Fluidized Bed: Error: Divergence detected in AMG solver: pressure correction Error Ob
Hey,
i am trying to simulate a solidgas fluidized bed by using a UDF for Drag coefficent. If i simulate with syamlal for drag coefficient there is no problem. But if i use a UDF i allways get the following error: reversed flow in 28 faces on pressureoutlet 3. # Divergence detected in AMG solver: mpxmomentum > Decreasing coarsening group size! # Divergence detected in AMG solver: mpxmomentum > Increasing relaxation sweeps! # Divergence detected in AMG solver: pressure correction > Turning off correction scaling! # Divergence detected in AMG solver: pressure correction > Increasing relaxation sweeps! Error: Divergence detected in AMG solver: pressure correction Error Object: #f I have no idea how to fix this problem, i allready tried to lower the underrelaxation factors, but this didn't work. Maybe somebody can help me? Best regards 
hey hi
i am having the same problem of Divergence detected in AMG solver: pressure correction while i am using udf for radial distribution in fluidised bed reactor,but custom drag function is working well. did u find out the solution to this problem ....if u have then kindly reply ... 
Hi everyone
I am simulating gassolid fluidized bed, but there is reversed flow in pressureoutlet boundary and finally the solution does not converge. I wonder if u model transient flow, which kind of time stepping u used, and what the order of magnitude your timestep is. in several papers i saw they used adaptive time stepping which can't be used in Eulerian multiphase model.. 
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Fluidized bed for cooling tower
I am working on FB for cooling tower i am also getting same error could you please tell me if u have resolved the problem and also can anyone tell me how to give a water spray inside the Fluidized Bed

set the time step 1E5, and under relaxation factor for all variables 0.2.

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