Numerical Simulation of the Smoke Recirculation Behavior in Street Canyons with Different Aspect Ratios and Cross-Wind Conditions

Yanqing Xiang, Kaihua Lu, Jie Wang, Yanming Ding and Shaohua Mao
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Yanqing Xiang: Faculty of Engineering, China University of Geosciences Wuhan, Lumo Road 388, Wuhan 430074, China
Kaihua Lu: Faculty of Engineering, China University of Geosciences Wuhan, Lumo Road 388, Wuhan 430074, China
Jie Wang: School of Resource and Environmental Engineering, Wuhan University of Science and Technology, Heping Avenue 947, Wuhan 430081, China
Yanming Ding: Faculty of Engineering, China University of Geosciences Wuhan, Lumo Road 388, Wuhan 430074, China
Shaohua Mao: Faculty of Engineering, China University of Geosciences Wuhan, Lumo Road 388, Wuhan 430074, China

IJERPH, 2022, vol. 19, issue 12, 1-12

Abstract: This study investigated smoke dispersion inside a street canyon in a series of numerical simulations. The building height and street width as well as the cross-wind velocity were changed during the simulation, and the smoke recirculation behavior inside the canyon is presented and discussed. The results show that the smoke recirculation behavior could be distinguished into two different stages, i.e., the “fully recirculation stage” and “semi recirculation stage”, which is strongly determined by the canyon aspect ratio (the building height divided by street width). It was found that the critical wind velocity at which the smoke recirculation would take place was almost constant for an ideal street canyon with an aspect ratio of 1; however, this velocity was decreased with increasing building height or decreasing street width, indicating a much more dangerous circumstance when the aspect ratio is greater. Finally, a new piecewise function is proposed for the critical smoke recirculation velocity for all cases, which can provide some theoretical basis for building designs and emergency rescue for human beings inside the street canyon.

Keywords: smoke dispersion; street canyon; aspect ratio; critical recirculation velocity; cross-wind (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2022
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