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Unreasonable particle trajectories and invalid wall condition
Posted Nov 25, 2025, 9:59 p.m. EST Charged Particle Tracing Version 6.3 1 Reply
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Hello there,
I encountered some issues while using the charged particle tracing module in COMSOL. I have completed the simulation and obtained the particle trajectories. But some particles don't look very reasonable. A portion of the particles collided with my metal electrode and passed through it, but the surface of electrode was set with the wall condition "Disappear." I used a finer mesh and smaller time steps, but the situation did not improve. What method can be used to solve this problem?
Thank you all in advance.
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Hi Yihang,
The time stepping may be the issue. You may need to set strict or manual time stepping in the respective solver node, not only in the study step node. The setting in the study step node defines at what times a solution is stored, while the solver may choose much larger time steps if its time stepping is left free. This way the solver may miss wall impacts.
Cheers Edgar
-------------------Edgar J. Kaiser
emPhys Physical Technology
www.emphys.com
