论文标题
空间大小对步行者的咳嗽产生液滴的分散的影响
Effects of space sizes on the dispersion of cough-generated droplets from a walking person
论文作者
论文摘要
病毒液滴的分散在Covid-19的传播中起关键作用。在这项工作中，我们分析了一个步行者以适合不同空间尺寸的步行者后，咳嗽产生的液滴的分散。通过求解雷诺平均的Navier-Stokes方程来模拟气流，并将液滴建模为被动拉格朗日颗粒。仿真结果表明，咳嗽两秒钟后，液滴云位于Manikin的腰部高度周围和下方，这表明走在感染性患者后面的孩子比成年人接触到更高的传播风险。更重要的是，发现了两种不同的液滴色散模式，占据了显着不同的污染区域。发现空间大小的略有变化能够触发分散模式的过渡，即使流动模式仍然相似。这表明了准确模拟空气流在预测病毒液滴分散方面的重要性，并暗示有必要为不同环境设置不同的保险固定指南。
The dispersion of viral droplets plays a key role in the transmission of COVID-19. In this work, we analyze the dispersion of cough-generated droplets in the wake of a walking person for different space sizes. The air flow is simulated by solving the Reynolds-Averaged Navier-Stokes equations, and the droplets are modelled as passive Lagrangian particles. Simulation results show that the cloud of droplets locates around and below the waist height of the manikin after two seconds from coughing, which indicates that kids walking behind an infectious patient are exposed to higher transmission risk than adults. More importantly, two distinct droplet dispersion modes occupying significantly different contamination regions are discovered. A slight change of space size is found being able to trigger the transition of dispersion modes even though the flow patterns are still similar. This shows the importance of accurately simulating the air flow in predicting the dispersion of viral droplets and implies the necessity to set different safe-distancing guidelines for different environments.
