HELP! Particles maximum number of events warning

[thallam]

Hello,

I am trying to create a certain geometry using csg and when plotting the geometry in openmc-plotter it looks correct even on my test cases. However, when I run a quick test case I get the warning particle underwent maximum number of events. The code is below. can anyone help?

Thanks
test.py (9.1 KB)

[Jarret]

Hi Thallam
I personally don’t like downloading and running python scripts from people I am unfamiliar with, if you could provide the code within text I would be able to take a look.
I would suggest running it in geometry debug mode if you haven’t, and also checking out the following support page,

Sharing a fix for Particle X underwent maximum number of events. (and wondering why it worked)

That definitely sounds like it could have been the issue. Have you read this support page from before? Every time the particle passes a boundary it would count as an interaction, so if you have a lot of boundaries stacked your reasoning makes sense that you would reach the max number of interactions (1 million) faster as it is passing 2 boundaries every time it changing cells. For the future I would just make sure you’re using the same surface for coinciding cells as this would prevent this i…

The person didn’t find a fix for his specific scenario but you might be able to for yours. It can be useful to try and track which particle it’s occurring with and evaluating it’s specific interactions to see where its interacting with or if it’s getting stuck.