Numerical Simulation of the Smoke Recirculation Behavior in Street Canyons with Different Aspect Ratios and Cross-Wind Conditions
Abstract
:1. Introduction
2. Modeling
2.1. Physical Model Configuration
2.2. Grid Sensitivity
3. Results and Discussion
3.1. Smoke Recirculation Behavior in Street Canyons
3.2. The Critical Smoke Recirculation Velocity for Different Street Canyon Conditions
3.3. Correlation of the Smoke Critical Recirculation Velocity for Different Street Canyon Aspect Ratio Conditions
4. Conclusions
- The smoke recirculation behavior inside the street canyon can be divided into two different regimes for different aspect ratio (n = H/W) conditions. The transition of smoke from the “fully recirculation stage” (smoke recirculation in the entire canyon) to the “semi recirculation stage” (smoke recirculation in the middle-upper part of the canyon) will take place when the aspect ratio of the street canyon is n = 1.
- For street canyons with higher buildings and narrower streets, the critical velocity for the presence of smoke recirculation is found to be lower; however, this critical velocity will increase with decreasing building height and increasing street width. The critical smoke recirculation velocity is found to be almost constant at 2.84 m/s when the aspect ratio of the street canyon is n = 1.
- A piecewise function with a distinguishing point at n = 1 is proposed for the normalized critical velocity Vc* (i.e., the critical velocity Vc upon the standard critical velocity for an ideal street canyon Vc,0). Within the “fully recirculation stage” and “semi recirculation stage”, the critical velocity decreases linearly with the increasing street canyon aspect ratio.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
References
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Test No. | Street Canyon Configurations (Length: L = 40 m) | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
W | H | ||||||||||
1–10 | 12 m | 9 m | 12 m | 15 m | 18 m | 21 m | 24 m | 27 m | 30 m | 33 m | 36 m |
n = H/W | 0.75 | 1.00 | 1.25 | 1.50 | 1.75 | 2.00 | 2.25 | 2.50 | 2.75 | 3.00 | |
11–20 | 15 m | 9 m | 12 m | 15 m | 18 m | 21 m | 24 m | 27 m | 30 m | 33 m | 36 m |
n = H/W | 0.60 | 0.80 | 1.00 | 1.20 | 1.40 | 1.60 | 1.80 | 2.00 | 2.20 | 2.40 | |
21–30 | 18 m | 9 m | 12 m | 15 m | 18 m | 21 m | 24 m | 27 m | 30 m | 33 m | 36 m |
n = H/W | 0.50 | 0.67 | 0.83 | 1.00 | 1.17 | 1.33 | 1.50 | 1.67 | 1.83 | 2.00 | |
31–40 | 21 m | 9 m | 12 m | 15 m | 18 m | 21 m | 24 m | 27 m | 30 m | 33 m | 36 m |
n = H/W | 0.43 | 0.57 | 0.71 | 0.86 | 1.00 | 1.14 | 1.29 | 1.43 | 1.57 | 1.71 | |
41–50 | 24 m | 9 m | 12 m | 15 m | 18 m | 21 m | 24 m | 27 m | 30 m | 33 m | 36 m |
n = H/W | 0.38 | 0.50 | 0.63 | 0.75 | 0.88 | 1.00 | 1.13 | 1.25 | 1.38 | 1.50 | |
Global condition | HRR: 5 MW; Ambient: 20 °C; Wind velocity: from 1.9–3.6 m/s, with intervals by 0.1 m/s |
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Xiang, Y.; Lu, K.; Wang, J.; Ding, Y.; Mao, S. Numerical Simulation of the Smoke Recirculation Behavior in Street Canyons with Different Aspect Ratios and Cross-Wind Conditions. Int. J. Environ. Res. Public Health 2022, 19, 7056. https://doi.org/10.3390/ijerph19127056
Xiang Y, Lu K, Wang J, Ding Y, Mao S. Numerical Simulation of the Smoke Recirculation Behavior in Street Canyons with Different Aspect Ratios and Cross-Wind Conditions. International Journal of Environmental Research and Public Health. 2022; 19(12):7056. https://doi.org/10.3390/ijerph19127056
Chicago/Turabian StyleXiang, Yanqing, Kaihua Lu, Jie Wang, Yanming Ding, and Shaohua Mao. 2022. "Numerical Simulation of the Smoke Recirculation Behavior in Street Canyons with Different Aspect Ratios and Cross-Wind Conditions" International Journal of Environmental Research and Public Health 19, no. 12: 7056. https://doi.org/10.3390/ijerph19127056