[owdladben]

Hi everyone, I originally posted this on the Ansys forum however my thread got no traction so thought I'd try it here. I'm trying to use the Boussinesq approximation to model buoyancy driven flow in a classroom however I'm struggling, even after reading the user guide.

I'm trying to model the effect a radiator would have on the spread of a tracer gas within a classroom. I have two case studies I want to look at.

Case Study 1: Room Initialised at 20C, Radiator On with constant Temp 30C, Inlet Ventilation Temp 5.2C, Inlet Tracer Gas Temp 37C

Case Study 2: Room Initialised at 20C, Radiator Off, Inlet Ventilation Temp 15.3C, Inlet Tracer Gas Temp 37C

Some of the assumptions I've made is there is no heat flux from the pupils, walls are insulated (heat flux = 0)...

For these case studies, what is my operating temperature? Also for my material density (air) that I have changed from constant to boussinesq , do I need to change the constant value for density? I noticed when I switched to Boussinesq it went to 0 so I just set this to 1.204kg/m3.

For clarity with my study, the tracer gas inlet is 0.7l/s (peak breathing flow rate) while the velocity inlet flow rate is 270l/s

Apologies if this is basic stuff, I'm new to Fluent!

Thanks, Ben.