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Code Issues Projects Releases Packages Wiki Activity Actions 5

Support for tabular angular and energy distributions.

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Implemented new polymorphic Distribution type which is used by
AngleDistribution, both of which appear in distribution_header.
This commit is contained in:
Paul Romano 2015-11-09 16:41:44 -06:00
parent c737c1f692
commit 2abc9f1e29
14 changed files with 563 additions and 257 deletions
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60
docs/source/usersguide/input.rst
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@ -440,7 +440,6 @@ attributes/sub-elements:
has the following attributes:
:type:
The type of spatial distribution. Valid options are "box", "fission", and
"point". A "box" spatial distribution has coordinates sampled uniformly in
a parallelepiped. A "fission" spatial distribution samples locations from
@ -468,14 +467,23 @@ attributes/sub-elements:
has the following attributes:
:type:
The type of angular distribution. Valid options are "isotropic" and
"monodirectional". The angle of the particle emitted from a source site is
isotropic if the "isotropic" option is given. The angle of the particle
emitted from a source site is the direction specified in the <parameters>
attribute if "monodirectional" option is given.
The type of angular distribution. Valid options are "isotropic",
"monodirectional", and "tabular". The angle of the particle emitted from a
source site is isotropic if the "isotropic" option is given. The angle of
the particle emitted from a source site is the direction specified in the
<parameters> attribute if "monodirectional" option is given. The "tabular"
option produces directions with polar angles sampled from a tabulated
distribution.
*Default*: isotropic
:interpolation:
For a "tabular" angular distribution, ``interpolation`` can be set to
"histogram" or "linear-linear" thereby specifying how tabular points are
to be interpolated.
*Default*: histogram
:parameters:
For an "isotropic" angular distribution, ``parameters`` should not be
specified.
@ -484,6 +492,22 @@ attributes/sub-elements:
given as three real numbers which specify the angular cosines with respect
to each axis.
For a "tabular" angular distribution, ``parameters`` provides the
:math:`(\mu,p)` pairs defining the tabular distribution. All :math:`\mu`
points are given first followed by corresponding :math:`p` points. The
following example gives a histogram distribution with even probability of
selecting a polar angle in the range [-1,-0.5] and [0.5,1] (Note that the
last :math:`p` point is inconsequential):
.. code-block:: xml
<angle type="tabular" interpolation="histogram">
<parameters>
-1.0 -0.5 0.5 1.0
1.0 0.0 1.0 0.0
</parameters>
</angle>
*Default*: None
:energy:
@ -491,15 +515,23 @@ attributes/sub-elements:
has the following attributes:
:type:
The type of energy distribution. Valid options are "monoenergetic",
"watt", and "maxwell". The "monoenergetic" option produces source sites at
a single energy. The "watt" option produces source sites whose energy is
sampled from a Watt fission spectrum. The "maxwell" option produce source
sites whose energy is sampled from a Maxwell fission spectrum.
"watt", "maxwell", and "tabular". The "monoenergetic" option produces
source sites at a single energy. The "watt" option produces source sites
whose energy is sampled from a Watt fission spectrum. The "maxwell" option
produce source sites whose energy is sampled from a Maxwell fission
spectrum. The "tabular" option produces source sites whose energy is
sampled from a tabulated distribution.
*Default*: watt
:interpolation:
For a "tabular" angular distribution, ``interpolation`` can be set to
"histogram" or "linear-linear" thereby specifying how tabular points are
to be interpolated.
*Default*: histogram
:parameters:
For a "monoenergetic" energy distribution, ``parameters`` should be
given as the energy in MeV of the source sites.
@ -512,6 +544,10 @@ attributes/sub-elements:
real number :math:`a` that parameterizes the distribution :math:`p(E) dE =
c E e^{-E/a} dE`.
For a "tabular" energy distribution, ``parameters`` provides the
:math:`(E,p)` pairs defining the tabular distribution. All :math:`E`
points are given first followed by corresponding :math:`p` points.
*Default*: 0.988 2.249
:write_initial:
@ -519,7 +555,7 @@ attributes/sub-elements:
the beginning of the first batch. The output file is named
"initial_source.binary(h5)"
*Default*: false
*Default*: false
``<state_point>`` Element
-------------------------