Three-dimensional Numerical Simulation of the Protective Effect of Tall Building on Short Building

Wu Meng; Tan Yongbo; Lin Yuhe; Wang Xuewen

doi:10.11898/1001-7313.20230610

Vol.34, NO.6, 2023

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Article Navigation > Journal of Applied Meteorological Science > 2023 > 34(6): 749-758

Wu Meng, Tan Yongbo, Lin Yuhe, et al. Three-dimensional numerical simulation of the protective effect of tall building on short building. J Appl Meteor Sci, 2023, 34(6): 749-758. DOI: 10.11898/1001-7313.20230610.

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Wu Meng, Tan Yongbo, Lin Yuhe, et al. Three-dimensional numerical simulation of the protective effect of tall building on short building. J Appl Meteor Sci, 2023, 34(6): 749-758. DOI: 10.11898/1001-7313.20230610.

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Three-dimensional Numerical Simulation of the Protective Effect of Tall Building on Short Building

DOI: 10.11898/1001-7313.20230610

Wu Meng^{1, 2},
Tan Yongbo^{1
,
,},
Lin Yuhe¹,
Wang Xuewen¹

1.
Emergency Management College, Nanjing University of Information Science and Technology, Nanjing 210044
2.
State Key Laboratory of Severe Weather & CMA Key Laboratory of Lightning, Chinese Academy of Meteorological Sciences, Beijing 100081

Received Date: 2023-09-20
Rev Recd Date: 2023-11-02
Publish Date: 2023-11-27

Abstract

Abstract

Tall buildings distort the electric field of the surrounding environment, resulting in a relatively strong electric field at top corners, which affects the lightning strike process, and the protection effect that short buildings receive from tall buildings varies with the distance between them. A three-dimensional fine-resolution lightning attachment model with multiple upward leaders (LAMM) is used to simulate protection effect of a tall building and a short building with different height and distance, with an isolated building set as a control group. Experimental results show that when there is a tall building with a short building in the space and two buildings are close to each other, the distortion range of the tall building almost completely contains the distortion range of the short building, the development of downward leader is completely affected by the tall building, and the shielding effect of the tall building on the short building is significant. With the increase of the building distance, the shielding effect of the tall building on the short building decreases exponentially. When tall building is 250 m high and the short building is 150 m high, probabilities of lightning strikes on short building with distance from 50 m to 600 m with interval of 50 m are 8.3%, 15.0%, 26.5%, 36.7%, 39.5%, 47.5%, 58.9%, 57.0%, 56.0%, 57.2%, 61.0%, and 62.5%. When there is a cut-off point where the increasing trend of the probability of lightning strikes on short buildings appears to slow down significantly, the probability of lightning strikes on short building differs from its probability of lightning strikes in isolation by only 3.6%. Comparing the lightning strike results for different building distance and isolated building, the difference in lightning strike results caused by the presence of tall building decreases from 44.5% to 22.7% when the horizontal distance between tall and short buildings is increased from 400 m to 600 m. Given the height of tall building, the probability of lightning strikes on short building with different heights follows a similar trend from a large increase to a flat increase with an inflection point. Corresponding to short building height from 50 m to 200 m, the horizontal distances reaching cut-off point are 300, 450, 550 m and 600 m, respectively. When two buildings are far separated, the effect of tall building on the probability of lightning strikes on short building is weaker, and it can be assumed that there is a state when tall building have no effect on the lightning attachment process.
- spatial morphology;
- electric field distortion;
- protective effect;
- numerical simulation;
- multiple upward leaders

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References(48)

Figures and Tables

Fig. 1 Schematic diagram of simulation area (a)two buildings,(b)isolated building

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图 2 模拟结果示意图

黑色长方体为建筑物，蓝线表示下行先导通道结构，红线表示上行先导通道结构, 下同

Fig. 2 Schematic diagram of simulation results

black rectangles are buildings, the blue line denotes downward leader channel structure, and the red line denotes upward lead channel structure, similarly hereinafter

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图 3 矮建筑物雷击概率

虚线为拟合曲线

Fig. 3 Probability of lightning strikes for short building

the dashed line denotes fitting curve

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Fig. 4 Lightning space development pattern with different distance between buildings

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Fig. 5 Distortion range of surrounding electric field for different horizontal distance between tall and short buildings

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图 6 不同高度矮建筑物的雷击概率

实线为对应雷击概率的拟合曲线

Fig. 6 Lightning strike probability for short building with different heights

solid lines denote fitted curves

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Table 1 Comparison of negative ground flash lightning strike for the same initial position

建筑物水平距离/m	闪电击中地面概率/%		闪电击中矮建筑物/%
建筑物水平距离/m	情形1	情形2	情形3	情形4
400	15.0	22.0	22.5	40.5
500	18.8	24.0	19.0	38.2
600	26.0	11.2	11.5	51.3

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References

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