Numerical simulation of pedestrian-level wind environment based on standard urban building model
Pedestrian-level wind environment is an important indicator of human settlements.To study the influence of different layouts of buildings on the wind environment at pedestrian height(Z=1.5 m),computational fluid dynamics was used to simulate the wind environment of a standard urban building model.Firstly,the grid independence test and simulation accuracy test were carried out,and the reliable grid scheme and simulation conditions were determined.Then,through numerical simulation,the distribution law of average wind speed field and trace field in the central area of the standard urban building model was obtained and summarized.By changing the building density,relative height and degree of staggeredness of the building cluster model,the influences of different conditions on the wind environment were studied.The results show that the average wind speed in the central region is higher than that of the incoming flow,and there are several vortex regions.The extreme wind speed zone is directly in front of and behind the central building.The average wind speed in the central area is not sensitive to the change of building density,but when the building density is below 0.55,the wind speed rapidly decays.The height ratio of the surrounding buildings and the central building has a significant impact on the average wind speed in the central area.The average wind speed decreases with the increase of the height ratio.When the height ratio reaches around 0.5,there is a sudden drop in wind speed.The average wind speed in the central region decreases approximately linearly with the increase of the degree of staggeredness,and the wind environment of different staggered forms is significantly different.
pedestrian-level wind environmentstandard urban building modelnumerical simulationgreen buildingcomputational fluid dynamics
万方数据
维普
