The effect of a tall tower on flow and dispersion through a model urban neighborhood
The effect of a tall tower on flow and dispersion through a model urban neighborhood
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DOI：
10.1039/b907135k
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发表时间：
2009-01-01
影响因子：
--
通讯作者：
Wiener, Russell W.
中科院分区：
文献类型：
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作者：
Heist, David K.;Brixey, Laurie A.;Wiener, Russell W.
进行风洞实验是为了检查高塔对均匀建筑物阵列周围气流的影响。此外，还运行了初步 CFD 模拟，以更高分辨率可视化流动。风洞和 CFD 研究中使用的模型旨在模拟美国纽约州布鲁克林的一个地区，该地区的住宅排屋街区形成了与主要城市高速公路接壤的社区。该区域是一项实地研究的地点，该研究以及此处报告的工作的目的是提高对城市微环境中气流和扩散模式的理解。结果表明，高塔对邻近街区街道峡谷的水流具有显着影响，增强了街道峡谷水流与高空自由流之间的交换。特别是，塔楼迎风侧向下和背风侧向上的垂直运动导致侧面街道峡谷中的强烈流动以及塔楼附近街道峡谷中的风力增强。尽管注意到流场存在一些细微差异，但这些现象在风洞和 CFD 结果中均可见。
Wind tunnel experiments were performed to examine the effect of a tall tower on the flow around an otherwise uniform array of buildings. Additionally, preliminary CFD simulations were run to visualize the flow with more resolution. The model used in both the wind tunnel and CFD studies was designed to simulate an area of Brooklyn, NY, USA, where blocks of residential row houses form a neighborhood bordering a major urban highway. This area was the site of a field study that, along with the work reported here, had the goal of improving the understanding of airflow and dispersion patterns within urban microenvironments. Results reveal that a tall tower has a dramatic effect on the flow in the street canyons in the neighboring blocks, enhancing the exchange between the street canyon flow and the freestream flow aloft. In particular, vertical motion down the windward side and up the leeward side of the tower resulted in strong flows in the lateral street canyons and increased winds in the street canyons in the immediate vicinity of the tower. These phenomena were visible in both the wind tunnel and CFD results, although some minor differences in the flow fields were noted.