Nikhil Narale
Ansys Employee

Hello,

While using DPM, It is recommended that the fraction of the volume occupied by the discrete phase in a cell should be less than 10-12% of the cell volume. This is applicable globally as well. 

Refer the section 20.1.2.1 in the user's guide: https://ansyshelp.ansys.com/account/secured?returnurl=/Views/Secured/corp/v222/en/flu_ug/flu_ug_sec_discrete_over.html

If you are not able to access the link, please refer to this forum discussion: https://forum.ansys.com/forums/topic/using-help-with-links/#latest

Nikhil