Research On Vehicle Exhaust Diffusion Simulation And Three-dimensional Dynamic Visualization

With the advancement of science and technology,especially after the second industrial revolution,the pollution problem has been accompanied by the developme nt of industry,and the problem of air pollution is one of the pollution events that cannot be ignored.Air pollution not only brings direct hazards such as dust and smog,but also causes indirect hazards such as acid rain and reducing radiation on the ground.In addition,long-term inhalation of a large number of pollutants may cause respiratory diseases such as asthma and even lung cancer.Therefore,the harm of excessive pollutant concentration in the air to human body has also received increasing attention.In the field of Geographic Information System(GIS),we study the law of vehicle exhaust gas diffusion in urban blocks,and carry out scientific and effective simula t io n and analysis of diffusion process and concentration field distribution,which can play an active and necessary role in improving pollution measures.In terms of gas diffusion simulation,there are more mature models and some software,but little display and analysis of simulation results in recent researsh,especially 3D visualization.And existing research have focused on model mechanis m analysis or simple visualization,lacking the integration of simulation and visualiza t io n capabilities,and it is difficult to integrate geographic information.Therefore,this paper holds that further research in air pollution space modeling,visualization and integrat io n analysis is necessary.The research work of this paper is as follows:(1)Considering the blocking and occlusion of 3D buildings,the California Line Source Dispersion Mode 4(CALINE4)is optimized with the advantages of 3DGIS.The effects of multiple road concentrations is considered in the process of simulat io n,which makes it more consistent with the real diffusion situation.(2)Based on the dynamic stereoscopic technology of GPU,its key technologies such as gradient calculation,volume texture resampling and dynamic interpolation are optimized.Thus,the street scale vehicle exhaust gas diffusion process can be dynamically expressed,also the visualization of vehicle exhaust diffusion is realized..(3)The gas diffusion simulation,based on optimized CALINE4 model,and 3DGIS are fully integrated in this paper.Then the simulation and real-time visualiza t io n of vehicle exhaust diffusion is realized,by modeling the diffusion process data uniformly.So far,an analysis and display system integrating diffusion simulation and result visualization has been formed.