Different buoyancy settings for multiphase flow
 

I'm trying to model an elevated pipe network with multiphase flow, For starters I added two fluids: a dispersed fluid (air) and a continues fluid (water) and I'm trying to give each fluid a distinctive buoyancy state, Is that possible? I'm currently stuck at giving both fluids the same buoyancy properties (density, etc.)

I've attached a screenshot of my current setup.

There are many examples in the CFX tutorial manual of how to do air/water multiphase models. I recommend you have a look at them.