# particle tracer - disappearing after time step 1

**URL:** https://discourse.paraview.org/t/particle-tracer-disappearing-after-time-step-1/16412
**Category:** ParaView Support
**Created:** [April 1, 2025, 2:07pm UTC](https://discourse.paraview.org/t/particle-tracer-disappearing-after-time-step-1/16412 "2025-04-01T14:07:39Z")
**Posts on this page:** 1
**Showing post:** 3

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### Author: ![Nikolas\_Kare](https://discourse.paraview.org/user_avatar/discourse.paraview.org/nikolas_kare/32/16253_2.png) [@Nikolas\_Kare](https://discourse.paraview.org/u/Nikolas_Kare)
#### Post date: [April 3, 2025, 2:40pm UTC](https://discourse.paraview.org/t/particle-tracer-disappearing-after-time-step-1/16412/3 "2025-04-03T14:40:52Z")

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Hi Mathieu,

Thank you! This actually worked!

Does this mean that the scaling factor of the velocity should correspond to the physical time-stepping between the flow shots? And second, when calculating the particle age, should the velocity scaling factor be added back?

Kind regards,

Nikolas

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