Flight of Urban Windborne Debris

在风暴期间，由风引起的碎片(屋顶瓦片、树枝)占损失的10%到30%。EPSRC之前的一个项目资助了一名博士生研究单个碎片https://doi.org/10.1016/j.jweia.2012.07.011.的自由飞行该项目旨在通过观察多种物品的飞行，在城市环境中和周围移动，在碎片损害链中发挥作用来扩大这一点。将结合风洞和计算流体动力学(CFD)建模。在前者中，多个屋顶瓦片将使用基于吸力的触发器从目标建筑中释放，并使用高速摄像机在城市环境中进行跟踪。CFD模拟将在相同的场景下运行，对碎片采用“智能”粒子跟踪，并在发射和撞击阶段使用覆盖网格。瞬时力和力矩系数将从前面的工作中得到。早期的项目已经开发了风中细长结构的风险模型(皇家学会IC170137)，并将其扩展到普通住宅(GCRF)。拟议的项目将使用碎片撞击位置和撞击能量的预测分布来扩展这一风险模型，以考虑风载碎片。

Windborne debris (roof tiles, branches) accounts for anywhere between 10 and 30% of the damage during windstorms. A previous EPSRC project funded a PhD student to look at the free flight of single items of debris https://doi.org/10.1016/j.jweia.2012.07.011. This project aims to extend that by looking at the flight of multiple items, moving in and around the urban environment, playing their part in the debris damage chain. A combination of wind tunnel and computational fluid dynamics (CFD) modelling will be utilised. In the former, multiple roof tiles will be released from a target building using a suction-based trigger and tracked using high speed cameras through an urban environment. CFD simulations will be run of the same scenario, employing "smart" particle tracking for the debris and overset meshes for the launch and impact phases. The instantaneous force and moment coefficients will be derived from the previous work. Earlier projects have developed a risk model for slender structures in wind (Royal Society IC170137) and extended it to vernacular housing (GCRF). The proposed project will use predicted distributions of debris impact position and impact energy to extend this risk model to account for wind borne debris.