建筑物顶端几何特征对上行先导起始影响的3D模拟
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P404

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国家自然科学基金(42205078);江苏省基础研究计划(自然科学基金)青年基金(BK20190147);江苏省高等学校自然科学研究面上项目(21KJB170007和22KJB170021);灾害天气国家重点实验室开放课题(2021LASW-B04);2021年山东自然科学青年基金(ZR2021QD023);无锡学院自然科学基金重点项目(2019bjynk005);江苏省双创博士项目(JSSCBS20210861)


3D simulation research on the effect of geometric characteristics of building tip on the initiation of upward leader
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    摘要:

    建筑物几何特征对上行先导始发具有重要影响,本文基于三维变网格雷击物理模型,在不同几何特征建筑物和不同雷电流峰值情况下,探讨了下行负地闪过程中,建筑物顶部上行正先导始发影响因素。除了发现建筑物高度对先导的始发具有促进作用外,还得到以下结论:1)雷电流峰值相同时,建筑物的高度越高,其几何形状对上行稳定先导起始的影响(η)就越小。建筑物高度相同时,雷电流峰值越大,η 越小;2)圆柱塔型尖端的上行稳定先导最容易起始,且最接近针型,η 最小,为12.2%。长方体型上的稳定先导起始最晚,η 最大,可达53.4%;3)对于高度较矮和雷电流峰值较小的情况下,尖端几何形状(塔型或斜坡)对先导起始的影响较明显。

    Abstract:

    The geometric characteristics of the building have an important effect on the initiation of the upward leader. Based on a three-dimensional variable grid physical lightning model, in the case of buildings with different geometric characteristics and the peak current of the lightning strike (IP), the influence factors of upward positive leader initiation at the tip of buildings during the development of downward negative cloud-to-ground flash is discussed. In addition to finding that, the height of the building has a promoting effect on the initiation of the leader. The following conclusions have obtained: 1) for the same IP, the taller the building, the smaller the difference (η) of its geometric on the leader initiation; for the buildings of the same height, as IP increases, the η becomes smaller. 2) The stable leader at the tip of the cylindrical tower type is the easiest to initiate and the closest to the needle, the smallest η have reached at 12.2%. The stable leader at tip of the cuboid type is the latest to initiates, the largest η have reached at 53.4%. 3) For the case of short building and weaker IP, the geometric characteristics of tip (tower or slope) has a significant effect on the leader initiation.

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郭秀峰,高玥,章玲,等. 建筑物顶端几何特征对上行先导起始影响的3D模拟[J]. 科学技术与工程, 2024, 24(15): 6154-6163.
Guoxiufeng, Gaoyue, Zhangling, et al.3D simulation research on the effect of geometric characteristics of building tip on the initiation of upward leader[J]. Science Technology and Engineering,2024,24(15):6154-6163.

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  • 收稿日期:2023-07-02
  • 最后修改日期:2024-05-22
  • 录用日期:2023-10-26
  • 在线发布日期: 2024-06-04
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