城市街区与建筑物对气流特征影响的数值模拟研究

A numerical simulation of the effects of urban blocks and buildings on flow characteristics

利用一个湍流能量闭合的三维城市街渠气流模式对一个范围为 1 2 5 0m× 1 2 0 0m的居民小区中的建筑物群体对不同来流风向下小区内的流场结构的影响进行了诊断分析。模拟表明 :小区内建筑物复杂的几何形状所引起的空气动力学强迫作用使得该区域内的气流结构十分复杂。

A three-dimensional high resolution turbulence energy closure model is used to simulated the flow structures in urban sub-domains and canyons. A numerical cas e is carried out to simulate and analyze the flow structures in an urban sub-do main (in size of 1250m×1200m) under different inflow wind directions, and the r esult shows that the flow structure is simulated in good details. The complex ge ometric shapes of buildings lead to a complex flow structure in this area. Wind speed is weakened in low layer due to the resistance and drag of buildings .