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<p>Urban wind hazards around high-rise buildings arise from intricate interactions between atmospheric flow and urban morphology, yet the role of coherent vortical structures in these processes remains insufficiently understood. While previous studies have mainly focused on direct building-induced flow modifications, limited attention has been given to the height-dependent coupling between vortices and downward momentum transport. This study explores typhoon-induced wind hazards by simulating Typhoon Mangkhut (2018) over SEG Plaza in Shenzhen using the coupled Weather Research and Forecasting (WRF) model and the Parallelized Large-Eddy Simulation Model (PALM). The results reveal that tall, dense urban blocks facilitate the formation of vertically-expanding coherent vortices. Notably, a height-dependent interaction between these vortices and downward momentum flux becomes most prominent in the mid-canopy layer (normalized height: 0.4–0.6). This contributes to momentum transport, gust, and wind pressure, collectively forming a “zone of hazards” along the façades of tall buildings. The findings provide critical insights for urban wind safety and high-rise building resilience strategies.</p>

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Numerical Simulations of the Impacts of Coherent Vortices on Wind Hazards in Urban Blocks

  • 期刊论文

  • 发表日期：

    2025年8月23日

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  • Dahu Yang,
  • Ning Zhang,
  • Zongxu Qiu,
  • Honglong Yang,
  • Jie Tang

摘要

Urban wind hazards around high-rise buildings arise from intricate interactions between atmospheric flow and urban morphology, yet the role of coherent vortical structures in these processes remains insufficiently understood. While previous studies have mainly focused on direct building-induced flow modifications, limited attention has been given to the height-dependent coupling between vortices and downward momentum transport. This study explores typhoon-induced wind hazards by simulating Typhoon Mangkhut (2018) over SEG Plaza in Shenzhen using the coupled Weather Research and Forecasting (WRF) model and the Parallelized Large-Eddy Simulation Model (PALM). The results reveal that tall, dense urban blocks facilitate the formation of vertically-expanding coherent vortices. Notably, a height-dependent interaction between these vortices and downward momentum flux becomes most prominent in the mid-canopy layer (normalized height: 0.4–0.6). This contributes to momentum transport, gust, and wind pressure, collectively forming a “zone of hazards” along the façades of tall buildings. The findings provide critical insights for urban wind safety and high-rise building resilience strategies.