Research And Implementation On Emergency Simulation And Visualization Of Air Pollution Dispersion

As the development of industry and acceleration of urbanization, air pollution is becoming serious, especially in urban environment where high buildings stand side by side and crowds are dense. As to air pollution accidents, which disperse quickly and can not be forecasted, could produce horrible damage to people. Once accident takes place, we should estimate the direction and area of pollution dispersion and adopt the effective measures as soon as possible, which could reduces the influences and protect people's health to maximum extent. As a result, research on simulation of pollution dispersion and its visualization is cared by many universities and government institutes, which has been a hot topic in related areas.In this paper, we combine the base principles of physics-based fluid simulation and environment conditions when air pollution accidents arise and give a reasonable simulation model. Meanwhile, this paper introduces and discusses the numerical methods in detail that are needed to solve the model. Then, this paper visualizes the data produced by model using volume rendering and discusses the performance and results. Finally, we introduce the technologies of interaction and display in CAVE-like environments.As the core of this paper, simulation modeling of air pollution dispersion is still limited by lots of problems. So there is no model which can meets each kind of requirements. In this paper, the mathematic description of physics-based fluid simulation is simplified and improved according to the environment and requirement of pollution accidents, which can produces the results as soon as possible and guarantee the validity to some extent.In this paper, we give a survey on direct volume rendering based on texture mapping, by means of the programmable graphics pipe and parallel processing ability provided by modern GPU, which could visualize the concentration data of pollution distinctly and intuitively in real time. In the end, we introduce the technologies of interaction and display in CAVE-like virtual reality environment, which could improve the observation and cognition to the result of visualization.Our pollution dispersion model and technologies of visualization could generate the results of simulation and visualize them quickly. To some extent, it is enough to satisfy the need of urban security emergency response. So we think that they have some degree of theoretical and practical value.