How to have a no-slip condition for gas phase and a outflow condition for the solid?

MFiX How to
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#1

For on of my outlets, I want to have a no slip condition for the fluid or gas phase.

But I want to allow the solids to pass through this boundary.

THis is basically opposite of the ‘bc_po_apply_to_des = false’ condition in the advanced option section.

#2

This is not supported. What does that represent physically?

#3

Basically, I have a cyclone, and the solids should exit the bottom outlet, but the gas should remain within the bound and should not exit the bottom.

THis is because, in an actual cyclone, there is a bottom pressure that forms reversing the direction of the gas flow, and resutls in this vortex formation.

I wanted to mimic that