[kongl1986]

I am simulating gas solid flow for euler euler model in 10m circulating fluidized bed.
When I using a 18000cells mesh ,it converged well. and i can get the final solution about 12s flow time.
After refined it to 36000 and 54000 cells mesh, there is a converge problem.
the refined mesh only got converge before 4m or 2m from the inlet of bed, after that, the values monitored in rest of bed are keeping fluctuating when the flow time is more than 30s, although each time step shows that it converged.

The time step i am using is 0.0001s, the absolute criteria is 0.0001

can any one help me, thank you