inf]),
np.array([np.inf, np.inf, np.inf]))
[docs] def evaluate(self, point):
"""Evaluate the surface equation at a given point.
Parameters
----------
point : 3-tuple of float
The Cartesian coordinates, :math:`(x',y',z')`, at which the surface
equation should be evaluated.
Returns
-------
float
:math:`y' - y_0`
"""
return point[1] - self.y0
[docs]class ZPlane(Plane):
"""A plane perpendicular to the z axis of the form :math:`z - z_0 = 0`
Parameters
----------
surface_id : int, optional
Unique identifier for the surface. If not specified, an identifier will
automatically be assigned.
boundary_type : {'transmission, 'vacuum', 'reflective', 'periodic'}, optional
Boundary condition that defines the behavior for particles hitting the
surface. Defaults to transmissive boundary condition where particles
freely pass through the surface. Only axis-aligned periodicity is
supported, i.e., x-planes can only be paired with x-planes.
z0 : float, optional
Location of the plane. Defaults to 0.
name : str, optional
Name of the plane. If not specified, the name will be the empty string.
Attributes
----------
z0 : float
Location of the plane
boundary_type : {'transmission, 'vacuum', 'reflective', 'periodic'}
Boundary condition that defines the behavior for particles hitting the
surface.
periodic_surface : openmc.Surface
If a periodic boundary condition is used, the surface with which this
one is periodic with
coefficients : dict
Dictionary of surface coefficients
id : int
Unique identifier for the surface
name : str
Name of the surface
type : str
Type of the surface
"""
def __init__(self, surface_id=None, boundary_type='transmission',
z0=0., name=''):
# Initialize ZPlane class attributes
super(ZPlane, self).__init__(surface_id, boundary_type, name=name)
self._type = 'z-plane'
self._coeff_keys = ['z0']
self.z0 = z0
@property
def z0(self):
return self.coefficients['z0']
@z0.setter
def z0(self, z0):
check_type('z0 coefficient', z0, Real)
self._coefficients['z0'] = z0
[docs] def bounding_box(self, side):
"""Determine an axis-aligned bounding box.
An axis-aligned bounding box for surface half-spaces is represented by
its lower-left and upper-right coordinates. For the z-plane surface, the
half-spaces are unbounded in their x- and y- directions. To represent
infinity, numpy.inf is used.
Parameters
----------
side : {'+', '-'}
Indicates the negative or positive half-space
Returns
-------
numpy.ndarray
Lower-left coordinates of the axis-aligned bounding box for the
desired half-space
numpy.ndarray
Upper-right coordinates of the axis-aligned bounding box for the
desired half-space
"""
if side == '-':
return (np.array([-np.inf, -np.inf, -np.inf]),
np.array([np.inf, np.inf, self.z0]))
elif side == '+':
return (np.array([-np.inf, -np.inf, self.z0]),
np.array([np.inf, np.inf, np.inf]))
[docs] def evaluate(self, point):
"""Evaluate the surface equation at a given point.
Parameters
----------
point : 3-tuple of float
The Cartesian coordinates, :math:`(x',y',z')`, at which the surface
equation should be evaluated.
Returns
-------
float
:math:`z' - z_0`
"""
return point[2] - self.z0
@add_metaclass(ABCMeta)
class Cylinder(Surface):
"""A cylinder whose length is parallel to the x-, y-, or z-axis.
Parameters
----------
surface_id : int, optional
Unique identifier for the surface. If not specified, an identifier will
automatically be assigned.
boundary_type : {'transmission, 'vacuum', 'reflective'}, optional
Boundary condition that defines the behavior for particles hitting the
surface. Defaults to transmissive boundary condition where particles
freely pass through the surface.
R : float, optional
Radius of the cylinder. Defaults to 1.
name : str, optional
Name of the cylinder. If not specified, the name will be the empty
string.
Attributes
----------
r : float
Radius of the cylinder
boundary_type : {'transmission, 'vacuum', 'reflective'}
Boundary condition that defines the behavior for particles hitting the
surface.
coefficients : dict
Dictionary of surface coefficients
id : int
Unique identifier for the surface
name : str
Name of the surface
type : str
Type of the surface
"""
def __init__(self, surface_id=None, boundary_type='transmission',
R=1., name=''):
super(Cylinder, self).__init__(surface_id, boundary_type, name=name)
self._coeff_keys = ['R']
self.r = R
@property
def r(self):
return self.coefficients['R']
@r.setter
def r(self, R):
check_type('R coefficient', R, Real)
self._coefficients['R'] = R
[docs]class XCylinder(Cylinder):
"""An infinite cylinder whose length is parallel to the x-axis of the form
:math:`(y - y_0)^2 + (z - z_0)^2 = R^2`.
Parameters
----------
surface_id : int, optional
Unique identifier for the surface. If not specified, an identifier will
automatically be assigned.
boundary_type : {'transmission, 'vacuum', 'reflective'}, optional
Boundary condition that defines the behavior for particles hitting the
surface. Defaults to transmissive boundary condition where particles
freely pass through the surface.
y0 : float, optional
y-coordinate of the center of the cylinder. Defaults to 0.
z0 : float, optional
z-coordinate of the center of the cylinder. Defaults to 0.
R : float, optional
Radius of the cylinder. Defaults to 0.
name : str, optional
Name of the cylinder. If not specified, the name will be the empty
string.
Attributes
----------
y0 : float
y-coordinate of the center of the cylinder
z0 : float
z-coordinate of the center of the cylinder
boundary_type : {'transmission, 'vacuum', 'reflective'}
Boundary condition that defines the behavior for particles hitting the
surface.
coefficients : dict
Dictionary of surface coefficients
id : int
Unique identifier for the surface
name : str
Name of the surface
type : str
Type of the surface
"""
def __init__(self, surface_id=None, boundary_type='transmission',
y0=0., z0=0., R=1., name=''):
super(XCylinder, self).__init__(surface_id, boundary_type, R, name=name)
self._type = 'x-cylinder'
self._coeff_keys = ['y0', 'z0', 'R']
self.y0 = y0
self.z0 = z0
@property
def y0(self):
return self.coefficients['y0']
@property
def z0(self):
return self.coefficients['z0']
@y0.setter
def y0(self, y0):
check_type('y0 coefficient', y0, Real)
self._coefficients['y0'] = y0
@z0.setter
def z0(self, z0):
check_type('z0 coefficient', z0, Real)
self._coefficients['z0'] = z0
[docs] def bounding_box(self, side):
"""Determine an axis-aligned bounding box.
An axis-aligned bounding box for surface half-spaces is represented by
its lower-left and upper-right coordinates. For the x-cylinder surface,
the negative half-space is unbounded in the x- direction and the
positive half-space is unbounded in all directions. To represent
infinity, numpy.inf is used.
Parameters
----------
side : {'+', '-'}
Indicates the negative or positive half-space
Returns
-------
numpy.ndarray
Lower-left coordinates of the axis-aligned bounding box for the
desired half-space
numpy.ndarray
Upper-right coordinates of the axis-aligned bounding box for the
desired half-space
"""
if side == '-':
return (np.array([-np.inf, self.y0 - self.r, self.z0 - self.r]),
np.array([np.inf, self.y0 + self.r, self.z0 + self.r]))
elif side == '+':
return (np.array([-np.inf, -np.inf, -np.inf]),
np.array([np.inf, np.inf, np.inf]))
[docs] def evaluate(self, point):
"""Evaluate the surface equation at a given point.
Parameters
----------
point : 3-tuple of float
The Cartesian coordinates, :math:`(x',y',z')`, at which the surface
equation should be evaluated.
Returns
-------
float
:math:`(y' - y_0)^2 + (z' - z_0)^2 - R^2`
"""
y = point[1] - self.y0
z = point[2] - self.z0
return y**2 + z**2 - self.r**2
[docs]class YCylinder(Cylinder):
"""An infinite cylinder whose length is parallel to the y-axis of the form
:math:`(x - x_0)^2 + (z - z_0)^2 = R^2`.
Parameters
----------
surface_id : int, optional
Unique identifier for the surface. If not specified, an identifier will
automatically be assigned.
boundary_type : {'transmission, 'vacuum', 'reflective'}, optional
Boundary condition that defines the behavior for particles hitting the
surface. Defaults to transmissive boundary condition where particles
freely pass through the surface.
x0 : float, optional
x-coordinate of the center of the cylinder. Defaults to 0.
z0 : float, optional
z-coordinate of the center of the cylinder. Defaults to 0.
R : float, optional
Radius of the cylinder. Defaults to 1.
name : str, optional
Name of the cylinder. If not specified, the name will be the empty
string.
Attributes
----------
x0 : float
x-coordinate of the center of the cylinder
z0 : float
z-coordinate of the center of the cylinder
boundary_type : {'transmission, 'vacuum', 'reflective'}
Boundary condition that defines the behavior for particles hitting the
surface.
coefficients : dict
Dictionary of surface coefficients
id : int
Unique identifier for the surface
name : str
Name of the surface
type : str
Type of the surface
"""
def __init__(self, surface_id=None, boundary_type='transmission',
x0=0., z0=0., R=1., name=''):
super(YCylinder, self).__init__(surface_id, boundary_type, R, name=name)
self._type = 'y-cylinder'
self._coeff_keys = ['x0', 'z0', 'R']
self.x0 = x0
self.z0 = z0
@property
def x0(self):
return self.coefficients['x0']
@property
def z0(self):
return self.coefficients['z0']
@x0.setter
def x0(self, x0):
check_type('x0 coefficient', x0, Real)
self._coefficients['x0'] = x0
@z0.setter
def z0(self, z0):
check_type('z0 coefficient', z0, Real)
self._coefficients['z0'] = z0
[docs] def bounding_box(self, side):
"""Determine an axis-aligned bounding box.
An axis-aligned bounding box for surface half-spaces is represented by
its lower-left and upper-right coordinates. For the y-cylinder surface,
the negative half-space is unbounded in the y- direction and the
positive half-space is unbounded in all directions. To represent
infinity, numpy.inf is used.
Parameters
----------
side : {'+', '-'}
Indicates the negative or positive half-space
Returns
-------
numpy.ndarray
Lower-left coordinates of the axis-aligned bounding box for the
desired half-space
numpy.ndarray
Upper-right coordinates of the axis-aligned bounding box for the
desired half-space
"""
if side == '-':
return (np.array([self.x0 - self.r, -np.inf, self.z0 - self.r]),
np.array([self.x0 + self.r, np.inf, self.z0 + self.r]))
elif side == '+':
return (np.array([-np.inf, -np.inf, -np.inf]),
np.array([np.inf, np.inf, np.inf]))
[docs] def evaluate(self, point):
"""Evaluate the surface equation at a given point.
Parameters
----------
point : 3-tuple of float
The Cartesian coordinates, :math:`(x',y',z')`, at which the surface
equation should be evaluated.
Returns
-------
float
:math:`(x' - x_0)^2 + (z' - z_0)^2 - R^2`
"""
x = point[0] - self.x0
z = point[2] - self.z0
return x**2 + z**2 - self.r**2
[docs]class ZCylinder(Cylinder):
"""An infinite cylinder whose length is parallel to the z-axis of the form
:math:`(x - x_0)^2 + (y - y_0)^2 = R^2`.
Parameters
----------
surface_id : int, optional
Unique identifier for the surface. If not specified, an identifier will
automatically be assigned.
boundary_type : {'transmission, 'vacuum', 'reflective'}, optional
Boundary condition that defines the behavior for particles hitting the
surface. Defaults to transmissive boundary condition where particles
freely pass through the surface.
x0 : float, optional
x-coordinate of the center of the cylinder. Defaults to 0.
y0 : float, optional
y-coordinate of the center of the cylinder. Defaults to 0.
R : float, optional
Radius of the cylinder. Defaults to 1.
name : str, optional
Name of the cylinder. If not specified, the name will be the empty
string.
Attributes
----------
x0 : float
x-coordinate of the center of the cylinder
y0 : float
y-coordinate of the center of the cylinder
boundary_type : {'transmission, 'vacuum', 'reflective'}
Boundary condition that defines the behavior for particles hitting the
surface.
coefficients : dict
Dictionary of surface coefficients
id : int
Unique identifier for the surface
name : str
Name of the surface
type : str
Type of the surface
"""
def __init__(self, surface_id=None, boundary_type='transmission',
x0=0., y0=0., R=1., name=''):
super(ZCylinder, self).__init__(surface_id, boundary_type, R, name=name)
self._type = 'z-cylinder'
self._coeff_keys = ['x0', 'y0', 'R']
self.x0 = x0
self.y0 = y0
@property
def x0(self):
return self.coefficients['x0']
@property
def y0(self):
return self.coefficients['y0']
@x0.setter
def x0(self, x0):
check_type('x0 coefficient', x0, Real)
self._coefficients['x0'] = x0
@y0.setter
def y0(self, y0):
check_type('y0 coefficient', y0, Real)
self._coefficients['y0'] = y0
[docs] def bounding_box(self, side):
"""Determine an axis-aligned bounding box.
An axis-aligned bounding box for surface half-spaces is represented by
its lower-left and upper-right coordinates. For the z-cylinder surface,
the negative half-space is unbounded in the z- direction and the
positive half-space is unbounded in all directions. To represent
infinity, numpy.inf is used.
Parameters
----------
side : {'+', '-'}
Indicates the negative or positive half-space
Returns
-------
numpy.ndarray
Lower-left coordinates of the axis-aligned bounding box for the
desired half-space
numpy.ndarray
Upper-right coordinates of the axis-aligned bounding box for the
desired half-space
"""
if side == '-':
return (np.array([self.x0 - self.r, self.y0 - self.r, -np.inf]),
np.array([self.x0 + self.r, self.y0 + self.r, np.inf]))
elif side == '+':
return (np.array([-np.inf, -np.inf, -np.inf]),
np.array([np.inf, np.inf, np.inf]))
[docs] def evaluate(self, point):
"""Evaluate the surface equation at a given point.
Parameters
----------
point : 3-tuple of float
The Cartesian coordinates, :math:`(x',y',z')`, at which the surface
equation should be evaluated.
Returns
-------
float
:math:`(x' - x_0)^2 + (y' - y_0)^2 - R^2`
"""
x = point[0] - self.x0
y = point[1] - self.y0
return x**2 + y**2 - self.r**2
[docs]class Sphere(Surface):
"""A sphere of the form :math:`(x - x_0)^2 + (y - y_0)^2 + (z - z_0)^2 = R^2`.
Parameters
----------
surface_id : int, optional
Unique identifier for the surface. If not specified, an identifier will
automatically be assigned.
boundary_type : {'transmission, 'vacuum', 'reflective'}, optional
Boundary condition that defines the behavior for particles hitting the
surface. Defaults to transmissive boundary condition where particles
freely pass through the surface.
x0 : float, optional
x-coordinate of the center of the sphere. Defaults to 0.
y0 : float, optional
y-coordinate of the center of the sphere. Defaults to 0.
z0 : float, optional
z-coordinate of the center of the sphere. Defaults to 0.
R : float, optional
Radius of the sphere. Defaults to 1.
name : str, optional
Name of the sphere. If not specified, the name will be the empty string.
Attributes
----------
x0 : float
x-coordinate of the center of the sphere
y0 : float
y-coordinate of the center of the sphere
z0 : float
z-coordinate of the center of the sphere
r : float
Radius of the sphere
boundary_type : {'transmission, 'vacuum', 'reflective'}
Boundary condition that defines the behavior for particles hitting the
surface.
coefficients : dict
Dictionary of surface coefficients
id : int
Unique identifier for the surface
name : str
Name of the surface
type : str
Type of the surface
"""
def __init__(self, surface_id=None, boundary_type='transmission',
x0=0., y0=0., z0=0., R=1., name=''):
super(Sphere, self).__init__(surface_id, boundary_type, name=name)
self._type = 'sphere'
self._coeff_keys = ['x0', 'y0', 'z0', 'R']
self.x0 = x0
self.y0 = y0
self.z0 = z0
self.r = R
@property
def x0(self):
return self.coefficients['x0']
@property
def y0(self):
return self.coefficients['y0']
@property
def z0(self):
return self.coefficients['z0']
@property
def r(self):
return self.coefficients['R']
@x0.setter
def x0(self, x0):
check_type('x0 coefficient', x0, Real)
self._coefficients['x0'] = x0
@y0.setter
def y0(self, y0):
check_type('y0 coefficient', y0, Real)
self._coefficients['y0'] = y0
@z0.setter
def z0(self, z0):
check_type('z0 coefficient', z0, Real)
self._coefficients['z0'] = z0
@r.setter
def r(self, R):
check_type('R coefficient', R, Real)
self._coefficients['R'] = R
[docs] def bounding_box(self, side):
"""Determine an axis-aligned bounding box.
An axis-aligned bounding box for surface half-spaces is represented by
its lower-left and upper-right coordinates. The positive half-space of a
sphere is unbounded in all directions. To represent infinity, numpy.inf
is used.
Parameters
----------
side : {'+', '-'}
Indicates the negative or positive half-space
Returns
-------
numpy.ndarray
Lower-left coordinates of the axis-aligned bounding box for the
desired half-space
numpy.ndarray
Upper-right coordinates of the axis-aligned bounding box for the
desired half-space
"""
if side == '-':
return (np.array([self.x0 - self.r, self.y0 - self.r,
self.z0 - self.r]),
np.array([self.x0 + self.r, self.y0 + self.r,
self.z0 + self.r]))
elif side == '+':
return (np.array([-np.inf, -np.inf, -np.inf]),
np.array([np.inf, np.inf, np.inf]))
[docs] def evaluate(self, point):
"""Evaluate the surface equation at a given point.
Parameters
----------
point : 3-tuple of float
The Cartesian coordinates, :math:`(x',y',z')`, at which the surface
equation should be evaluated.
Returns
-------
float
:math:`(x' - x_0)^2 + (y' - y_0)^2 + (z' - z_0)^2 - R^2`
"""
x = point[0] - self.x0
y = point[1] - self.y0
z = point[2] - self.z0
return x**2 + y**2 + z**2 - self.r**2
@add_metaclass(ABCMeta)
[docs]class Cone(Surface):
"""A conical surface parallel to the x-, y-, or z-axis.
Parameters
----------
surface_id : int, optional
Unique identifier for the surface. If not specified, an identifier will
automatically be assigned.
boundary_type : {'transmission, 'vacuum', 'reflective'}, optional
Boundary condition that defines the behavior for particles hitting the
surface. Defaults to transmissive boundary condition where particles
freely pass through the surface.
x0 : float, optional
x-coordinate of the apex. Defaults to 0.
y0 : float
y-coordinate of the apex. Defaults to 0.
z0 : float
z-coordinate of the apex. Defaults to 0.
R2 : float
Parameter related to the aperature. Defaults to 1.
name : str
Name of the cone. If not specified, the name will be the empty string.
Attributes
----------
x0 : float
x-coordinate of the apex
y0 : float
y-coordinate of the apex
z0 : float
z-coordinate of the apex
r2 : float
Parameter related to the aperature
boundary_type : {'transmission, 'vacuum', 'reflective'}
Boundary condition that defines the behavior for particles hitting the
surface.
coefficients : dict
Dictionary of surface coefficients
id : int
Unique identifier for the surface
name : str
Name of the surface
type : str
Type of the surface
"""
def __init__(self, surface_id=None, boundary_type='transmission',
x0=0., y0=0., z0=0., R2=1., name=''):
super(Cone, self).__init__(surface_id, boundary_type, name=name)
self._coeff_keys = ['x0', 'y0', 'z0', 'R2']
self.x0 = x0
self.y0 = y0
self.z0 = z0
self.r2 = R2
@property
def x0(self):
return self.coefficients['x0']
@property
def y0(self):
return self.coefficients['y0']
@property
def z0(self):
return self.coefficients['z0']
@property
def r2(self):
return self.coefficients['r2']
@x0.setter
def x0(self, x0):
check_type('x0 coefficient', x0, Real)
self._coefficients['x0'] = x0
@y0.setter
def y0(self, y0):
check_type('y0 coefficient', y0, Real)
self._coefficients['y0'] = y0
@z0.setter
def z0(self, z0):
check_type('z0 coefficient', z0, Real)
self._coefficients['z0'] = z0
@r2.setter
def r2(self, R2):
check_type('R^2 coefficient', R2, Real)
self._coefficients['R2'] = R2
[docs]class XCone(Cone):
"""A cone parallel to the x-axis of the form :math:`(y - y_0)^2 + (z - z_0)^2 =
R^2 (x - x_0)^2`.
Parameters
----------
surface_id : int, optional
Unique identifier for the surface. If not specified, an identifier will
automatically be assigned.
boundary_type : {'transmission, 'vacuum', 'reflective'}, optional
Boundary condition that defines the behavior for particles hitting the
surface. Defaults to transmissive boundary condition where particles
freely pass through the surface.
x0 : float, optional
x-coordinate of the apex. Defaults to 0.
y0 : float, optional
y-coordinate of the apex. Defaults to 0.
z0 : float, optional
z-coordinate of the apex. Defaults to 0.
R2 : float, optional
Parameter related to the aperature. Defaults to 1.
name : str, optional
Name of the cone. If not specified, the name will be the empty string.
Attributes
----------
x0 : float
x-coordinate of the apex
y0 : float
y-coordinate of the apex
z0 : float
z-coordinate of the apex
R2 : float
Parameter related to the aperature
boundary_type : {'transmission, 'vacuum', 'reflective'}
Boundary condition that defines the behavior for particles hitting the
surface.
coefficients : dict
Dictionary of surface coefficients
id : int
Unique identifier for the surface
name : str
Name of the surface
type : str
Type of the surface
"""
def __init__(self, surface_id=None, boundary_type='transmission',
x0=0., y0=0., z0=0., R2=1., name=''):
super(XCone, self).__init__(surface_id, boundary_type, x0, y0,
z0, R2, name=name)
self._type = 'x-cone'
[docs] def evaluate(self, point):
"""Evaluate the surface equation at a given point.
Parameters
----------
point : 3-tuple of float
The Cartesian coordinates, :math:`(x',y',z')`, at which the surface
equation should be evaluated.
Returns
-------
float
:math:`(y' - y_0)^2 + (z' - z_0)^2 - R^2(x' - x_0)^2`
"""
x = point[0] - self.x0
y = point[1] - self.y0
z = point[2] - self.z0
return y**2 + z**2 - self.r2*x**2
[docs]class YCone(Cone):
"""A cone parallel to the y-axis of the form :math:`(x - x_0)^2 + (z - z_0)^2 =
R^2 (y - y_0)^2`.
Parameters
----------
surface_id : int, optional
Unique identifier for the surface. If not specified, an identifier will
automatically be assigned.
boundary_type : {'transmission, 'vacuum', 'reflective'}, optional
Boundary condition that defines the behavior for particles hitting the
surface. Defaults to transmissive boundary condition where particles
freely pass through the surface.
x0 : float, optional
x-coordinate of the apex. Defaults to 0.
y0 : float, optional
y-coordinate of the apex. Defaults to 0.
z0 : float, optional
z-coordinate of the apex. Defaults to 0.
R2 : float, optional
Parameter related to the aperature. Defaults to 1.
name : str, optional
Name of the cone. If not specified, the name will be the empty string.
Attributes
----------
x0 : float
x-coordinate of the apex
y0 : float
y-coordinate of the apex
z0 : float
z-coordinate of the apex
R2 : float
Parameter related to the aperature
boundary_type : {'transmission, 'vacuum', 'reflective'}
Boundary condition that defines the behavior for particles hitting the
surface.
coefficients : dict
Dictionary of surface coefficients
id : int
Unique identifier for the surface
name : str
Name of the surface
type : str
Type of the surface
"""
def __init__(self, surface_id=None, boundary_type='transmission',
x0=0., y0=0., z0=0., R2=1., name=''):
super(YCone, self).__init__(surface_id, boundary_type, x0, y0, z0,
R2, name=name)
self._type = 'y-cone'
[docs] def evaluate(self, point):
"""Evaluate the surface equation at a given point.
Parameters
----------
point : 3-tuple of float
The Cartesian coordinates, :math:`(x',y',z')`, at which the surface
equation should be evaluated.
Returns
-------
float
:math:`(x' - x_0)^2 + (z' - z_0)^2 - R^2(y' - y_0)^2`
"""
x = point[0] - self.x0
y = point[1] - self.y0
z = point[2] - self.z0
return x**2 + z**2 - self.r2*y**2
[docs]class ZCone(Cone):
"""A cone parallel to the x-axis of the form :math:`(x - x_0)^2 + (y - y_0)^2 =
R^2 (z - z_0)^2`.
Parameters
----------
surface_id : int, optional
Unique identifier for the surface. If not specified, an identifier will
automatically be assigned.
boundary_type : {'transmission, 'vacuum', 'reflective'}, optional
Boundary condition that defines the behavior for particles hitting the
surface. Defaults to transmissive boundary condition where particles
freely pass through the surface.
x0 : float, optional
x-coordinate of the apex. Defaults to 0.
y0 : float, optional
y-coordinate of the apex. Defaults to 0.
z0 : float, optional
z-coordinate of the apex. Defaults to 0.
R2 : float, optional
Parameter related to the aperature. Defaults to 1.
name : str, optional
Name of the cone. If not specified, the name will be the empty string.
Attributes
----------
x0 : float
x-coordinate of the apex
y0 : float
y-coordinate of the apex
z0 : float
z-coordinate of the apex
R2 : float
Parameter related to the aperature
boundary_type : {'transmission, 'vacuum', 'reflective'}
Boundary condition that defines the behavior for particles hitting the
surface.
coefficients : dict
Dictionary of surface coefficients
id : int
Unique identifier for the surface
name : str
Name of the surface
type : str
Type of the surface
"""
def __init__(self, surface_id=None, boundary_type='transmission',
x0=0., y0=0., z0=0., R2=1., name=''):
super(ZCone, self).__init__(surface_id, boundary_type, x0, y0, z0,
R2, name=name)
self._type = 'z-cone'
[docs] def evaluate(self, point):
"""Evaluate the surface equation at a given point.
Parameters
----------
point : 3-tuple of float
The Cartesian coordinates, :math:`(x',y',z')`, at which the surface
equation should be evaluated.
Returns
-------
float
:math:`(x' - x_0)^2 + (y' - y_0)^2 - R^2(z' - z_0)^2`
"""
x = point[0] - self.x0
y = point[1] - self.y0
z = point[2] - self.z0
return x**2 + y**2 - self.r2*z**2
[docs]class Quadric(Surface):
"""A surface of the form :math:`Ax^2 + By^2 + Cz^2 + Dxy + Eyz + Fxz + Gx + Hy +
Jz + K = 0`.
Parameters
----------
surface_id : int, optional
Unique identifier for the surface. If not specified, an identifier will
automatically be assigned.
boundary_type : {'transmission, 'vacuum', 'reflective', 'periodic'}, optional
Boundary condition that defines the behavior for particles hitting the
surface. Defaults to transmissive boundary condition where particles
freely pass through the surface.
a, b, c, d, e, f, g, h, j, k : float, optional
coefficients for the surface. All default to 0.
name : str, optional
Name of the sphere. If not specified, the name will be the empty string.
Attributes
----------
a, b, c, d, e, f, g, h, j, k : float
coefficients for the surface
boundary_type : {'transmission, 'vacuum', 'reflective', 'periodic'}
Boundary condition that defines the behavior for particles hitting the
surface.
coefficients : dict
Dictionary of surface coefficients
id : int
Unique identifier for the surface
name : str
Name of the surface
type : str
Type of the surface
"""
def __init__(self, surface_id=None, boundary_type='transmission',
a=0., b=0., c=0., d=0., e=0., f=0., g=0.,
h=0., j=0., k=0., name=''):
super(Quadric, self).__init__(surface_id, boundary_type, name=name)
self._type = 'quadric'
self._coeff_keys = ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'j', 'k']
self.a = a
self.b = b
self.c = c
self.d = d
self.e = e
self.f = f
self.g = g
self.h = h
self.j = j
self.k = k
@property
def a(self):
return self.coefficients['a']
@property
def b(self):
return self.coefficients['b']
@property
def c(self):
return self.coefficients['c']
@property
def d(self):
return self.coefficients['d']
@property
def e(self):
return self.coefficients['e']
@property
def f(self):
return self.coefficients['f']
@property
def g(self):
return self.coefficients['g']
@property
def h(self):
return self.coefficients['h']
@property
def j(self):
return self.coefficients['j']
@property
def k(self):
return self.coefficients['k']
@a.setter
def a(self, a):
check_type('a coefficient', a, Real)
self._coefficients['a'] = a
@b.setter
def b(self, b):
check_type('b coefficient', b, Real)
self._coefficients['b'] = b
@c.setter
def c(self, c):
check_type('c coefficient', c, Real)
self._coefficients['c'] = c
@d.setter
def d(self, d):
check_type('d coefficient', d, Real)
self._coefficients['d'] = d
@e.setter
def e(self, e):
check_type('e coefficient', e, Real)
self._coefficients['e'] = e
@f.setter
def f(self, f):
check_type('f coefficient', f, Real)
self._coefficients['f'] = f
@g.setter
def g(self, g):
check_type('g coefficient', g, Real)
self._coefficients['g'] = g
@h.setter
def h(self, h):
check_type('h coefficient', h, Real)
self._coefficients['h'] = h
@j.setter
def j(self, j):
check_type('j coefficient', j, Real)
self._coefficients['j'] = j
@k.setter
def k(self, k):
check_type('k coefficient', k, Real)
self._coefficients['k'] = k
[docs] def evaluate(self, point):
"""Evaluate the surface equation at a given point.
Parameters
----------
point : 3-tuple of float
The Cartesian coordinates, :math:`(x',y',z')`, at which the surface
equation should be evaluated.
Returns
-------
float
:math:`Ax'^2 + By'^2 + Cz'^2 + Dx'y' + Ey'z' + Fx'z' + Gx' + Hy' +
Jz' + K = 0`
"""
x, y, z = point
return x*(self.a*x + self.d*y + self.g) + \
y*(self.b*y + self.e*z + self.h) + \
z*(self.c*z + self.f*x + self.j) + self.k
[docs]class Halfspace(Region):
"""A positive or negative half-space region.
A half-space is either of the two parts into which a two-dimension surface
divides the three-dimensional Euclidean space. If the equation of the
surface is :math:`f(x,y,z) = 0`, the region for which :math:`f(x,y,z) < 0`
is referred to as the negative half-space and the region for which
:math:`f(x,y,z) > 0` is referred to as the positive half-space.
Instances of Halfspace are generally not instantiated directly. Rather, they
can be created from an existing Surface through the __neg__ and __pos__
operators, as the following example demonstrates:
>>> sphere = openmc.Sphere(surface_id=1, R=10.0)
>>> inside_sphere = -sphere
>>> outside_sphere = +sphere
>>> type(inside_sphere)
<class 'openmc.surface.Halfspace'>
Parameters
----------
surface : openmc.Surface
Surface which divides Euclidean space.
side : {'+', '-'}
Indicates whether the positive or negative half-space is used.
Attributes
----------
surface : openmc.Surface
Surface which divides Euclidean space.
side : {'+', '-'}
Indicates whether the positive or negative half-space is used.
bounding_box : tuple of numpy.ndarray
Lower-left and upper-right coordinates of an axis-aligned bounding box
"""
def __init__(self, surface, side):
self.surface = surface
self.side = side
def __and__(self, other):
if isinstance(other, Intersection):
return Intersection(self, *other.nodes)
else:
return Intersection(self, other)
def __or__(self, other):
if isinstance(other, Union):
return Union(self, *other.nodes)
else:
return Union(self, other)
def __invert__(self):
return -self.surface if self.side == '+' else +self.surface
def __contains__(self, point):
"""Check whether a point is contained in the half-space.
Parameters
----------
point : 3-tuple of float
Cartesian coordinates, :math:`(x',y',z')`, of the point
Returns
-------
bool
Whether the point is in the half-space
"""
val = self.surface.evaluate(point)
return val >= 0. if self.side == '+' else val < 0.
@property
def surface(self):
return self._surface
@surface.setter
def surface(self, surface):
check_type('surface', surface, Surface)
self._surface = surface
@property
def side(self):
return self._side
@side.setter
def side(self, side):
check_value('side', side, ('+', '-'))
self._side = side
@property
def bounding_box(self):
return self.surface.bounding_box(self.side)
def __str__(self):
return '-' + str(self.surface.id) if self.side == '-' \
else str(self.surface.id)
[docs] def get_surfaces(self, surfaces=None):
"""
Returns the surface that this is a halfspace of.
Parameters
----------
surfaces: collections.OrderedDict, optional
Dictionary mapping surface IDs to :class:`openmc.Surface` instances
Returns
-------
surfaces: collections.OrderedDict
Dictionary mapping surface IDs to :class:`openmc.Surface` instances
"""
if surfaces is None:
surfaces = OrderedDict()
surfaces[self.surface.id] = self.surface
return surfaces
[docs] def clone(self, memo=None):
"""Create a copy of this halfspace, with a cloned surface with a
unique ID.
Parameters
----------
memo : dict or None
A nested dictionary of previously cloned objects. This parameter
is used internally and should not be specified by the user.
Returns
-------
clone : openmc.Halfspace
The clone of this halfspace
"""
if memo is None:
memo = dict
clone = deepcopy(self)
clone.surface = self.surface.clone(memo)
return clone
[docs]def get_rectangular_prism(width, height, axis='z', origin=(0., 0.),
boundary_type='transmission'):
"""Get an infinite rectangular prism from four planar surfaces.
Parameters
----------
width: float
Prism width in units of cm. The width is aligned with the y, x,
or x axes for prisms parallel to the x, y, or z axis, respectively.
height: float
Prism height in units of cm. The height is aligned with the z, z,
or y axes for prisms parallel to the x, y, or z axis, respectively.
axis : {'x', 'y', 'z'}
Axis with which the infinite length of the prism should be aligned.
Defaults to 'z'.
origin: Iterable of two floats
Origin of the prism. The two floats correspond to (y,z), (x,z) or
(x,y) for prisms parallel to the x, y or z axis, respectively.
Defaults to (0., 0.).
boundary_type : {'transmission, 'vacuum', 'reflective', 'periodic'}
Boundary condition that defines the behavior for particles hitting the
surfaces comprising the rectangular prism (default is 'transmission').
Returns
-------
openmc.Region
The inside of a rectangular prism
"""
check_type('width', width, Real)
check_type('height', height, Real)
check_value('axis', axis, ['x','y','z'])
check_type('origin', origin, Iterable, Real)
if axis == 'x':
min_y = YPlane(name='minimum y', y0=-width/2.+origin[0],
boundary_type=boundary_type)
max_y = YPlane(name='maximum y', y0=+width/2.+origin[0],
boundary_type=boundary_type)
min_z = ZPlane(name='minimum z', z0=-height/2.+origin[1],
boundary_type=boundary_type)
max_z = ZPlane(name='maximum z', z0=+height/2.+origin[1],
boundary_type=boundary_type)
prism = +min_y & -max_y & +min_z & -max_z
elif axis == 'y':
min_x = XPlane(name='minimum x', x0=-width/2.+origin[0],
boundary_type=boundary_type)
max_x = XPlane(name='maximum x', x0=+width/2.+origin[0],
boundary_type=boundary_type)
min_z = ZPlane(name='minimum z', z0=-height/2.+origin[1],
boundary_type=boundary_type)
max_z = ZPlane(name='maximum z', z0=+height/2.+origin[1],
boundary_type=boundary_type)
prism = +min_x & -max_x & +min_z & -max_z
else:
min_x = XPlane(name='minimum x', x0=-width/2.+origin[0],
boundary_type=boundary_type)
max_x = XPlane(name='maximum x', x0=+width/2.+origin[0],
boundary_type=boundary_type)
min_y = YPlane(name='minimum y', y0=-height/2.+origin[1],
boundary_type=boundary_type)
max_y = YPlane(name='maximum y', y0=+height/2.+origin[1],
boundary_type=boundary_type)
prism = +min_x & -max_x & +min_y & -max_y
return prism
[docs]def get_hexagonal_prism(edge_length=1., orientation='y',
boundary_type='transmission'):
"""Create a hexagon region from six surface planes.
Parameters
----------
edge_length : float
Length of a side of the hexagon in cm
orientation : {'x', 'y'}
An 'x' orientation means that two sides of the hexagon are parallel to
the x-axis and a 'y' orientation means that two sides of the hexagon are
parallel to the y-axis.
boundary_type : {'transmission, 'vacuum', 'reflective', 'periodic'}
Boundary condition that defines the behavior for particles hitting the
surfaces comprising the hexagonal prism (default is 'transmission').
Returns
-------
openmc.Region
The inside of a hexagonal prism
"""
l = edge_length
if orientation == 'y':
right = XPlane(x0=sqrt(3.)/2.*l)
left = XPlane(x0=-sqrt(3.)/2.*l)
c = sqrt(3.)/3.
# y = -x/sqrt(3) + a
upper_right = Plane(A=c, B=1., D=l, boundary_type=boundary_type)
# y = x/sqrt(3) + a
upper_left = Plane(A=-c, B=1., D=l, boundary_type=boundary_type)
# y = x/sqrt(3) - a
lower_right = Plane(A=-c, B=1., D=-l, boundary_type=boundary_type)
# y = -x/sqrt(3) - a
lower_left = Plane(A=c, B=1., D=-l, boundary_type=boundary_type)
return Intersection(-right, +left, -upper_right, -upper_left,
+lower_right, +lower_left)
elif orientation == 'x':
top = YPlane(y0=sqrt(3.)/2.*l)
bottom = YPlane(y0=-sqrt(3.)/2.*l)
c = sqrt(3.)
# y = -sqrt(3)*(x - a)
upper_right = Plane(A=c, B=1., D=c*l, boundary_type=boundary_type)
# y = sqrt(3)*(x + a)
lower_right = Plane(A=-c, B=1., D=-c*l, boundary_type=boundary_type)
# y = -sqrt(3)*(x + a)
lower_left = Plane(A=c, B=1., D=-c*l, boundary_type=boundary_type)
# y = sqrt(3)*(x + a)
upper_left = Plane(A=-c, B=1., D=c*l, boundary_type=boundary_type)
return Intersection(-top, +bottom, -upper_right, +lower_right,
+lower_left, -upper_left)