城市水流中弓形涡的产生和破坏机理
On the generation and destruction mechanisms of arch vortices in urban fluid flows
摘要：
研究和解释城市地区存在的不同流动模式变得至关重要，因为它们有助于通过更好地了解城市环境中污染物的动态来制定应对气候变化的新方法。本研究利用高阶动态模式分解法（HODMD）分析各种简化都市环境中的湍流的高保真度资料库。模拟的几何体由两个相隔一定距离的建筑物组成。研究了三个不同的案例，与参考书目中确定的三种不同制度相对应。我们认识到著名的拱涡形成的背风侧的第一个建筑物和文件可能产生和破坏机制的基础上产生的时间模式，这个漩涡的特点。这些所谓的涡产生和涡破碎模式进一步分析通过适当的正交分解。我们发现，拱涡在城市环境中的污染物的分散中起着突出的作用，在那里它的产生导致其浓度的增加，因此，所报告的机制在城市可持续发展的背景下是极其重要的。
英文摘要：
Studying and interpreting the different flow patterns present in urban areas is becoming essential since they help develop new approaches to fight climate change through an improved understanding of the dynamics of the pollutants in urban environments. This study uses higher order dynamic mode decomposition (HODMD) to analyze a high-fidelity database of the turbulent flow in various simplified urban environments. The geometry simulated consists of two buildings separated by a certain distance. Three different cases have been studied, corresponding to the three different regimes identified in the bibliography. We recognize the characteristics of the well-known arch vortex forming on the leeward side of the first building and document possible generation and destruction mechanisms of this vortex based on the resulting temporal modes. These so-called vortex-generating and vortex-breaking modes are further analyzed via proper-orthogonal decomposition. We show that the arch vortex plays a prominent role in the dispersion of pollutants in urban environments, where its generation leads to an increase in their concentration; therefore, the reported mechanisms are of extreme importance in the context of urban sustainability.
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