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Random Ray Normalization Improvements (#3051)

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Co-authored-by: Olek <45364492+yardasol@users.noreply.github.com>
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John Tramm 2024-06-28 11:41:20 -05:00 • committed by GitHub
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docs/source/usersguide/random_ray.rst
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@ -330,6 +330,8 @@ of a two-dimensional 2x2 reflective pincell lattice:
In the future, automated subdivision of FSRs via mesh overlay may be supported.
.. _usersguide_flux_norm:
-------
Tallies
-------
@ -367,6 +369,25 @@ Note that there is no difference between the analog, tracklength, and collision
estimators in random ray mode as individual particles are not being simulated.
Tracklength-style tally estimation is inherent to the random ray method.
As discussed in the random ray theory section on :ref:`Random Ray
Tallies<methods_random_tallies>`, by default flux tallies in the random ray mode
are not normalized by the spatial tally volumes such that flux tallies are in
units of cm. While the volume information is readily available as a byproduct of
random ray integration, the flux value is reported in unnormalized units of cm
so that the user will be able to compare "apples to apples" with the default
flux tallies from the Monte Carlo solver (also reported by default in units of
cm). If volume normalized flux tallies (in units of cm\ :sup:`-2`) are desired,
then the user can set the ``volume_normalized_flux_tallies`` field in the
:attr:`openmc.Settings.random_ray` dictionary to ``True``. An example is given
below:
::
settings.random_ray['volume_normalized_flux_tallies'] = True
Note that MC mode flux tallies can also be normalized by volume, as discussed in
the :ref:`Volume Calculation Section<usersguide_volume>` of the user guide.
--------
Plotting
--------