Institute of Public Safety Research, Department of Engineering Physics, Tsinghua University, Beijing 100084, PR China; Beijing Key Laboratory of City Integrated Emergency Response Science, Tsinghua University, Beijing 100084, PR China.
Institute of Public Safety Research, Department of Engineering Physics, Tsinghua University, Beijing 100084, PR China; Beijing Key Laboratory of City Integrated Emergency Response Science, Tsinghua University, Beijing 100084, PR China.
Sci Total Environ. 2023 Apr 15;869:161750. doi: 10.1016/j.scitotenv.2023.161750. Epub 2023 Jan 21.
Human movement affects indoor airflow and the airborne transmission of respiratory infectious diseases, which has attracted scholars. However, the interactive airflow between moving and stationary people has yet to be studied in detail. This study used the numerical method validated by experimental data to explore the transient indoor airflow and virus-laden droplet dispersion in scenes with interactive human movement. Human-shaped numerical models and the dynamic mesh method were adopted to realize human movement in scenes with different lateral distances (0.2-1.2 m) between a moving person and stationary (standing/sitting) persons. The interactive human movement obviously impacts other persons' respiratory airflow, and the lateral fusion ranged about 0.6 m. The interactive human movement strengthens the indoor airflow convection, and some exhaled virus-laden droplets were carried into wake flow and enhanced long-range airborne transmission. The impact of interactive human movement on sitting patients' exhalation airflow seems more evident than on standing patients. The impact might last over 2 min after movement stopped, and people in the affected area might be at a higher exposure. The results can provide a reference for epidemic control in indoor environments.
人体运动影响室内气流和呼吸道传染病的空气传播，这引起了学者们的关注。然而，对于运动和静止人群之间的交互气流，仍需要进行详细研究。本研究采用经过实验数据验证的数值方法，探讨了具有交互人体运动的瞬态室内气流和携带病毒飞沫的扩散。采用人体形状的数值模型和动态网格方法，实现了运动人与静止人（站立/坐下）之间不同横向距离（0.2-1.2 米）的场景中的人体运动。交互人体运动明显影响其他人的呼吸气流，横向融合范围约为 0.6 米。交互人体运动增强了室内气流对流，一些呼出的携带病毒飞沫被带入尾流并增强了远程空气传播。交互人体运动对坐着的病人呼气气流的影响似乎比站着的病人更为明显。这种影响可能在运动停止后持续超过 2 分钟，处于受影响区域的人可能面临更高的暴露风险。研究结果可为室内环境中的疫情防控提供参考。
