ORCID Profile
0000-0002-2592-1426
Current Organisation
Barcelona Supercomputing Center
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Publisher: Elsevier BV
Date: 04-2020
Publisher: Elsevier BV
Date: 07-2023
Publisher: Oxford University Press (OUP)
Date: 18-02-2013
DOI: 10.1093/GJI/GGT027
Publisher: AIP Publishing
Date: 12-2021
DOI: 10.1063/5.0072148
Abstract: High fidelity simulations of expiratory events such as coughing provide the opportunity to predict the fate of the droplets from the turbulent jet cloud produced from a cough. It is well established that droplets carrying infectious pathogens with diameters of 1–5 μm remain suspended in the air for several hours and transported by the air currents over considerable distances (e.g., in meters). This study used a highly resolved mesh to capture the multiphase turbulent buoyant cloud with suspended droplets produced by a cough. The cough droplets' dispersion was subjected to thermal gradients and evaporation and allowed to disperse between two humans standing 2 m apart. A nasal cavity anatomy was included inside the second human to determine the inhaled droplets. Three diameter ranges characterized the droplet cloud, & μm, which made up 93% of all droplets by number 5 to 100 μm comprised 3%, and & μm comprising 4%. The results demonstrated the temporal evolution of the cough event, where a jet is first formed, followed by a thermally driven puff cloud with the latter primarily composed of droplets under 5 μm diameter, moving with a vortex string structure. After the initial cough, the data were interpolated onto a more coarse mesh to allow the simulation to cover ten minutes, equivalent to 150 breathing cycles. We observe that the critical diameter size susceptible to inhalation was 0.5 μm, although most inhaled droplets after 10 min by the second human were approximately 0.8 μm. These observations offer insight into the risk of airborne transmission and numerical metrics for modeling and risk assessment.
Publisher: Oxford University Press (OUP)
Date: 23-04-2014
DOI: 10.1093/GJI/GGU086
Publisher: Informa UK Limited
Date: 11-11-2020
No related grants have been discovered for Guillaume Houzeaux.