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added max splits #243

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Sep 27, 2023
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added max splits #243

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11 changes: 6 additions & 5 deletions tasks/task_13_variance_reduction/2_shielded_room_single_ww.ipynb
View file
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Original file line number Diff line number Diff line change
Expand Up @@ -410,14 +410,15 @@
"wwg = openmc.WeightWindowGenerator(\n",
" mesh=mesh, # this is the mesh that covers the geometry\n",
" energy_bounds=np.linspace(0.0, 2.5e6, 10), # 10 energy bins from 0 to max source energy\n",
" particle_type='neutron'\n",
" particle_type='neutron',\n",
")\n",
"\n",
"# The simulation with Weight Windows takes more time per particle because particles are splitting\n",
"# and take more time from birth to termination for the particle including all the split particles\n",
"# we are reducing the number of particles so this simulation takes a similar amount of time\n",
"# to the previous simulation that didn't use weight windows. So we can make a fair comparison\n",
"model.settings.particles = 4900\n",
"model.settings.max_splits = 1_000 # controls the maximum partile splits over the entire lifetime of the particle\n",
"model.settings.weight_window_generators = wwg"
]
},
Expand All @@ -444,9 +445,9 @@
"\n",
"t1 = time.time()\n",
"\n",
"print(f'total time without weight windows {int(t1-t0)}s')\n",
"print(f'total time with weight windows {int(t1-t0)}s')\n",
"\n",
"plot_mesh_tally(ww_statepoint_filename, 'no_ww.png')"
"plot_mesh_tally(ww_statepoint_filename, 'ww.png')"
]
},
{
Expand All @@ -467,7 +468,7 @@
{
"cell_type": "code",
"execution_count": null,
"id": "53fa1fce-f1b4-40b5-aa8f-fa58de32f65b",
"id": "09d8d704-75e5-4339-9ff0-da64ae79721c",
"metadata": {},
"outputs": [],
"source": []
Expand All @@ -489,7 +490,7 @@
"name": "python",
"nbconvert_exporter": "python",
"pygments_lexer": "ipython3",
"version": "3.10.12"
"version": "3.9.16"
}
},
"nbformat": 4,
Expand Down
23 changes: 5 additions & 18 deletions tasks/task_13_variance_reduction/3_sphere_iterative_per_run_ww.ipynb
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Original file line number Diff line number Diff line change
Expand Up @@ -142,7 +142,7 @@
"# all (100%) of source particles are 14MeV energy\n",
"energy = openmc.stats.Discrete([14e6], [1.0])\n",
"\n",
"source = openmc.Source(space=space, angle=angle, energy=energy)\n",
"source = openmc.IndependentSource(space=space, angle=angle, energy=energy)\n",
"source.particle = \"neutron\""
]
},
Expand All @@ -162,7 +162,7 @@
"metadata": {},
"outputs": [],
"source": [
"mesh = openmc.RegularMesh().from_domain(domain=my_geometry)\n",
"mesh = openmc.RegularMesh().from_domain(domain=my_geometry, dimension=[20,20,20])\n",
"\n",
"mesh_filter = openmc.MeshFilter(mesh)\n",
"\n",
Expand Down Expand Up @@ -199,6 +199,7 @@
"my_settings.source = source\n",
"my_settings.particles = 120\n",
"my_settings.batches = 10\n",
"my_settings.max_splits = 4000 # controls the total number of maximum splits a particle can do over the entire lifetime\n",
"\n",
"# no need to write the tallies.out file which saves space and time when large meshes are used\n",
"my_settings.output = {'tallies': False}"
Expand Down Expand Up @@ -329,7 +330,7 @@
" # wws.survival_ratio\n",
" # wws.max_lower_bound_ratio\n",
" # wws.weight_cutoff\n",
" # wws.max_splits\n",
" # wws.max_split # controls the total number of maximum splits a particle can do per mesh voxel\n",
"\n",
" # 5 iterations of weight window improvements\n",
" for i in range(5):\n",
Expand All @@ -356,20 +357,6 @@
" )"
]
},
{
"attachments": {},
"cell_type": "markdown",
"id": "e293ce43",
"metadata": {},
"source": []
},
{
"attachments": {},
"cell_type": "markdown",
"id": "79ec2340",
"metadata": {},
"source": []
},
{
"attachments": {},
"cell_type": "markdown",
Expand Down Expand Up @@ -444,7 +431,7 @@
"name": "python",
"nbconvert_exporter": "python",
"pygments_lexer": "ipython3",
"version": "3.10.12"
"version": "3.9.16"
}
},
"nbformat": 4,
Expand Down
6 changes: 4 additions & 2 deletions tasks/task_13_variance_reduction/4_sphere_iterative_per_batch_ww.ipynb
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Original file line number Diff line number Diff line change
Expand Up @@ -156,6 +156,8 @@
"my_settings.source = source\n",
"my_settings.particles = 50000\n",
"my_settings.batches = 5\n",
"my_settings.max_splits = 100 # controls the total number of maximum splits a particle can do over the entire lifetime\n",
"\n",
"# the mesh tallies produce large tallies.out files so this output setting avoids writing the tallies.out and saves time\n",
"my_settings.output = {'tallies': False}"
]
Expand Down Expand Up @@ -326,7 +328,7 @@
" # wws.survival_ratio\n",
" # wws.max_lower_bound_ratio\n",
" # wws.weight_cutoff\n",
" # wws.max_splits\n",
" # wws.max_split\n",
" \n",
" # gets a live pointer to the spectra tally that we will plot with each batch\n",
" spectra_tally = openmc.lib.tallies[outer_surface_spectra_tally.id]\n",
Expand Down Expand Up @@ -399,7 +401,7 @@
"name": "python",
"nbconvert_exporter": "python",
"pygments_lexer": "ipython3",
"version": "3.10.12"
"version": "3.9.16"
}
},
"nbformat": 4,
Expand Down
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