Direct Numerical Simulation of a cough-induced aerosol-laden turbulent jet interacting with a large-scale circulation

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Kurzfassung

The dispersion of cough-induced particle clouds under the influence of a large-scale circulation (LSC) is studied using direct numerical simulations (DNS). Extending previous research on droplet dispersion in unventilated environments, this study focuses on aerosols within a turbulent cough-generated jet, analyzing their interaction with the LSC and comparing trajectories. The cough-generated jet progresses through critical stages, including the jet and puff phases, which are studied over an extended period of time. It is found that the presence of a LSC increases the maximum horizontal advancement of the particle cloud during the puff phase and alters its shape. Particles larger than 60 µm settle due to gravitational forces, while particles smaller than 60 µm are categorized by size for further analysis using centroid and dynamic time warping (DTW) methods in the horizontal direction. The comparison demonstrates that DTW effectively captures the more complex and dynamic nature of respiratory particle dispersion.

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• Direct Numerical Simulation of a cough-induced aerosol-laden turbulent jet interacting with a large-scale circulation. (deposited 08 Dez 2023 10:14) [Gegenwärtig angezeigt]