Effects of space sizes on the dispersion of cough-generated droplets from a walking person.

Effects of space sizes on the dispersion of cough-generated droplets from a walking person.
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DOI:
10.1063/5.0034874
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发表时间:
2020-12-01
期刊:
Physics of fluids (Woodbury, N.Y. : 1994)
影响因子:
--
通讯作者:
Yang X
Yang X
中科院分区:
其他
文献类型:
--
作者:
Li Z;Wang H;Zhang X;Wu T;Yang X

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病毒飞沫的扩散在新冠肺炎的传播中起着关键作用。在这项工作中,我们分析了不同空间大小的咳嗽产生的水滴在步行的人身后的分散情况。空气流动通过求解雷诺平均的Navier-Stokes方程来模拟,液滴被模拟为被动拉格朗日粒子。模拟结果显示,在S咳嗽2次后,雾滴云位于模特腰围和腰部以下,这表明走在感染患者后面的儿童比成年人暴露在更高的传播风险中。更重要的是,发现了两种不同的液滴分散模式,它们占据了明显不同的污染区域。空间尺寸的微小变化能够触发色散模式的转变,即使流型仍然是相似的。这表明了准确模拟空气流动对预测病毒飞沫扩散的重要性,并意味着有必要为不同的环境设定不同的安全距离准则。
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 modeled as passive Lagrangian particles. Simulation results show that the cloud of droplets locates around and below the waist height of the manikin after 2 s 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.
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