Unexpected bouncing in closed packing

Submitted by rahulsoni on Fri, 10/25/2013 - 15:12

I am attempting to run drum mixing simulation of packed granular bed. The trial outputs in two cases of simple cubic and HCP packing are attached with the link below:

Even after trying several combination of properties I am getting similar undesired bouncing of particles. At the prima facie it appears to be caused by the force between the drum wall and particles nearby it.

Anyone please help how can I get rid of that.