# Simulation Freezing

**URL:** <https://openmc.discourse.group/t/simulation-freezing/4082>\
**Category:** User Support\
**Created:** [March 25, 2024, 11:27am UTC](https://openmc.discourse.group/t/simulation-freezing/4082 "2024-03-25T11:27:44Z")\
**Posts on this page:** 1\
**Showing post:** 3

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**Author:** ![OtkjBR](https://yyz2.discourse-cdn.com/free1/user_avatar/openmc.discourse.group/otkjbr/32/3013_2.png) [@OtkjBR](https://openmc.discourse.group/u/OtkjBR)\
**Post date:** [April 1, 2024, 10:29pm UTC](https://openmc.discourse.group/t/simulation-freezing/4082/3 "2024-04-01T22:29:14Z")

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I do use mesh filters, but I needed a larger number of particles anyways.  
What helped me was changing the estimator: tally.estimator = ‘collision’. You can find more information in this [post](https://openmc.discourse.group/t/particle-lost-without-warning-error-or-being-killed-stalling-the-run/3098/2).  
Thank you for your help!

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