Particle Tracing Module

Dear All,

I would like to ask about Particle tracing Module.

I have tried to simulate the deposition of particle in Accumulator.
I would like to observe the build-up boundary from particle deposition, but I can not get build-up boundary.

Q1: How can I simulate build-up boundary?
If you have some ideas or comments, please advice

Q2: Do the particle tracing module consider the particle as a point ?

Best Regards,
Yannapol S.