Restitution coefficient (kinetic theory)
 

Can you suggest where is setup of set the restitution coefficient?

I have some message in pre CFX
"In Analysis 'Flow Analysis 1' - Domain 'Pipes': If kinetic theory is active for fluid 'qua1', then the restitution coefficient must also be set."

in your fluid domain when you create materials then for solid particle select dispersed solid it will automatically show you the tab for restitution coefficient.