I am trying to simulate a transient 2D powder flow under the effects of gravity only, the geometry consists simply of a rectangular tube vertically placed in my domain, I'm using the multiphase eulerian model for the metallic powder, the tube is at atmospheric pressure at both ends. The problem is in the density of the powder, the real density which is 5500 kg/m3 causes fluent to diverge while a small density (1-10 kg/m3) doesn't cause any problems. I've tried to use a smaller mesh element and smaller time step but it didn't help. So I'm reffering to this community to see if anyone has any advice for my problem.

Thank you in advance!

ZAYNI Karim