Numerical Simulation Of Microbial Pollutant Particle Dispersion Around Buildings

With the densification of population in central urban area and the deterioration of city ecological cycle, especially in developing countries, the airborne disease virus is becoming a new challenge for human. The particle transport of airborne disease virus is paid attention by researchers.A three-dimensional Euler-Lagrange model is established to simulate the movement of airborne disease virus. The continuous phase flow field is computed with the RNG k -εturbulence model and the movement of microbe particle is determined by Lagrange model with stochastic tracking method to consider the turbulent effects.The residence time distribution of particle is obtained with different incoming velocity. With the fixed ejection speed of virus particle, the concentration of particle in the computation domain is obtained. The determination principle of ejection number of particle is outlined. With the ejection number of particle determined by the virus infection dynamic model, the concentration of particle in the computation domain is found. Furthermore, by considering the effect of surviving time of virus, the concentration of particle around buildings is obtained. The present research is useful to forecast and control the spread of airborne disease virus. It is also favorable to establish virus-alarm systems and make suitable evacuation plans.