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Investigation of flow visualization around linked tall buildings with circular sections

机译：圆形截面链接的高层建筑周围的流动可视化研究

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This study investigated the wind environment around buildings by visualizing the wind flow patterns of linked buildings (LB), in which two buildings with circular sections are attached through linking members. Particle image velocimetry was used to measure the wind flows around LB models with different gap distances between the buildings. Proper orthogonal decomposition (POD) analysis was applied to identify velocity and vorticity patterns. The results showed that when the two buildings have a side-by-side arrangement (alpha = 0 degrees), and the gap distance is small, the POD using velocity indicates a single vortex street and biased flow in the gap, whereas that using vorticity suggests a contracted flow in the gap. When the gap distance is large, two independent vortex streets appear in the first mode of both POD, with the POD using vorticity confirming the presence of re-circulation zones in the wake region. In a tandem arrangement (alpha = 0 degrees), the shear layer street occurring in the upstream building affects the entire LB system, and the POD analysis using vorticity shows that the shear layer cannot surround the downstream building if the gap distance is large. The link, gap distance, and elevation have little impact on the flow patterns when alpha = 0 degrees. However, these factors affect the flow patterns when alpha = 0 degrees. In addition, when the gap distance is equal to two-thirds of the building breadth and alpha = 0 degrees, the two shear layer streets joined behind the space between the two buildings and produced the maximum mean wind speed around the building compared to other cases.
机译：这项研究通过可视化链接建筑物（LB）的风流模式研究了建筑物周围的风环境，其中，两个具有圆形截面的建筑物通过链接构件相连。粒子图像测速仪用于测量建筑物之间不同距离的LB模型周围的风。适当的正交分解（POD）分析用于识别速度和涡度模式。结果表明，当两座建筑物并排排列（α= 0度）并且间隙距离较小时，使用速度的POD表示单个涡街和间隙中的偏流，而使用涡度表示表明差距缩小。当间隙距离较大时，两个POD的第一个模式中会出现两个独立的涡流道，其中POD使用涡流确认了尾流区域中存在回流区。在串联排列（α= 0度）中，上游建筑物中出现的剪切层街道影响整个LB系统，使用涡度的POD分析表明，如果间隙距离较大，则剪切层无法围绕下游建筑物。当alpha = 0度时，连接，间隙距离和高程对流型几乎没有影响。但是，当alpha = 0度时，这些因素会影响流型。此外，当间隙距离等于建筑物宽度的三分之二且alpha = 0度时，与其他情况相比，两个剪切层街道在两个建筑物之间的空间后面汇合，并产生了建筑物周围的最大平均风速。

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