Stochastic Lagrangian Modeling for Large Eddy Simulation of Dispersed Turbulent Two-Phase Flows

by

Abdallah S. Berrouk

DOI: 10.2174/97816080529671110101
eISBN: 978-1-60805-296-7, 2011
ISBN: 978-1-60805-377-3



Indexed in: Scopus, EBSCO.

Understanding the dispersion and the deposition of inertial particles convected by turbulent flows is a domain of research of consider...[view complete introduction]
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Expiratory Droplet Dispersion in a Mechanically Ventilated Enclosure

- Pp. 95-107 (13)

Abdallah Sofiane Berrouk

Abstract

<p>After the epidemic outburst of avian influenza and severe acute respiratory syndrome (SARS) in East and Southeast Asia, there has been a burgeoning research interest in investigating the control and transport's mechanisms of airborne bacteria and viruses indoors and in confined environments such as aircraft cabin. Dispersion of microorganism-laden aerosols exhaled from infected patients was admitted as a potential airborne transmission pathway. Consequently, competent understanding of aerosol dispersion and deposition is necessary to improve exposure assessment tools and models and endorse efficient ventilation strategies that can considerably reduce indoor particle concentrations and improve the indoor air quality.</p> <p>This investigation attempts to provide a realistic simulation of the time-dependant flow field in a chamber inhabited with two heated manikins using the well resolved LES approach. The potential of both the Eulerian and the Lagrangian approaches coupled to LES of non-isothermal airflow to study dispersion characteristics of expiratory aerosols has been examined.</p> <p>Experimental and numerical findings on the flow and temperature fields were recorded and show all good agreements. By taking into account the uncertainly of the particle counter used in the experimental work, globally the agreement between the experimental results and the computational modeling predictions on aerosols rates of decay is quite acceptable.</p>

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