Simulation Study On Wind Environment And Pollutant Diffusion Of Determinant Buildings

With the increase of world population,the number of buildings accommodating human life in cities is also increasing,which brings about the problem of architectural environment to be solved,and the wind environment is the most important factor affecting the external environment of buildings.China's building wind environment has been criticized,such as environmental pollution,has been included in the work report of the State Council.The study of the problem needs to start with the basic physical laws,in order to make a good analysis of the complex and mutable situation in the actual case.Therefore,first of all,by consulting the research status at native and foreign,this paper clarifies the main research direction of the subject.Then,FLUENT and other simulation software are used to study the current situation of building wind environment and pollutant diffusion,and building occlusion is used as a clue to promote the research.At the same time,wind tunnel test data are used to verify the setting of simulation parameters.Firstly,the evaluation method of wind pressure is discussed from the single building shelter.By changing the wind direction,building spacing,building depth and building height ratio,the influence of different physical parameters on the wind pressure difference of each part of the back row building is studied,so as to judge its natural ventilation potential.In the building complex,the two variables are the layout of buildings and the direction of wind flowing.The maximum,minimum and average wind speed ratios of 21 working conditions are discussed,and the better and worse areas in each working condition are obtained,which can provide reference for pedestrian travel and real estate developers' architectural layout design.Ultimately for long strip buildings in the form of street canyons,the dimensionless concentration of pollutants is used to measure the change of street height ratio in the overall street canyon flow field and pollutant diffusion.The setting of two lanes can provide ideas for the study of actual vehicle exhaust emissions.In this paper,the intensive study of the theory and practice of building wind environment has very strong practical significance for architectural design.