Effects of Building Arrays on Large-Scale Turbulent Motions Within an Urban Canopy
Effects of Building Arrays on Large-Scale Turbulent Motions Within an Urban Canopy
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DOI：
10.1007/s10546-022-00778-7
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发表时间：
2023-01
影响因子：
4.3
通讯作者：
T. Michioka;Ryo Funaki;Takumi Kawai
中科院分区：
文献类型：
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作者：
T. Michioka;Ryo Funaki;Takumi Kawai
在一个理想化的城市冠层内，在流向街道上的大尺度湍流运动与峡谷中的展向运动相耦合，但建筑物阵列几何形状对冠层内大尺度湍流运动的影响仍未得到解决。针对这一问题，对峡谷宽度为0.5 H ~ 1.5 H（H=立方体高度）、街道宽度为H ~ 1.5 H的情况进行了大涡模拟。在大峡谷宽度为1.5 H、街道宽度为1.5 H的情况下，在流向街道处观察到大尺度湍流运动。然而，在小峡谷宽度（0.5 H）的情况下，不会产生大尺度湍流运动。峡谷或街道宽度的大小影响大尺度湍流运动的产生。在大尺度湍流运动的作用下，当相邻的交叉通道处存在一对高动量和低动量运动时，偶尔会产生大尺度流向涡。这些流向涡维持大尺度湍流运动的产生。
Large-scale turbulent motions at a streamwise street coupled with spanwise motion in a canyon have been observed within an idealized urban canopy, but the effects of building array geometry on large-scale turbulent motions within the canopy remain unresolved. To address this issue, large eddy simulation is performed for the canyon width of 0.5H–1.5H(H= cube height) and the street width ofH–1.5H.In the case of a large canyon with (1.5H) and a large street width (1.5H), large-scale turbulent motions are observed at the streamwise street. However, large-scale turbulent motions are not generated in the case of a small canyon width (0.5H). The size of the canyon or street width affects the generation of the large-scale turbulent motions. When a pair of the high- and low-momentum motions are present at the adjacent intersection pathways under the generation of the large-scale turbulent motions, large-scale streamwise vortices are occasionally generated. These streamwise vortices maintain the generation of large-scale turbulent motions.