[Firdaus Abidin]

hi all, im using Fluent 17 to simulate a simple flocculation tank with baffle. im new to CFD in general.

im using population balance model because that is what i read others are using and the setting that i use are as follow:

multiphase- Eulerian with 2 eluerian phase and 1 discrete phase

viscous- k-epslon
-k-epslon model is realizable
-near wall treatment is scalable wall functions
-turbulence multiphase model is dispersed

discrete phase model- in the physical models i thick erosion/accretion and breakup
-i created injection with surface type. from the release from surfaces i chose inlet
-the material chosen is ash-solid
-in the point properties the stop time is 10s and the velocity is 0.01 m/s. the scale flow rate by face area and injection using face normal direction are chosen.

population balance model- method discrete
- the phases is water
- the nucleation rate, growth rate, aggregation and breakage all have a constant value of 0.1 and Ramakrishna is chosen for the formulation

boundary condition- at the inlet the water velocity 0.1, volume fraction 0.9, bin-0 fraction 0.1 and bin-1 fraction 0.3

- at the outlet, backflow volume fraction is 0, bin-0 fraction is 0.2 and bin-1 fraction 0.3

the solution initialization method use is hybrid.

when i run the calculation i get an error below:
Error: Divergence detected in AMG solver: bin-1-fraction
Error Object: #f

i already googled for solution but have not found any that works for my case.
i will appreciate it greatly if anyone can give me a suggestion on how to solve this problem.