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Code Issues Projects Releases Packages Wiki Activity Actions 5

Merge remote-tracking branch 'upstream/develop' into hex_lattice

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Conflicts:
	src/geometry.F90
	src/hdf5_summary.F90
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Sterling Harper 2015-01-08 19:05:24 -05:00
commit 1f7f0ad2e6
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51
docs/source/methods/cross_sections.rst
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@ -47,45 +47,28 @@ there would be for burnup calculations. Thus, there is a strong motive to
implement a method of reducing the number of energy grid searches in order to
speed up the calculation.
Unionized Energy Grid
---------------------
Logarithmic Mapping
-------------------
The most naïve method to reduce the number of energy grid searches is to
construct a new energy grid that consists of the union of the energy points of
each nuclide and use this energy grid for all nuclides. This method is
computationally very efficient as it only requires one energy grid search at
each collision as well as one interpolation between cross section values since
the interpolation factor can be used for all nuclides. However, it requires
redundant storage of cross section values at points which were added to each
nuclide grid. This additional burden on memory storage can become quite
prohibitive. To lessen that burden, the unionized energy grid can be thinned
with cross sections reconstructed on the thinned energy grid. This method is
currently used by default in the Serpent Monte Carlo code.
To speed up energy grid searches, OpenMC uses logarithmic mapping technique
[Brown]_ to limit the range of energies that must be searched for each
nuclide. The entire energy range is divided up into equal-lethargy segments, and
the bounding energies of each segment are mapped to bounding indices on each of
the nuclide energy grids. By default, OpenMC uses 8000 equal-lethargy segments
as recommended by Brown.
Unionized Energy Grid with Nuclide Pointers
-------------------------------------------
Other Methods
-------------
While having a unionized grid that is used for all nuclides allows for very fast
lookup of cross sections, the burden on memory is in many circumstances
unacceptable. The OpenMC Monte Carlo code utilizes a method that allows for a
single energy grid search to be performed at every collision while avoiding the
redundant storage of cross section values. Instead of using the unionized grid
for every nuclide, the original energy grid of each nuclide is kept and a list
of pointers (of the same length as the unionized energy grid) is constructed for
each nuclide that gives the corresponding grid index on the nuclide grid for a
given grid index on the unionized grid. One must still interpolate on cross
section values for each nuclide since the interpolation factors will generally
be different. The figure below illustrates this method. All values within the
dashed box would need to be stored on a per-nuclide basis, and the union grid
would need to be stored once. This method is also referred to as *double
indexing* and is available as an option in Serpent (see paper by Leppanen_).
A good survey of other energy grid techniques, including unionized energy grids,
can be found in a paper by Leppanen_.
.. figure:: ../_images/uniongrid.*
:width: 600px
:align: center
:figclass: align-center
----------
References
----------
Mapping of union energy grid to nuclide energy grid through pointers.
.. [Brown] Forrest B. Brown, "New Hash-based Energy Lookup Algorithm for Monte
Carlo codes," LA-UR-14-24530, Los Alamos National Laboratory (2014).
.. _MCNP: http://mcnp.lanl.gov
.. _Serpent: http://montecarlo.vtt.fi

2
docs/source/methods/geometry.rst
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@ -516,7 +516,7 @@ satisfy the following equations
x^2 + y^2 + z^2 - 10^2 < 0 \\
x - (-3) > 0 \\
x - 2 < 0
y - 2 < 0
In order to determine if a point is inside the cell, we would substitute its
coordinates into equation :eq:`cell-contains-example`. If the inequalities are

17
docs/source/methods/physics.rst
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@ -682,17 +682,20 @@ nuclear temperature, which is a function of the incoming energy of the
neutron. The ACE format contains a list of nuclear temperatures versus incoming
energies. The nuclear temperature is interpolated between neighboring incoming
energies using a specified interpolation law. Once the temperature :math:`T` is
determined, we then calculate a candidate outgoing energy based on rule C45 in
the `Monte Carlo Sampler`_:
determined, we then calculate a candidate outgoing energy based on the algorithm
given in LA-UR-14-27694_:
.. math::
:label: evaporation-E
E' = -T \log (\xi_1 \xi_2)
E' = -T \log ((1 - g\xi_1)(1 - g\xi_2))
where :math:`\xi_1, \xi_2` are random numbers sampled on the unit
interval. The outgoing energy is only accepted according to a specified
restriction energy as in equation :eq:`maxwell-restriction`.
where :math:`g = 1 - e^{-w}`, :math:`w = (E - U)/T`, :math:`U` is the
restriction energy, and :math:`\xi_1, \xi_2` are random numbers sampled on the
unit interval. The outgoing energy is only accepted according to the restriction
energy as in equation :eq:`maxwell-restriction`. This algorithm has a much
higher rejection efficiency than the standard technique, i.e. rule C45 in the
`Monte Carlo Sampler`_.
ACE Law 11 - Energy-Dependent Watt Spectrum
+++++++++++++++++++++++++++++++++++++++++++
@ -1591,6 +1594,8 @@ References
.. _Monte Carlo Sampler: https://laws.lanl.gov/vhosts/mcnp.lanl.gov/pdf_files/la-9721_3rdmcsampler.pdf
.. _LA-UR-14-27694: http://permalink.lanl.gov/object/tr?what=info:lanl-repo/lareport/LA-UR-14-27694
.. _MC21: http://www.osti.gov/bridge/servlets/purl/903083-HT5p1o/903083.pdf
.. _Sutton and Brown: http://www.osti.gov/bridge/product.biblio.jsp?osti_id=307911

7
docs/source/quickinstall.rst
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@ -35,9 +35,9 @@ OpenMC from source as is described in :ref:`usersguide_install`.
Installing from Source on Linux or Mac OS X
-------------------------------------------
All OpenMC source code is hosted on GitHub_. If you have git_ and the gfortran_
compiler installed, you can download and install OpenMC be entering the
following commands in a terminal:
All OpenMC source code is hosted on GitHub_. If you have git_, the gfortran_
compiler, and CMake_ installed, you can download and install OpenMC be entering
the following commands in a terminal:
.. code-block:: sh
@ -58,3 +58,4 @@ can be replaced with a local install, e.g.
.. _GitHub: https://github.com/mit-crpg/openmc
.. _git: http://git-scm.com
.. _gfortran: http://gcc.gnu.org/wiki/GFortran
.. _CMake: http://www.cmake.org

46
docs/source/usersguide/input.rst
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@ -134,13 +134,15 @@ should be performed. It has the following attributes/sub-elements:
-------------------------
The ``<energy_grid>`` element determines the treatment of the energy grid during
a simulation. Setting this element to "nuclide" will cause OpenMC to use a
nuclide's energy grid when determining what points to interpolate between for
determining cross sections (i.e. non-unionized energy grid). To use a unionized
energy grid, set this element to "union". Note that the unionized energy grid
treatment is slightly different than that employed in Serpent.
a simulation. The valid options are "nuclide" and "logarithm". Setting this
element to "nuclide" will cause OpenMC to use a nuclide's energy grid when
determining what points to interpolate between for determining cross sections
(i.e. non-unionized energy grid). Setting this element to "logarithm" causes
OpenMC to use a logarithmic mapping technique described in LA-UR-14-24530_.
*Default*: union
*Default*: logarithm
.. _LA-UR-14-24530: https://laws.lanl.gov/vhosts/mcnp.lanl.gov/pdf_files/la-ur-14-24530.pdf
``<entropy>`` Element
---------------------
@ -182,6 +184,16 @@ performed. It has the following attributes/sub-elements:
*Default*: None
``<log_grid_bins>`` Element
---------------------------
The ``<log_grid_bins>`` element indicates the number of bins to use for the
logarithmic-mapped energy grid. Using more bins will result in energy grid
searches over a smaller range at the expense of more memory. The default is
based on the recommended value in LA-UR-14-24530_.
*Default*: 8000
.. _natural_elements:
``<natural_elements>`` Element
@ -1097,6 +1109,16 @@ The ``<tally>`` element accepts the following sub-elements:
*Default*: total
:estimator:
The estimator element is used to force the use of either ``analog`` or
``tracklength`` tally estimation. ''analog'' is generally less efficient
though it can be used with every score type. ''tracklength'' is generally
the most efficient, though its usage is restricted to tallies that do not
score particle information which requires a collision to have occured, such
as a scattering tally which utilizes outgoing energy filters.
*Default*: ``tracklength`` but will revert to analog if necessary.
:scores:
A space-separated list of the desired responses to be accumulated. Accepted
options are "flux", "total", "scatter", "absorption", "fission",
@ -1647,3 +1669,15 @@ into MATLAB using PETSc-MATLAB utilities. This option can be
turned on with "true" and off with "false".
*Default*: false
------------------------------------
ERSN-OpenMC Graphical User Interface
------------------------------------
A third-party Java-based user-friendly graphical user interface for creating XML
input files called ERSN-OpenMC_ is developed and maintained by members of the
Radiation and Nuclear Systems Group at the Faculty of Sciences Tetouan, Morocco.
The GUI also allows one to automatically download prerequisites for installing and
running OpenMC.
.. _ERSN-OpenMC: https://github.com/EL-Bakkali-Jaafar/ERSN-OpenMC