# Particle trace function not working **URL:** \ **Category:** CAD Mode Support\ **Created:** [January 22, 2025, 8:06pm UTC](https://www.simscale.com/forum/t/particle-trace-function-not-working/99708 "2025-01-22T20:06:57Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![Owura](https://www.simscale.com/forum/letter_avatar/owura/32/5_5575768a8748004e209b776fc1b2916d.png) [@Owura](https://www.simscale.com/forum/u/Owura)\ **Post date:** [January 22, 2025, 8:06pm UTC](https://www.simscale.com/forum/t/particle-trace-function-not-working/99708/1 "2025-01-22T20:06:57Z")
When i select the particle trace function when processing my results, it is unsuccessful. There is no feedback. it keeps loading then nothing happens after loading. Unable to move on to select faces and the rest to view streamlines. ---
**Author:** ![igaviano](https://www.simscale.com/forum/user_avatar/www.simscale.com/igaviano/32/73967_2.png) [@igaviano](https://www.simscale.com/forum/u/igaviano)\ **Post date:** [January 22, 2025, 8:42pm UTC](https://www.simscale.com/forum/t/particle-trace-function-not-working/99708/2 "2025-01-22T20:42:31Z")
Hi @Owura, thanks for posting on the forum. Could you add a link to your project so we can take a closer look? Some screenshots would also help! This post offers a guideline on how to create a forum post: - **[Guide to Clear and Understandable Forum Posting](https://www.simscale.com/forum/t/guide-to-clear-and-understandable-forum-posting/99461)** In the meantime, make sure to check out this post-processing tutorial which goes into more detail on how to apply the Particle Trace filter: - **[Tutorial: Post-Processing Fluid Flow Simulations | SimScale](https://www.simscale.com/docs/tutorials/post-processing-fluid-flow-simulations/#particle-traces)** Cheers Igor ---
**Author:** ![Owura](https://www.simscale.com/forum/letter_avatar/owura/32/5_5575768a8748004e209b776fc1b2916d.png) [@Owura](https://www.simscale.com/forum/u/Owura)\ **Post date:** [January 22, 2025, 8:53pm UTC](https://www.simscale.com/forum/t/particle-trace-function-not-working/99708/3 "2025-01-22T20:53:40Z")
[Oil bath 2 | SimScale Workbench](https://www.simscale.com/workbench/?pid=304488945200565994&rru=ee3dfe69-06d9-4d8d-9632-fdcb44a5d5ab&ci=ae100c13-c9e8-424f-9f1b-72e6e84db644&mt=SIMULATION_RESULT&ct=SOLUTION_FIELD) ---
**Author:** ![Owura](https://www.simscale.com/forum/letter_avatar/owura/32/5_5575768a8748004e209b776fc1b2916d.png) [@Owura](https://www.simscale.com/forum/u/Owura)\ **Post date:** [January 27, 2025, 4:09pm UTC](https://www.simscale.com/forum/t/particle-trace-function-not-working/99708/4 "2025-01-27T16:09:59Z")
Hi following up on this ---
**Author:** ![igaviano](https://www.simscale.com/forum/user_avatar/www.simscale.com/igaviano/32/73967_2.png) [@igaviano](https://www.simscale.com/forum/u/igaviano)\ **Post date:** [January 28, 2025, 10:35pm UTC](https://www.simscale.com/forum/t/particle-trace-function-not-working/99708/5 "2025-01-28T22:35:12Z")
Hi @Owura, I’ve just opened your project and the Particle Tracing filter seems to be working fine from my perspective: ![image](https://www.simscale.com/forum/uploads/default/original/3X/2/2/228947cf49115a10083c73570c0a65625d182a33.jpeg) Keep in mind you can’t select the outer face for the filter since you have a velocity inlet on the inner one: ![image](https://www.simscale.com/forum/uploads/default/original/3X/b/5/b510690d40117631abbe6beed7121be049b31e5e.png) As a sidenote, your simulation results will naturally take a long time to load since you have 50M cells in your domain. We would strongly advise you to reduce your mesh’s sizing to enhance simulation efficiency and core hours consumption. Cheers ---
**Author:** ![Owura](https://www.simscale.com/forum/letter_avatar/owura/32/5_5575768a8748004e209b776fc1b2916d.png) [@Owura](https://www.simscale.com/forum/u/Owura)\ **Post date:** [February 4, 2025, 3:38pm UTC](https://www.simscale.com/forum/t/particle-trace-function-not-working/99708/6 "2025-02-04T15:38:02Z")
what would you recommend i reduce the mesh size to? ---
**Author:** ![igaviano](https://www.simscale.com/forum/user_avatar/www.simscale.com/igaviano/32/73967_2.png) [@igaviano](https://www.simscale.com/forum/u/igaviano)\ **Post date:** [February 5, 2025, 10:06pm UTC](https://www.simscale.com/forum/t/particle-trace-function-not-working/99708/7 "2025-02-05T22:06:10Z")
Hi @Owura, this would be up to your evaluation. Clean up your model so that you only leave the necessary details and adjust the cell size so that you have a good balance between resolution and the mesh’s size. A mesh with more than 3M cells is already considered large and I would say going above 8M cells should be too much for most applications.