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[anshs]

I'm trying to model a packed bed gas absorption model. I'm using the Eulerian multiphase model with the species transport equation.

I have defined the materials as mixture materials, with material 1 = Air ( Oxygen + Nitrogen ) and material 2 = Carbon ( carbon_solid + product_solid ). Material 2 is the granular material and secondary phase.

With the heterogeneous reaction being  { Nitrogen + Carbon_solid = product_solid. } 

Problem: The solution runs well for normal fluidization bed, but as soon as I turn on the 'packed bed' option the solution diverges, especially the continuity equation diverges first.

I'm using: Drag model = syamlal-obrien-para ,  void fraction = 0.4 and min fluidization velocity = 0.06 m/s



Model: Bed zone = { volume fraction 0.6 Material 2 } and { 0.7 mass fraction species Carbon_solid. }