Route to simulate a circulated leaching column

MFiX
#1

Hi,
I am going to simulate a leaching system where the solutions will be collected and reinject to the system.
The solutions keep passing the particle bed in a column with species exchange between the fluid and solid phase. The outlet fluid will be collected to reject into the column.
Since the species concentration changes each time, I need to continuously change the fluid inlet property and mock them to the fluid outlet surface.

Any suggestions to simulate this process in the MFIX platform.

Request for Assistance with Circulating Fluidized Bed Reactor Simulation in MFIX
#2

I can set the Y dircetion as the cyclic. However, this operation also let the particles cirulate the domain, which is not satisfied with real operation.
I also noted that by setting the bc_po/mi_ to_des as flase the solid phase can be detained in the domain.
The problem is that i can not build the po or mi plane in the Y direction.