[bahman]

Hi all friends
I want to modeling steady state two-phase flow of liquid - solid using Eulerian-Granular approach in Fluent but when I do it,I receive Reverse flow in pressure inlet and outlet message (my BCs are pressure inlet&outlet) and solution isn't converge.
A two-dimensional (2-D) axisymmetric model was created and meshed with Gambit as shown in attach picture.
multiphase particulate (volume fraction= 0.2) fluid was pumped into the main model inlet (with pressure inlet=13.8Mpa), and mingled with multiphase particulate (volume fraction = 0.8) fluid was pushed from the bottom inlet(pressure inlet=13.8Mpa) then flow to outlet(pressure outlet=10.3Mpa).
I've tried both steady and unsteady state with different URF but solution isn't converge.
particle diameter:45e-6 m
particle density:2350 kg/m3
fluid density:1000 kg/m3
solid fluid interaction:syamlal o'brien
Assuming a wall boundary instead of the porous medium and drill string/pipe is wall BC in domain.
please guide me
Regards