Reset particle coordinates in neighbor_list_find_cell

src/geometry.cpp

@@ -247,6 +247,12 @@ find_cell_inner(Particle& p, const NeighborList* neighbor_list)
 
 bool neighbor_list_find_cell(Particle& p)
 {
+
+  // Reset all the deeper coordinate levels.
+  for (int i = p.n_coord_; i < p.coord_.size(); i++) {
+    p.coord_[i].reset();
+  }
+
   // Get the cell this particle was in previously.
   auto coord_lvl = p.n_coord_ - 1;
   auto i_cell = p.coord_[coord_lvl].cell;

tests/regression_tests/adj_cell_rotation/inputs_true.dat

@@ -0,0 +1,38 @@
+<?xml version='1.0' encoding='utf-8'?>
+<geometry>
+  <cell id="1" material="1" region="-1" universe="1" />
+  <cell id="2" material="2" region="1" universe="1" />
+  <cell fill="1" id="3" region="2 -3 4 -5 6 -8" rotation="10 20 30" universe="2" />
+  <cell fill="1" id="4" region="2 -3 4 -5 8 -7" translation="0 0 15" universe="2" />
+  <surface coeffs="1.0 0.0 0.0 5.0" id="1" type="sphere" />
+  <surface boundary="vacuum" coeffs="-7.5" id="2" name="minimum x" type="x-plane" />
+  <surface boundary="vacuum" coeffs="7.5" id="3" name="maximum x" type="x-plane" />
+  <surface boundary="vacuum" coeffs="-7.5" id="4" name="minimum y" type="y-plane" />
+  <surface boundary="vacuum" coeffs="7.5" id="5" name="maximum y" type="y-plane" />
+  <surface boundary="vacuum" coeffs="-7.5" id="6" type="z-plane" />
+  <surface boundary="vacuum" coeffs="22.5" id="7" type="z-plane" />
+  <surface coeffs="7.5" id="8" type="z-plane" />
+</geometry>
+<?xml version='1.0' encoding='utf-8'?>
+<materials>
+  <material depletable="true" id="1">
+    <density units="g/cc" value="10.0" />
+    <nuclide ao="1.0" name="U235" />
+  </material>
+  <material id="2">
+    <density units="g/cc" value="0.1" />
+    <nuclide ao="0.1" name="H1" />
+  </material>
+</materials>
+<?xml version='1.0' encoding='utf-8'?>
+<settings>
+  <run_mode>eigenvalue</run_mode>
+  <particles>10000</particles>
+  <batches>10</batches>
+  <inactive>5</inactive>
+  <source strength="1.0">
+    <space type="box">
+      <parameters>-4.0 -4.0 -4.0 4.0 4.0 4.0</parameters>
+    </space>
+  </source>
+</settings>

tests/regression_tests/adj_cell_rotation/results_true.dat

@@ -0,0 +1,2 @@
+k-combined:
+4.453328E-01 5.918369E-03

tests/regression_tests/adj_cell_rotation/test.py

@@ -0,0 +1,50 @@
+import pytest
+import openmc
+
+from tests.testing_harness import PyAPITestHarness
+
+
+@pytest.fixture
+def model():
+    model = openmc.model.Model()
+
+    fuel = openmc.Material()
+    fuel.set_density('g/cc', 10.0)
+    fuel.add_nuclide('U235', 1.0)
+
+    h1 = openmc.Material()
+    h1.set_density('g/cc', 0.1)
+    h1.add_nuclide('H1', 0.1)
+
+    inner_sphere = openmc.Sphere(x0=1.0, r=5.0)
+
+    fuel_cell = openmc.Cell(fill=fuel, region=-inner_sphere)
+    hydrogen_cell = openmc.Cell(fill=h1, region=+inner_sphere)
+    univ = openmc.Universe(cells=[fuel_cell, hydrogen_cell])
+
+    # Create one cell on top of the other. Only one
+    # has a rotation
+    box = openmc.rectangular_prism(15., 15., 'z', boundary_type='vacuum')
+    lower_z = openmc.ZPlane(-7.5, boundary_type='vacuum')
+    upper_z = openmc.ZPlane(22.5, boundary_type='vacuum')
+    middle_z = openmc.ZPlane(7.5)
+
+    lower_cell = openmc.Cell(fill=univ, region=box & +lower_z & -middle_z)
+    lower_cell.rotation = (10, 20, 30)
+    upper_cell = openmc.Cell(fill=univ, region=box & +middle_z & -upper_z)
+    upper_cell.translation = (0, 0, 15)
+
+    model.geometry = openmc.Geometry(root=[lower_cell, upper_cell])
+
+    model.settings.particles = 10000
+    model.settings.inactive = 5
+    model.settings.batches = 10
+    source_box = openmc.stats.Box((-4., -4., -4.), (4., 4., 4.))
+    model.settings.source = openmc.Source(space=source_box)
+
+    return model
+
+
+def test_rotation(model):
+    harness = PyAPITestHarness('statepoint.10.h5', model)
+    harness.main()