Ansys Employee

Nope. Backflow defines what comes into a model if the flow conditions want to suck in rather than blow out of the meshed bit. I'm not sure why they're reporting flow in kmol/m2/h - that's a daft unit even for Americans! 

In Fluent we can set pressure and flow (mass/velocity) boundaries. Looking at the top image, what values do you know, so what options are there for each flow stream/boundary? Also consider whether a boundary is single or multiple phases when looking at it.