Measurements and Computations of Flow in an Urban Street System
Measurements and Computations of Flow in an Urban Street System
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DOI：
10.1007/s10546-016-0200-7
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发表时间：
2017-02-01
影响因子：
4.3
通讯作者：
Coceal, O.
中科院分区：
文献类型：
--
作者：
Castro, Ian P.;Xie, Zheng-Tong;Coceal, O.
我们目前的结果从实验室和计算实验的湍流在一个阵列的矩形块建模一个典型的，不对称的城市冠层在不同的方向的方法流。这项工作形成了一个更大的研究分散在这样的阵列（项目DIPLOS）的一部分，并集中在树冠区域内的平均流场和湍流场的性质，认识到，除非流场是充分表示在计算模型中，没有理由期望现实的模拟的性质的扩散的污染物排放的树冠内。实验数据和大涡模拟（LES）和直接数值模拟（DNS）获得的数据之间的比较，它的结论是，仔细使用LES可以产生一般良好的协议与实验室和DNS的结果，贷款进一步的信心在使用LES这种情况下。各种关键问题进行了讨论和建议，提供给实验和那些寻求计算冠层流湍流解决模式。
We present results from laboratory and computational experiments on the turbulent flow over an array of rectangular blocks modelling a typical, asymmetric urban canopy at various orientations to the approach flow. The work forms part of a larger study on dispersion within such arrays (project DIPLOS) and concentrates on the nature of the mean flow and turbulence fields within the canopy region, recognising that unless the flow field is adequately represented in computational models there is no reason to expect realistic simulations of the nature of the dispersion of pollutants emitted within the canopy. Comparisons between the experimental data and those obtained from both large-eddy simulation (LES) and direct numerical simulation (DNS) are shown and it is concluded that careful use of LES can produce generally excellent agreement with laboratory and DNS results, lending further confidence in the use of LES for such situations. Various crucial issues are discussed and advice offered to both experimentalists and those seeking to compute canopy flows with turbulence resolving models.