Department of Engineering Physics, Tsinghua University, Institute of Public Safety Research, Beijing, China.
Beijing Key Laboratory of City Integrated Emergency Response Science, Tsinghua University, Beijing, China.
Indoor Air. 2022 Sep;32(9):e13119. doi: 10.1111/ina.13119.
The multi-person movement might cause complex induced airflow and affect the virus-laden expiratory droplet transmission in indoor environments. Using the dynamic mesh model in computational fluid dynamics, the multi-person movement with different personnel location distributions was realized. The induced airflow patterns, virus-laden droplet dispersion, and concentration distribution were investigated in detail. The results show that multi-person movement might intensify inter-regional convection, which has been rarely found in single-person movement conditions. Side-by-side distribution and ladder distribution of moving persons could cause a connected low-pressure area behind the moving persons, which might enhance lateral virus transport, especially where droplets might suspend at the height of the breathing zone. Not only 1-10 μm aerosols but also some 20-50 μm droplets are carried by the multi-person movement-induced airflow to over 3 m. Since the width of induced airflow is about 0.6-1.0 m, moving persons should keep enough horizontal distance (>1.0 m) to limit the air mixing and virus-laden droplet transmission. This paper could provide a detailed reference for the numerical study of multi-person movement-induced airflow patterns, droplet dispersion, and indoor infection control.
多人运动可能会引起复杂的诱导气流，并影响室内环境中携带病毒的飞沫传播。本文使用计算流体动力学中的动网格模型，实现了不同人员位置分布的多人运动。详细研究了诱导气流模式、带病毒飞沫的扩散和浓度分布。结果表明，多人运动可能会加剧区域间的对流，而这种对流在单人运动条件下很少见。移动人员的并排分布和梯级分布可能会在移动人员的后方形成一个连通的低压区，这可能会增强横向病毒的输送，特别是在飞沫可能停留在呼吸区高度的地方。不仅 1-10μm 的气溶胶，而且一些 20-50μm 的飞沫也会被多人运动引起的气流携带到 3m 以上。由于诱导气流的宽度约为 0.6-1.0m，移动人员之间应保持足够的水平距离（>1.0m），以限制空气混合和携带病毒飞沫的传播。本文可为多人运动引起的气流模式、飞沫扩散和室内感染控制的数值研究提供详细参考。
