Reply To: Tunnel Fire Case

[Kim Nam]

Rob, thanks to your help I finally finished the project. I still have some uncertainty about the setting operating density: 

1. For single phase imcompressible ideal gas, If I set the operating density to 1.00kg/m3 for example, the bouyancy induced by the density difference will be triggered if the density is changed from specified density? 

2. If I don't specify the operating density, what is the difference from the specifying the operating density? 

3. What's better option when the large density change is expected? Should I specify the operating density to the ambient air denstiy or should I leave operating density unspecitied.