| With the development of social economy and the improvement of people’s livingstandards, there are more and more buildings with ventilation and air conditioningsystems. In such relatively closed space, people have long time exposure to the virusand bacteria and other microorganisms particles. Therefore study on the motionpropagation in indoor microbial particles appear particularly important. As one of theimportant factors, the effects of the ventilation rate on indoor bioaerosol propagationis the main content of this thesis.This paper focused on the numerical simulation of microbial aerosoltransmission in ventilation room, based on the theoretical basis of fluid mechanics,heat transfer and multiphase flow. At first, we select a ventilated room for the study,establish a physical model and make the appropriate grid, choose the appropriateboundary conditions and k-epsilon two equation model. According to different formof microbial source situation and different ventilation rate, we carry on the numericalsimulation. From the temperature field, velocity field and concentration field angle,we compare with the results of different ventilation rate and draw conclusions. Andthen，we select the microbial particle trajectory model and simulate the typical size ofmicroorganism particle, in order to understand the distribution of microbial aerosolsand its in indoor sports.The research results show that the greater the ventilation rate, the greater interiorpressure and wind speed at the same location. The greater the ventilation rate, thesmaller the microbial aerosol concentration and the air age. Pollutants from the sourceafter it, the speed will be rapidly reduced airflow. Increasing the amount of wind canshorten the time that aerosol discharge from the room. The microbial aerosol inventilation room follow the air flow, which will produce eddy current near the inletedge. Aerosols follow the air campaign in the central area of the room and then sentout from the outlet. |
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