Simulation of Pathogen Transport around Buildings Based on Three-Dimensional Model

The unsteady development of pathogens in a room with infective patients is simulated by the non-linear population dynamic model of virus infection. Assuming the indoor pathogen emitting outside from windows, the emitting pathogens are taken as a source for simulating the transmission of pathogen around buildings with airflow. The three-dimensional Reynolds-averaged Navier-Stokes equations coupled with RNG k - epsiv turbulence model is adopted to simulate the wind flow field. By assuming no secondary infection, the time-dependent concentration of pathogen around buildings is obtained and the infectious area is determined with the known pathogenic concentration. The present research is useful for forecasting and controlling the spread of airborne disease virus around buildings.