Vol.28, NO.2, 2017
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Article Navigation >  Journal of Applied Meteorological Science  > 2017  >  28(2): 227-236
Tan Yongbo, Zhang Xin, Xiang Chunyan, et al. Three-dimensional numerical simulation of side flash on buildings. J Appl Meteor Sci, 2017, 28(2): 227-236. DOI:  10.11898/1001-7313.20170210.
Citation: Tan Yongbo, Zhang Xin, Xiang Chunyan, et al. Three-dimensional numerical simulation of side flash on buildings. J Appl Meteor Sci, 2017, 28(2): 227-236. DOI:  10.11898/1001-7313.20170210.
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Three-dimensional Numerical Simulation of Side Flash on Buildings

DOI: 10.11898/1001-7313.20170210

  • Key Laboratory of Meteorological Disaster, Ministry of Education (KLME)/Joint International Research Laboratory of Climate and Environment Change (ILCEC)/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disaster (CIC-FEMD)/Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration, Nanjing University of Information Science & Technology, Nanjing 210044

  • Received Date: 2016-09-19
  • Rev Recd Date: 2017-01-11
  • Publish Date: 2017-03-31
    Abstract
  • Lightning is among the top ten kinds of natural disasters. Observations show that the connecting of downward leader and upward leader happen on the corner of tall buildings, a few take place on the side of buildings, but the damage of side flash shouldn't be ignored. As the side of the lightning protection is relatively weak, the side flash brings huge shock wave and strong electromagnetic radiation, causing great threat to buildings and human securities. Therefore, it is necessary to discuss processes and causes of side flash.On the basis of the existing leader developing random pattern of three-dimensional near-ground lightning, keeping other model settings unchanged, by changing initial potential of downward leader and geometrical property, many model studies on the development of occurrence of side flash are carried out, and statistics of the probability of side flash in various circumstances are performed. Results show that electric field strength of the top corner of the building is an important condition for the occurrence of side flash. When the downward leader is close to the building and below the height of the building, the value of electric field will reach the triggering threshold value, and the side flash is prone to take place. Moreover, initial potential of the downward leader and geometrical properties (height and width) of the building are important factors affecting the probability of side flash occurrence. When initial potential of the downward leader is between-9 MV and-3 MV, the probability of side flash increases at first and then decreases. When the initial potential of downward leader is-4.5 MV, the probability of side flash reaches a maximum. When the height of the building is between 50 m and 150 m, the probability of side flash increases at first and then decreases. When the height of the building is 100 m, the probability of side flash reaches a maximum. When the width of the building is between 30 m and 70 m, the probability of side flash decreases with the increase of the width. When the width of the building is 30 m, the probability of side flash reaches a maximum.These results are beneficial for the three-dimensional simulation of different connecting behavior and modifications of the electric field at the building corner, as well as the research on causes and influencing factors of side flash.
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    References(32)

  • Fig. 1  Diagram of three-dimensional simulation region

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    Fig. 2  Different connecting behavior on different grounding point (a) random parameter is 11, (b) random parameter is 9, (c) random parameter is 12, (d) random parameter is 68, (e) random parameter is 27

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    Fig. 3  Plot of potential distribution (unit: V)

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    Fig. 4  Modifications of the electric field at the building corner when the side flash appear (a) lightning strike to the corner, (b) lightning strike to the side

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    Fig. 5  The relation curve of initial potential of downward leader along with the effect of side flash

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    Fig. 6  Different connecting behaviors and modifications of the electric field at the building corner

    (a) when the initial potential is-3 MV, the different connecting behavior, (b) when the initial potential is-3 MV, modifications of the electric field on the building corner, (c) when the initial potential is-4.5 MV, the different connecting behavior, (d) when the initial potential is-4.5 MV, modifications of the electric field on the building corner, (e) when the initial potential is-8 MV, the different connecting behavior, (f) when the initial potential is-8 MV, modifications of the electric field on the building corner

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    Fig. 7  Probability and statistics of side flash under conditions of different height and width of tall buildings

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    Fig. 8  Modifications of the electric field at the building corner under the conditions of different height (a) and different width (b) of tall buildings

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    Table  1  Statistical results of stroke points

    位置 击中概率/%
    建筑物拐角 18
    建筑物侧边 45
    建筑物顶面 19
    建筑物侧面 7
    地面 11
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    • Received : 2016-09-19
    • Accepted : 2017-01-11
    • Published : 2017-03-31
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