mirror of
https://github.com/openmc-dev/openmc.git
synced 2026-07-29 06:35:48 -04:00
Updated user's guide to reflect all changes to input.
This commit is contained in:
Paul Romano
parent
70e9ecf68e
commit
8de5a99c1f
2 changed files with 186 additions and 55 deletions
|
|
@ -94,6 +94,9 @@ could be written as::
|
|||
|
||||
</geometry>
|
||||
|
||||
``surface`` Element
|
||||
-------------------
|
||||
|
||||
Each ``surface`` element can have the following attributes or sub-elements:
|
||||
|
||||
:id:
|
||||
|
|
@ -118,6 +121,46 @@ Each ``surface`` element can have the following attributes or sub-elements:
|
|||
|
||||
*Default*: ``reflective``
|
||||
|
||||
The following quadratic surfaces can be modeled:
|
||||
|
||||
:x-plane:
|
||||
A plane perpendicular to the x axis, i.e. a surface of the form :math:`x -
|
||||
x_0 = 0`. The coefficients specified are ":math:`x_0`".
|
||||
|
||||
:y-plane:
|
||||
A plane perpendicular to the y axis, i.e. a surface of the form :math:`y -
|
||||
y_0 = 0`. The coefficients specified are ":math:`y_0`".
|
||||
|
||||
:z-plane:
|
||||
A plane perpendicular to the z axis, i.e. a surface of the form :math:`z -
|
||||
z_0 = 0`. The coefficients specified are ":math:`z_0`".
|
||||
|
||||
:plane:
|
||||
An arbitrary plane of the form :math:`Ax + By + Cz = D`. The coefficients
|
||||
specified are ":math:`A \: B \: C \: D`".
|
||||
|
||||
:x-cylinder:
|
||||
An infinite cylinder whose length is paralle to the x-axis. This is a
|
||||
quadratic surface of the form :math:`(y - y_0)^2 + (z - z_0)^2 = R^2`. The
|
||||
coefficients specified are ":math:`y_0 \: z_0 \: R`".
|
||||
|
||||
:y-cylinder:
|
||||
An infinite cylinder whose length is paralle to the y-axis. This is a
|
||||
quadratic surface of the form :math:`(x - x_0)^2 + (z - z_0)^2 = R^2`. The
|
||||
coefficients specified are ":math:`x_0 \: z_0 \: R`".
|
||||
|
||||
:z-cylinder:
|
||||
An infinite cylinder whose length is paralle to the z-axis. This is a
|
||||
quadratic surface of the form :math:`(x - x_0)^2 + (y - y_0)^2 = R^2`. The
|
||||
coefficients specified are ":math:`x_0 \: y_0 \: R`".
|
||||
|
||||
:sphere:
|
||||
A sphere of the form :math:`(x - x_0)^2 + (y - y_0)^2 + (z - z_0)^2 =
|
||||
R^2`. The coefficients specified are ":math:`x_0 \: y_0 \: z_0 \: R`".
|
||||
|
||||
``cell`` Element
|
||||
----------------
|
||||
|
||||
Each ``cell`` element can have the following attributes or sub-elements:
|
||||
|
||||
:id:
|
||||
|
|
@ -151,42 +194,43 @@ Each ``cell`` element can have the following attributes or sub-elements:
|
|||
|
||||
*Default*: None
|
||||
|
||||
The following quadratic surfaces can be modeled:
|
||||
``lattice`` Element
|
||||
-------------------
|
||||
|
||||
:x-plane:
|
||||
A plane perpendicular to the x axis, i.e. a surface of the form :math:`x - x_0
|
||||
= 0`. The coefficients specified are ":math:`x_0`".
|
||||
The ``lattice`` can be used to represent repeating structures (e.g. fuel pins in
|
||||
an assembly) or other geometry which naturally fits into a two-dimensional
|
||||
structured mesh. Each cell within the lattice is filled with a specified
|
||||
universe. A ``lattice`` accepts the following attributes or sub-elements:
|
||||
|
||||
:y-plane:
|
||||
A plane perpendicular to the y axis, i.e. a surface of the form :math:`y - y_0
|
||||
= 0`. The coefficients specified are ":math:`y_0`".
|
||||
:id:
|
||||
A unique integer that can be used to identify the surface.
|
||||
|
||||
:z-plane:
|
||||
A plane perpendicular to the z axis, i.e. a surface of the form :math:`z - z_0
|
||||
= 0`. The coefficients specified are ":math:`z_0`".
|
||||
:type:
|
||||
A string indicating the arrangement of lattice cells. Accepted options are
|
||||
"rectangular" and "hexagonal".
|
||||
|
||||
:plane:
|
||||
An arbitrary plane of the form :math:`Ax + By + Cz = D`. The coefficients
|
||||
specified are ":math:`A \: B \: C \: D`".
|
||||
*Default*: rectangular
|
||||
|
||||
:x-cylinder:
|
||||
An infinite cylinder whose length is paralle to the x-axis. This is a
|
||||
quadratic surface of the form :math:`(y - y_0)^2 + (z - z_0)^2 = R^2`. The
|
||||
coefficients specified are ":math:`y_0 \: z_0 \: R`".
|
||||
:dimension:
|
||||
Two integers representing the number of lattice cells in the x- and y-
|
||||
directions, respectively.
|
||||
|
||||
:y-cylinder:
|
||||
An infinite cylinder whose length is paralle to the y-axis. This is a
|
||||
quadratic surface of the form :math:`(x - x_0)^2 + (z - z_0)^2 = R^2`. The
|
||||
coefficients specified are ":math:`x_0 \: z_0 \: R`".
|
||||
*Default*: None
|
||||
|
||||
:z-cylinder:
|
||||
An infinite cylinder whose length is paralle to the z-axis. This is a
|
||||
quadratic surface of the form :math:`(x - x_0)^2 + (y - y_0)^2 = R^2`. The
|
||||
coefficients specified are ":math:`x_0 \: y_0 \: R`".
|
||||
:origin:
|
||||
The coordinates of the lower-left corner of the lattice.
|
||||
|
||||
:sphere:
|
||||
A sphere of the form :math:`(x - x_0)^2 + (y - y_0)^2 + (z - z_0)^2 =
|
||||
R^2`. The coefficients specified are ":math:`x_0 \: y_0 \: z_0 \: R`".
|
||||
*Default*: None
|
||||
|
||||
:width:
|
||||
The width of the lattice cell in the x- and y- directions.
|
||||
|
||||
*Default*: None
|
||||
|
||||
:universes:
|
||||
A list of the universe numbers that fill each cell of the lattice.
|
||||
|
||||
*Default*: None
|
||||
|
||||
.. _constructive solid geometry: http://en.wikipedia.org/wiki/Constructive_solid_geometry
|
||||
|
||||
|
|
@ -196,8 +240,14 @@ The following quadratic surfaces can be modeled:
|
|||
Materials Specification -- materials.xml
|
||||
----------------------------------------
|
||||
|
||||
``material`` Element
|
||||
--------------------
|
||||
|
||||
Each ``material`` element can have the following attributes or sub-elements:
|
||||
|
||||
:id:
|
||||
A unique integer that can be used to identify the material.
|
||||
|
||||
:density:
|
||||
An element with attributes/sub-elements called ``value`` and ``units``. The
|
||||
``value`` attribute is the numeric value of the density while the ``units``
|
||||
|
|
@ -209,7 +259,6 @@ Each ``material`` element can have the following attributes or sub-elements:
|
|||
*Default*: None
|
||||
|
||||
:nuclide:
|
||||
|
||||
An element with attributes/sub-elements called ``name``, ``xs``, and ``ao``
|
||||
or ``wo``. The ``name`` attribute is the name of the cross-section for a
|
||||
desired nuclide while the ``xs`` attribute is the cross-section
|
||||
|
|
@ -225,25 +274,35 @@ Each ``material`` element can have the following attributes or sub-elements:
|
|||
|
||||
*Default*: None
|
||||
|
||||
:sab:
|
||||
Associates an S(a,b) table with the material. This element has
|
||||
attributes/sub-elements called ``name`` and ``xs``. The ``name`` attribute
|
||||
is the name of the S(a,b) table that should be associated with the material,
|
||||
and ``xs`` is the cross-section identifier for the table.
|
||||
|
||||
*Default*: None
|
||||
|
||||
``default_xs`` Element
|
||||
----------------------
|
||||
|
||||
In some circumstances, the cross-section identifier may be the same for many or
|
||||
all nuclides in a given problem. In this case, rather than specifying the
|
||||
``xs=...`` attribute on every nuclide, a ``default_xs`` element can be used to
|
||||
set the default cross-section identifier for any nuclide without an identifier
|
||||
explicitly listed. This element has no attributes and accepts a 3-letter string
|
||||
that indicates the default cross-section identifier, e.g. "70c".
|
||||
|
||||
*Default*: None
|
||||
|
||||
--------------------------------------
|
||||
Settings Specification -- settings.xml
|
||||
--------------------------------------
|
||||
|
||||
All simulation parameters and miscellaneous options are specified in the
|
||||
settings.xml file. The following elements can be specified:
|
||||
settings.xml file.
|
||||
|
||||
- ``cross_sections``
|
||||
- ``criticality``
|
||||
- ``verbosity``
|
||||
- ``source``
|
||||
- ``survival_biasing``
|
||||
- ``cutoff``
|
||||
|
||||
The ``cross_sections`` element has no attributes and simply indicates the path
|
||||
to an XML cross section listing file (usually named ``cross_sections.xml``. If
|
||||
this element is absent from the ``settings.xml`` file, the environment variable
|
||||
``CROSS_SECTIONS`` will be used to find the path to the XML cross section
|
||||
listing.
|
||||
``criticality`` Element
|
||||
-----------------------
|
||||
|
||||
The ``criticality`` element indicates that a criticality calculation should be
|
||||
performed. It has the following attributes/sub-elements:
|
||||
|
|
@ -266,14 +325,25 @@ performed. It has the following attributes/sub-elements:
|
|||
|
||||
*Default*: None
|
||||
|
||||
The ``verbosity`` element tells the code how much information to display to the
|
||||
standard output. A higher verbosity corresponds to more information being
|
||||
displayed. This element takes the following attributes:
|
||||
``cross_sections`` Element
|
||||
--------------------------
|
||||
|
||||
:value:
|
||||
The specified verbosity between 1 and 10.
|
||||
The ``cross_sections`` element has no attributes and simply indicates the path
|
||||
to an XML cross section listing file (usually named cross_sections.xml). If this
|
||||
element is absent from the settings.xml file, the environment variable
|
||||
``CROSS_SECTIONS`` will be used to find the path to the XML cross section
|
||||
listing.
|
||||
|
||||
*Default*: 5
|
||||
``cutoff`` Element
|
||||
------------------
|
||||
|
||||
The ``cutoff`` element has no attributes and indicates the weight cutoff used
|
||||
below which particles undergo Russian roulette.
|
||||
|
||||
*Default*: 0.25
|
||||
|
||||
``source`` Element
|
||||
------------------
|
||||
|
||||
The ``source`` element gives information on an initial source guess for
|
||||
criticality calculations. It takes the following attributes:
|
||||
|
|
@ -288,16 +358,26 @@ criticality calculations. It takes the following attributes:
|
|||
and the last three of which specify the upper-right corner. Source sites are
|
||||
sampled uniformly through that parallelepiped.
|
||||
|
||||
The ``survival_biasing`` element as no attributes and assumes wither the
|
||||
``survival_biasing`` Element
|
||||
----------------------------
|
||||
|
||||
The ``survival_biasing`` element has no attributes and assumes wither the
|
||||
value ``on`` or ``off``. If turned on, this option will enable the use of
|
||||
survival biasing, otherwise known as implicit capture or absorption.
|
||||
|
||||
*Default*: off
|
||||
|
||||
The ``cutoff`` element has no attributes and indicates the weight cutoff used
|
||||
below which particles undergo Russian roulette.
|
||||
``verbosity`` Element
|
||||
---------------------
|
||||
|
||||
*Default*: 0.25
|
||||
The ``verbosity`` element tells the code how much information to display to the
|
||||
standard output. A higher verbosity corresponds to more information being
|
||||
displayed. This element takes the following attributes:
|
||||
|
||||
:value:
|
||||
The specified verbosity between 1 and 10.
|
||||
|
||||
*Default*: 5
|
||||
|
||||
------------------------------------
|
||||
Tallies Specification -- tallies.xml
|
||||
|
|
@ -317,8 +397,12 @@ filters can be used for a tally. The following types of filter are available:
|
|||
cell, universe, material, surface, birth region, pre-collision energy,
|
||||
post-collision energy, and an arbitrary structured mesh.
|
||||
|
||||
The two valid elements in the tallies.xml file are ``tally`` and ``mesh``. The
|
||||
``tally`` element accepts the following sub-elements:
|
||||
The two valid elements in the tallies.xml file are ``tally`` and ``mesh``.
|
||||
|
||||
``tally`` Element
|
||||
-----------------
|
||||
|
||||
The ``tally`` element accepts the following sub-elements:
|
||||
|
||||
:filters:
|
||||
A list of filters to specify what region of phase space should contribute to
|
||||
|
|
@ -398,6 +482,9 @@ The following responses can be tallied.
|
|||
:nu-fission:
|
||||
Total production of neutrons due to fission
|
||||
|
||||
``mesh`` Element
|
||||
----------------
|
||||
|
||||
If a structured mesh is desired as a filter for a tally, it must be specified in
|
||||
a separate element with the tag name ``mesh``. This element has the following
|
||||
attributes/sub-elements:
|
||||
|
|
@ -415,3 +502,47 @@ attributes/sub-elements:
|
|||
|
||||
:width:
|
||||
The width of mesh cells in each direction.
|
||||
|
||||
-------------------------------------------
|
||||
Geometry Plotting Specification -- plot.xml
|
||||
-------------------------------------------
|
||||
|
||||
A rudimentary plotting capability is available in OpenMC by specifying a
|
||||
plot.xml file and subsequently running with the command-line flag ``-plot``. The
|
||||
root element of the plot.xml is simply ``<plot>`` and four sub-elements can be
|
||||
defined to configure the plotting range and resolution.
|
||||
|
||||
``origin`` Element
|
||||
------------------
|
||||
|
||||
The ``origin`` element has no attributes/sub-elements and indicates the
|
||||
Cartesian coordinates of the center of the plot.
|
||||
|
||||
*Default*: None
|
||||
|
||||
``width`` Element
|
||||
-----------------
|
||||
|
||||
The ``width`` element has no attributes/sub-elements and indicates the width of
|
||||
the plot in each of the basis directions.
|
||||
|
||||
*Default*: None
|
||||
|
||||
``basis`` Element
|
||||
-----------------
|
||||
|
||||
The ``basis`` element has no attributes/sub-elements and indicates the specified
|
||||
basis for plotting.
|
||||
|
||||
.. note:: The only accepted option currently is "xy"
|
||||
|
||||
*Default*: xy
|
||||
|
||||
``pixel`` Element
|
||||
-----------------
|
||||
|
||||
The ``pixel`` element has no attributes/sub-elements and indicates the distance
|
||||
between horizontal rays sent through the geometry to record surface crossings. A
|
||||
smaller ``pixel`` will result in a higher-resolution plot.
|
||||
|
||||
*Default*: 0.01
|
||||
|
|
|
|||
|
|
@ -22,7 +22,7 @@
|
|||
|
||||
<typedef name="lattice_xml">
|
||||
<component name="id" type="integer" />
|
||||
<component name="type" type="word" length="12" />
|
||||
<component name="type" type="word" length="12" default="'rectangular'" />
|
||||
<component name="dimension" type="integer-array" />
|
||||
<component name="origin" type="double-array" />
|
||||
<component name="width" type="double-array" />
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue