Research On The Wind Environment And Thermal Environment Of Building Group In The Coastal Area Of East China

The wind environment and thermal environment can affect the microclimate of urban.The number of buildings increased rapidly with the acceleration of urbanization.Compared with the wind and thermal environment and comfort of human,urban designers are mainly concerned about the population and economy.As an important component of urban space,the wind and thermal environment is significant for urban buildings.In this paper,computational fluid dynamics(CFD)method is used to simulate and analyze the wind and thermal environment of urban buildings.The purpose is to improve the outdoor wind and thermal environment,and the phenomenon of heat and dust accumulation is not prone to occur,and improve the outdoor comfort.The main research work is as follows:Firstly,applying CFD method and comparing with the CAARC standard model and four building models of high density residential area in Tokyo,the turbulence model and the radiation model are built to verify the accuracy of the methods.Secondly,the wind environment of a building group in the coastal area of East China is simulated in summer and winter.The results show that in summer,the presence of the corridor makes the wind environment quality worse in the leeward area of the C-shaped building,and the phenomenon of heat and dust accumulation is prone to occur.After removing the corridor,the wind speed in the area increased by 4.3%,and the wind environment quality was improved.In winter,there is a high air pressure difference at the corridor,and the airflow through the building generates spiral updraft,which may raise dust easily and make the wind environment quality worse.Removing the corridor can largely reduce the air pressure difference and smooth the airflow,the dust on the ground cannot be raised easily.Analyzing the reasons why the corridor affects the wind environment,the airflow through the building generates ground vortex airflow and spiral updraft,which make the wind environment quality worse.Finally,the thermal environment of a building group is simulated in summer.Analyzing the air temperature and the building exterior wall temperature,the following conclusions show that,a high temperature around the C-shaped building and the heat diffusion is slow.After removing the corridor,the temperature of C-shaped building is decreased by 2.2% which means the thermal environment is improved.The external wall temperature of single building has regular distribution in the vertical and horizontal.According to the regular distribution,we can choose suitable building materials or plant green plants to improve the outdoor comfort.Based on the simulation results of a building group,this paper can provide effective analysis and evaluation on the wind and thermal environment for local unreasonable regions that been built,and provide certain reference for further research on the wind and thermal environment in the area.