Prashanth
Ansys Employee

Hi,

So, you have a cylindrical zone and you are trapping the DPM particles on it. When a DPM particle gets trapped, you would want that "cell boundary" to get modified into a wall. I don't think it can be done, but you can take a look at the Fluent DPM UDF manual for more clarity/a workaround.

You can also take a look at Lagrangian wall film model and check if it can be used for your application.