Research On The Correlation Between The 3D Patterns Of Urban Buildings And Urban Wind Environment

Qualified urban wind environment is an important part of livable urban settlements.Recently,how to create a livable and pleasant wind environment through urban design strategies has received widespread attention.And to clarify the correlation between urban buildings and wind environment should be the most important theoretical basis,which specifically involves how to make an effective and scientific assessment of the urban wind environment,and how to establish the relationship between the threedimensional pattern of urban buildings and the wind environment.The thesis made research from “theoretical analysis”,“strategy making” to “design validation” based on computational fluid dynamics(CFD),and mainly includes three aspects.First,the characteristics,classification and application methods of wind environment evaluation indicators have been analyzed under urban situation,and so to summarized the urban wind environment evaluation system.Second,the correlation between urban breathing evaluation indicators and the three-dimensional pattern of urban buildings has been conducted in-depth research,so to identify the influencing variation and make design strategies.Third,conduct urban ventilation-oriented design research taken Xuzhou as an example.For urban wind environment assessment,through comprehensive analysis of a large number of indicator concepts,an indicator system of description--analysis--evaluation was established,and the characteristics,differences and application methods of various indicators were explained.Aiming at the three-dimensional pattern of urban buildings,this thesis has improved the quantitative index system of three dimensional urban buildings with the ? parameter mainly,which is divided into three categories,futhermore,added the building layout as a key design point.Then the correlation between the two is further studied based on CFD.This study concluded that the three dimensional patterns of various buildings and urban wind environment indicators showed different correlations and trends under ideal conditions.For similar residential communities,the smaller the building base area or building density,the smaller the windward area ratio,and the smaller the length of the main street,which is more conducive to obtaining good ventilation conditions.When the street canyon factor is appropriate,if the main street is at a certain angle to the wind direction,and the staggered layout is used,it is more conducive to promoting the diffusion of pollutants.In order to apply the conclusions from the ideal model analyze to the practical urban construction of Xuzhou,this thesis selected 20 different typical residential communities in Xuzhou for futher simulation,analyzed the characteristics of the wind environment of each district,identify the three-dimensional pattern features of well ventilated cases,and also infers that open space is an important design element that affects the wind environment of the community.Accordingly,the design strategy of creating a good wind environment was perfected.The CFD based urban wind field simulation analysis method is conducive to obtaining the reference value of related design indicators,and is of great significance for the post evaluation of residential communities,which become not only a research method but also available design tool.Finally,this thesis takes the southern plot of Kuazaiting in Xuzhou City as an example to conduct design research,combining the wind environment oriented design strategy with classic design methods,and proves the feasibility and long-term value of this design strategy for improving the urban wind environment.