I use MPM to create particles because of the size of the particles.

According to Ansys Fluent User's Guide (Ref,, MPM is used when the total particle volume is significant within the flow domain volume.

I did not use a traditional Lagrangian discrete phase model (DPM and DEM) because it is applied when particle sizes are small enough to be regarded as point masses within a single cell.

In my case, I need to create a real volume of particles inside a domain. That is the main reason why I use an MPM.