How to specify a BC that only allows the fluid through but not the solid?

MFiX
#1

I’m trying to specify a boundary condition with mass outflow, but I only want to fluid to flow out while retaining all the particles. How can this be implemented please?

#2

What is your outlet boundary condition? You can try bc_po_apply_to_des (bc) = .false.

bc_po_apply
bc_po_apply1676×688 85.3 KB

#3

Thank you for the quick reply. I found exactly what you have in the screenshot, but am not able to edit it - can you further advise?

My other BCs are mass inlet and pressure outlet. The BC that I’d like to restrict mass outflow of solid is a ‘porous wall’.
Untitled

#4

Please clean the output files first in your project folder and then edit it (reset and start a new run).

You can also open the .mfix file and mannully add one line: bc_po_apply_to_des(3) = .False.

step1
step11673×962 81.6 KB
step2
step21843×961 86.2 KB

step3
step31674×840 117 KB

#5

Thank you very much!!!