I have problem with the lattice. when i try to run the code with 200 particles, it works. however when i set it to 20000 or 50000 then it is error and could not located the particle. how do i fix it ?
Hi Azlan, welcome to the openmc community.
I think you have some undefined regions or some overlaps between your cells. You can use the geometry debug feature of openmc to check this openmc.run(geometry_debug=True) from your script or openmc -g in terminal
Hope it could localize the problem with openmc.
I have and it says it is overlapping. However when i visualize it, it is not
Pada Jum, 21 Mar 2025, 19.55, Wahid via OpenMC <notifications@openmc.discoursemail.com> menulis:
Sometimes, we can’t see that visually from openmc plot, but since the geometry debug feature reports which cells are overlapped, you can check those cells. Sometimes, it was just a small error, the wrong surface being assigned, and so on.
Hello @Azlan846,
the Geometry class have remove_redundant_surfaces() method to reduce the number of multiple surface definition with similar construction. You may want to use it, aside of debugging the geometry.
Also beware of putting the vaccum-boundary, there should be some distance between a material which produce neutron source and the vacuum-boundary, so the system can track neutrons properly (I think).