Numerical Simulation Of The Spatial Migration Rule Of Fugitive Dusts At Urban Building Construction Sites

The atmospheric particulars pollution is extremely prominent in most cities in our country especially the north Chinese cities. Many researches show that fugitive dust is one of the most important sources of the atmospheric particulars pollution. Over recent years, most cities are in the primrose of the infrastructure construction as the sustained and rapid development of economy and urbanization. In the meantime, coal smoke pollution has been effectively improved, besides wind borne sand is largely relate to seasons, unquestionably air pollution caused by building construction dust is more and more predominant. However, the researches on building construction dust are very infrequent in China. In order to find out the effect to the atmosphere quality caused by building construction dust pollution, we should find out the particle critical mechanism, the distribution situation of the building construction dust, and the movement locus of the building construction dust particle. On the basis of the general overview of the research results on building construction dust at home and abroad and summing up the deficiency of the existing researches on building construction dust. Connecting the characteristic unsealed source of atmospheric particulars pollution, the writer undertakes a systemic experimental study of building construction dust in this paper. Taking a construction site in Lanzhou as the study object, corresponding researches have been done by theoretical analysis and numerical simulation. By means of making the force analysis of a single dust particle, the movement equations of dust particle in different fluid states have been established. The writer uses the numerical computation methods to calculate the dust movement locus, and furthermore, apply Euler-Lagrange-Stochastic trajectory model and Monte-Carlo method, and use MATLAB technology to simulate the diffusing rule of the building construction dust and visually delineate the diffusing rule of dusts. The numerical simulation of the diffusing rule in the air can help to understand the diffusing rule of dusts, which not only has important directive significance to calculate dust discharge amount and dust pollution control but also has practical utility to the prevention of particulars pollution and even the improvement of urban ambient air quality.