Numerical Simulation of Coughed Droplets in Conference Room

The viruses spread in the air-conditioning room with the droplets produced by talking, coughing, sneezing and other respiratory behavior, which pollute the indoor air and threaten to human health. This paper studies the influence of lateral-supply top-return, upper-supply top-return and bottom-supply upper-return in the transport of coughed droplets by using a Lagrangian model in a conference room, besides no ventilation is considered for comparison. The non-steady-state is used and gravity, drag force and Brownian force of coughed droplets are accounted. The simulation results indicate that the exposed sitting at the middle of conference table are more susceptible to infection for lateral-supply top-return and upper-supply top-return. The exposed sitting near the polluter are more susceptible to infection in bottom-supply upper-return. Bottom-supply upper-return air-flow organization, such as Displacement Ventilation and Underfloor Air Distribution, can control the spread of respiratory diseases effectively and provide people with a healthy and comfortable indoor environment.