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.
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