Numerical Simulation of Urban Heat Island Effect Based on Porous Media Model
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在城市发展的背景下,选取了常见的3种城市形态,即单中心城市、多中心城市、网格城市.建立了 3种不同城市形态的三维多孔介质模型,使用CFD软件模拟了 3种城市的城市热岛效应.结果表明,在静风状3种城市的热岛强度峰值的顺序为单中心城市＞多中心城市＞网格城市,单中心城市的热岛强度峰值比网格城市热岛强度峰值高出0.3 K.其次研究了环境风对城市热岛效应的影响,设置1 m/s、3 m/s、5 m/s 3种不同的风速.结果表明3种城市的热岛效应都随风速的增加而减弱.环境风较小时,不能破坏城市原有的流场,对城市热岛的影响较小,当环境风成为城市的主导风速,能够大幅地降低城市热岛强度.当风速为5 m/s时3种城市的热岛强度分别下降了 0.43 K,0.52 K,0.53 K.
Under the background of urban development,three common urban forms,namely single-center city,multi-center city and grid city were selected.The three-dimensional porous media models of three different urban forms were es-tablished,and the urban heat island effect of the three cities was simulated by CFD software.The results show that the peak heat island intensity of the three cities in the calm wind pattern is in the order of single-center city＞multi-center city＞grid city,and the peak heat island intensity of the single-center city is 0.3 K higher than that of the grid city.Sec-ondly,the influence of ambient wind on urban heat island effect was studied,and three different wind speeds of 1 m/s,3 m/s and 5 m/s were set.The results show that the heat island effect of the three cities decreases with the increase of wind speed.When the ambient wind is small,it cannot destroy the original flow field of the city and has little impact on the urban heat island.When the ambient wind becomes the dominant wind speed of the city,the intensity of the urban heat is-land can be greatly reduced.When the wind speed is 5 m/s,the heat island intensity of the three cities decreases by 0.43 K,0.52 K and 0.53 K respectively.
NETL
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