Gilani, Ryid et Ghasemi, Abbas.
2025.
« Large eddy simulations of freely evolving and colliding human exhalation flows ».
In Proceedings of the CSME-CFDSC-CSR 2025 International Congress (Montreal, QC, Canada, May 25-28, 2025)
Coll. « Progress in Canadian Mechanical Engineering », vol. 8.
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Résumé
Large eddy simulations (LES) are performed to investigate the characteristics of freely evolving and colliding jets, representative of human exhalation, at Reynolds numbers Re = 700 and 1400. The study examines the effects of three mouth shapes with aspect ratios (AR = 1, 2, 4) and two colliding momentum ratios (M = 1, 2). The axial and lateral extent of the flows is quantified and validated against experimental data, with implications for pathogen transport in unshielded conversations. The LES results capture key characteristics of starting and transitioning circular/elliptic jets, providing valuable insight into the formation and evolution of vortical structures carrying the exhaled pathogens. The colliding flow interactions are strongly influenced by whether the collision is symmetric (M = 1) or asymmetric (M = 2). Symmetric collisions lead to lateral flow redirection, forming a stagnation plane or “blocking effect” at the center of the domain, which reduces pathogen transmission. In contrast, asymmetric collisions result in a weaker blocking effect, as the stronger jet overpowers the weaker one leading to an increased risk of exposure for the weaker speaker.
| Type de document: | Compte rendu de conférence |
|---|---|
| Éditeurs: | Éditeurs ORCID Hof, Lucas A. NON SPÉCIFIÉ Di Labbio, Giuseppe NON SPÉCIFIÉ Tahan, Antoine NON SPÉCIFIÉ Sanjosé, Marlène NON SPÉCIFIÉ Lalonde, Sébastien NON SPÉCIFIÉ Demarquette, Nicole R. NON SPÉCIFIÉ |
| Date de dépôt: | 18 déc. 2025 15:11 |
| Dernière modification: | 18 déc. 2025 15:11 |
| URI: | https://espace2.etsmtl.ca/id/eprint/32404 |
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