Stochastic particle reflection from absorbing domain boundaries (#2281)

* added tunable particle reflection from absorbing domain boundaries

* extended picmi.py to allow setting boundary reflection coefficients and added a CI test for the reflection implementation

* allow R(E) to be specified, except for embedded boundaries

* changed approach for particle reflection, now the ParticleBoundaries object will hold the reflection coefficient; reflection from EBs not implemented

* added functionality to reflect from EB; still needs to be tested for accuracy

* added support for energy dependent reflection models for domain boundaries

* fixed at least one issue causing CI fails - building reflection model parsers for not physical particle containers

* switched reflection coefficients to be functions of the velocity component perpendicular to the boundary rather than energy

* reverted initial work on reflecting from EBs

* changed naming convention for new CI test for particle reflection

* switched useMPI back to 1 in test

* breaking changes while trying to sort out GPU issue

* fixed issue with CUDA compilation - hopefully :)

* various code improvements from PR review suggestions

* fix of major issues

* no need to parse the reflection models at every step

* skip particles that are already flagged for removal in ApplyBoundaryConditions

1 files changed, 15 insertions, 0 deletions

diff --git a/Examples/Modules/ParticleBoundaryProcess/analysis_reflection.py b/Examples/Modules/ParticleBoundaryProcess/analysis_reflection.py
new file mode 100755
index 000000000..7dbb26206
--- /dev/null
+++ b/Examples/Modules/ParticleBoundaryProcess/analysis_reflection.py
@@ -0,0 +1,15 @@
+#! /usr/bin/env python
+
+# Copyright 2021 Modern Electron
+#
+# License: BSD-3-Clause-LBNL
+
+# This script just checks that the PICMI file executed successfully.
+# If it did there will be a plotfile for the final step.
+
+import yt
+
+plotfile = 'Python_particle_reflection_plt00010'
+ds = yt.load( plotfile )  # noqa
+
+assert True