CFD modelling of Cough Saliva Droplets
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  • Release Date: 2022-01-19
  • COVID-19
  • cough droplet dispersion
  • airborne transmission
  • computational fluid dynamics (CFD)
Video Introduction

This video is adapted from 10.3390/math9050574

The coronavirus disease 2019 (COVID-19) outbreak has altered the lives of everyone on a global scale due to its high transmission rate. In the current work, the droplet dispersion and evaporation originated by a cough at different velocities is studied. A multiphase computational fluid dynamic model based on fully coupled Eulerian–Lagrangian techniques was used. The evaporation, breakup, mass transfer, phase change, and turbulent dispersion forces of droplets were taken into account. A computational domain imitating an elevator that with two individuals inside was modeled. The results showed that all droplets smaller than 150 μm evaporate before 10 s at different heights. Smaller droplets of <30 µm evaporate quickly, and their trajectories are governed by Brownian movements. Instead, the trajectories of medium-sized droplets (30–80 µm) are under the influence of inertial forces, while bigger droplets move according to inertial and gravitational forces. Smaller droplets are located in the top positions, while larger (i.e., heaviest) droplets are located at the bottom.

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Fernandez-Gamiz, U.; Aramendia, I.; Chillón, S.A.; Ugarte-Anero, A.; Zulueta, E. CFD modelling of Cough Saliva Droplets. Encyclopedia. Available online: (accessed on 15 April 2024).
Fernandez-Gamiz U, Aramendia I, Chillón SA, Ugarte-Anero A, Zulueta E. CFD modelling of Cough Saliva Droplets. Encyclopedia. Available at: Accessed April 15, 2024.
Fernandez-Gamiz, Unai, Iñigo Aramendia, Sergio A. Chillón, Ainara Ugarte-Anero, Ekaitz Zulueta. "CFD modelling of Cough Saliva Droplets" Encyclopedia, (accessed April 15, 2024).
Fernandez-Gamiz, U., Aramendia, I., Chillón, S.A., Ugarte-Anero, A., & Zulueta, E. (2022, January 19). CFD modelling of Cough Saliva Droplets. In Encyclopedia.
Fernandez-Gamiz, Unai, et al. "CFD modelling of Cough Saliva Droplets." Encyclopedia. Web. 19 January, 2022.