Abstract Urban winds can cause a risk to pedestrian safety if not properly assessed. High-rise buildings produce a complex flow field at ground level, where regions of accelerated and recirculating flows are present. Gust wind speeds provide an indication of the maximal speed pedestrian might experience due to the unsteady flow. In this study, low- and high-fidelity numerical and experimental techniques to predict pedestrian level winds are tested on a realistic full-scale test-route at the University of Birmingham Campus during a storm event. Results show that it is beneficial to increase the complexity of simulations as a direct correspondence exists between the gust wind speed and the turbulent environment. While not much gain is achieved switching from Irwin Probes to hot-wire anemometry, LES greatly outperforms RANS and challenges experimental simulations in terms of reliability. The validity of the peak factor is also questioned and a general comment on the adequacy of each technique is discussed.

中文翻译：

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城市风下行人遇险评估研究

摘要 如果评估不当，城市风会对行人安全造成风险。高层建筑在地面产生复杂的流场，其中存在加速流和再循环流区域。阵风风速提供了行人可能由于不稳定流动而经历的最大速度的指示。在这项研究中，在暴风雨事件期间，在伯明翰大学校园的真实全尺寸测试路线上测试了用于预测行人水平风的低保真度和高保真度数值和实验技术。结果表明，由于阵风风速和湍流环境之间存在直接对应关系，因此增加模拟的复杂性是有益的。虽然从 Irwin Probes 切换到热线风速测量法并没有获得多少收益，LES 大大优于 RANS，并在可靠性方面挑战了实验模拟。峰值因子的有效性也受到质疑，并讨论了对每种技术的充分性的一般评论。