Speaker: Prof. Li Shaofan, UC Berkeley

Time: 10:00-11:30 a.m., July 2, 2023, GMT+8

Venue: College of Engineering, Building No.1, Room 210

Abstract:

Coronavirus disease 2019 (COVID-19) is a contagious disease caused by infection of the SARS-CoV-2 virus, whichcan lead to deadly severe acute respiratory syndrome. Since late 2019, COVID-19 has rapidly spread world-wide andcaused the current global pandemic.

The main route of transition of the SARS-CoV-2 virus is through the virion-contained droplet and aerosol dispersiorand transmission, which come from the exhaled airflow of cough jets from sneezing and coughing of the virus carriersIn this talk, I shall present a systematic modeling study on the in-door air flow characteristics of human cough jets byusing large scale multi-phase fluid dynamics modeling and large eddy Smoothed Particle Hydrodynamics (SPH)
simulations.

In the past two years, we have conducted large scale (>200 million particles) multiphase SPH turbulence flowcalculations to simulate the real size and real time human cough jet development and expiratory droplet dispersion anoaerosol formation process, providing the fundamental physical details on the spatial and temporal evolution of humancough jets, shedding the light on social distance policy and prevention measures on future infectious respiratorydiseases. In particular, we have studied the effects of two-way coupling, i.e., the coupling between air and droplets, onturbulence structure and duration of the cough jet.

Biography:

Dr. Shaofan Li is currently a full professorof applied and computational mechanics at the University ofCalifornia-Berkeley, Dr, Li graduated from the Department of Mechanica Engineering at the East China UIniversity otScience and Technology (Shanghai, China) with a Bachelor of Science (B.S.) degree in 1982; he also holds a Master ofScience (M.S.) degree in Applied Mechanics (the Huazhong University of Science and Technology, Wuhan, China) ancin Aerospace Engineering (the University of Florida (Gainesville, FL, USA) in 1989 and 1993, respectively. In 1997, DrLi received a Ph.D. degree in Mechanical Engineering from Northwestern University (Evanston, IL, USA), and he hadbeen also a post-doctoral researcher at Northwestern University during 1997-2000.

Source: College of Engineering