JAUE2017-014: The Correlation between Street Spatial Layout Factors and Wind Environmen

Abstract

With a rapid urbanization in China, the high-density new urban-center districts have already changed the 
microclimate in the city. Because of the using characters of building the commercial pedestrian streets which have 
emerged massively making a large number of pedestrians appear in there, pedestrian comfort in the commercial 
streets of the new urban-center districts requires more attention. Different street spatial layout will change the wind 
environment in the street and then influence the pedestrian comfort. Computational fluid dynamics (CFD) models 
are used to study the correlation between the three main street spatial layout factors，which is near-line rate, street 
interface density and street aspect ratio, under the simulation with relevant weather conditions. The results show: 
first, the wind speed within the street change with the increase in the near-line rate like a parabola trend and the 
wind speed reaches its peak about at a near-line rate of 70%. In that case, it’s conducive to ventilation. Second, as 
the street interface density decreases, the fluctuation of the wind speed of each measuring point in the 
commercial pedestrian streets is getting bigger, thus the pedestrian walking in it will feel a strong wind speed change 
and the comfort is greatly reduced. Last, the wind speed in the city streets is inversely proportional to the street 
aspect ratio. The conclusion above will provide an evaluation basis for urban planners and architects at the beginning 
stage of the design to effectively avoid the potential poor physical environment.