DEM runs are expensive. Do you require to have the flow resolved? If not switch off flow and run pure particles!

Thanks for replaying, actually, because of the periodic boundary condition, I solved the continuous phase as first with periodic boundary condition and specified air mass flow as of zero Kg/s, in another word I switch off the air flow and then I have run the DPM phase as next as pure particle, but it still very longs time Iteration. I really surprised, because algorithmically, it should not be a problem, the particle dynamics to simulate 300 particles on a CPU.nRegardsnn