摘要
数值模拟实验利用非静力、能量闭合的大气边界层模式对多个不同城市街渠单体在来流风向垂直于街渠时其内部的气流结构和湍流特征进行了模拟 .模式能够较好地模拟出不同长度的三维街渠内的 3种典型的气流结构 :爬越流、尾流扰流和孤立粗糙流 .将模拟结果与Oka的风洞实验结果以及Hunter等人的数值模拟结果进行了比较 ,两者能够较好的吻合 .研究结果表明 :街渠的形状对街渠中的气流结构的形成有至关重要的影响 ,在街渠长高比和高宽比不同的情况下将形成不同的气流结构 .在街渠附近湍流活动的活跃区是相对稳定的 .最后利用本模式对来流与街渠呈 4 5°时的一个个例进行了模拟 .
A three dimensional, non hydrostatic numerical model with high spatial resolution, in which an energy closure is employed, is investigated to simulate the flow structures and turbulence in a simple street canyon when the coming flow crosses over the canyon. Three kinds of typical flow structure skimming flow, wake interference flow and isolated roughness flow can be simulated with this model. The results prove to be identical with the numerical simulation made by Hunter. et al and the wind tunnel experiments made from Oka. This research indicates that the shape of street canyon is an important factor to the flow structure in street canyons. Different flow structure patterns will be formed at some different ratios of canyon length to its height and canyon height to its width, respectively. Different flow structures appear with different canyon length to height ratios and canyon height to width ratios. The active area of turbulence is stable.
出处
《南京大学学报（自然科学版）》
CAS
CSCD
2000年第6期760-772,共13页
Journal of Nanjing University（Natural Science）
基金
江苏省自然科学基金(BK97028)
中国科学院大气物理研究所LAPCKZ952-S1-405项目
关键词
数值模拟
湍流能量闭合
街渠
numerical simulation
turbulence energy closure
street canyon
