Study on gas dispersion with high temperature around isolated cubic building

In this study, considering the importance of environmental impact evaluation of exhaust gas with high temperature and high-concentration hazardous pollutants from emergency generators in the urban environment, wind tunnel experiment and steady RANS simulation on high-temperature gas dispersion around isolated cubic building were conducted. Experiments were conducted under different gas density, exhaust speed ratio and wind directions to clarify their influence on pollutant dilution. Light gas was used to reproduce the same buoyancy with high temperature gas. We found that high buoyancy in the light gas and large exhaust momentum can prevent pollutant from getting trapped within the recirculation zone behind the building, resulting in a lower mean concentration. Also, changing wind direction made the concentration distribution become asymmetric. In addition, the accuracy of steady RANS using weakly compressible model was validated.