terrapower / armi / 179
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Reduce numerical diffusion in mesh mapping. (#67)

* Reduce numerical diffusion in mesh mapping.

In the uniform mesh mapping operation, axial meshes are mapped
to other axial meshes to accomodate certain physics calculations
that have limited axial mesh constraints. In some cases, this can
cause meaningful numerical diffusion (e.g. when a small block is
above a large block, the large block can get lots of the physics
results and smear them out). This can be reduced with finer meshes,
but we can also make some improvements by deriving some parameters
based on higher-level ones (like flux).

This change prevents the mesh mapping of a few neutronics-related
reaction rate parameters and re-derives them from the mapped
multigroup flux instead.

Note that calcReactionRates is fairly slow.

* Moved calcReactionRates out of blocks.py into the more
  reasonable globalFluxInterface.py for physics scope reasons

* Made small performance enhancements of calcReactionRates too

* Added testing coverage of calcReactionRates (it was actually
  broken)

* Had to make some test fixtures more physically relevant with
  microscopic cross sections that can actually be used because
  now the reaction rate calc is occurring in all tests that do
  mesh mapping. Eventually we will update ISOAA to have
  more appropriate nuclides in it.

* buGroup added to components related to a previous change. Needed
  during compononent-level depletion (rather than block-level)

30152 of 39223 relevant lines covered (76.87%)

0.77 hits per line

Jobs
ID Job ID Ran Files Coverage
3 179.3 (TOXENV=cov,report) 0
76.87
 Travis Job 179.3
Source Files on build 179
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