Hi kkanade ,Jamessmp23abenhadj, all

I am new to fluent and I am having a difficult time getting the right circulation for my airlift reactor simulation. I have used a 2D geometry, the Euler-Euler multi-phase method, k-epsilon for turbulence. I set the inlet boundary condition as air velocity = 0.25 m/s and zero for water, volume fraction for air as 1. But it seem not to recirculate and has a very funny flow pattern. it won't go through the riser. I was finally able to get it to go through the riser using the eulerian model and setting the outlet to degassing, but still no re-circulation. 

Please help!