Study on leakage and diffusion characteristics of Brucella in block based on CFD simulation

 On the basis of establishing the building group model in the block near Lanzhou Biopharmaceutical Factory, the diffusion of Brucella particles is simulated by using the discrete phase model, and the short-term diffusion characteristics in different wind directions are analysed. The diffusion distance and the maximum height of influence in a short time are determined. It is found that the diffusion rate of Brucella particles is relatively fast, and when the wind speed is 3.3 m/s, the Brucella particles can diffuse to 500 m from the emission source at 300 s and 2 000 m at 1 h. The diffusion height increases with the increase of diffusion distance. It is suggested that the real-time microbial monitoring devices should be installed at the exhaust outlet, at the 50 m height of adjacent community, and at the 1.5 m height of the street valley between the emission source building and the northwest building.