Reply To: How to adjust it’s convergence or not ? Share topology, non-share topology+combine component ?

[Jamessmp23]

Hello all,

i'm trying to see the basic circulation flow pattern of airlift-bioreactor from the reference paper, I need to set the all parts of the reactor as share topology except the draft tube to see the gas holdup, gas and water velocity at the riser and downcomer.

For this steady state simulation, I used the euler-euler multiphase, k-epsilon realizable.
On material I set the primary phase as water and secondary phase as air with 0.005 m diameter.
I set the cell zone : draft tube as solid (stationary wall) and other parts are fluid, at boundary condition I only set the air inlet = 0.075 m/s.   
I used couple scheme, Least square cell based, third order MUSCL, Quick,third order MUSCL,third order MUSCL.
At control I set the flow courant number = 40. For the initialization I used Hybrid initialization and patch the air volume fraction as 0.2 at all parts except the draft tube section.

Do I set anything wrong or any suggestion for better fluent setup ?  

Regards,
James