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首页> 外文期刊>Building and Environment >LES study of windward-face-mounted-ribs' effects on flow fields and aerodynamic forces on a square cylinder
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LES study of windward-face-mounted-ribs' effects on flow fields and aerodynamic forces on a square cylinder

机译：在方形圆筒上的迎风面肋骨对流场和空气动力的影响

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Building-facade-mounted appurtenances are found to be effective for reducing wind loads on high-rise buildings. In this study, large eddy simulations (LES) are performed to investigate the effects of windward-face-mounted ribs on aerodynamic forces acting on a square cylinder of width D under smooth flow. The flow fields, wind pressure distributions and aerodynamic forces on different models are examined to clarify the underlying mechanism of the mitigation of wind load caused by vertical ribs. It is found that local recirculation forms in the front corner region, which greatly influences the flow separation and modifies the behavior of shear-layer flow. Three typical flow patterns around cylinders with different rib depths d are identified: full separation flow (0d/D = 0.105), periodic attachment flow (0.105d/D = 0.12), and steady attachment flow (d/D 0.12). The wake vortex structures, vortex shedding frequency and wind pressure distribution are significantly different under these three flow patterns. The flow field changes result in remarkable mitigation of mean drag (C) over bar (d) and fluctuating lift C'l. Optimal combinations of location b and depth d of ribs are also investigated. In these optimal cases, the shear layer first separates from the rib's leading edge and then passes by the cylinder's leading edge. The maximum reduction ratios of (C) over bar (d) and C'l reach 50% and 86%, respectively, when d/D = 0.12 and b/D = 0.10. An empirical configuration equation of the vertical ribs is finally proposed by fitting results of optimal combinations.
机译：发现建筑面前安装的附属物可有效地减少风量在高层建筑物上。在这项研究中，进行大型涡流模拟（LES）以研究迎风面安装肋对在平滑流动下作用在宽度D平方筒上的空气动力的空气动力的影响。检查不同模型上的流动场，风力压力分布和空气动力力，以阐明由垂直肋引起的风力负荷减轻的潜在机制。发现局部再循环在前角区中形成，这极大地影响了流动分离并改变了剪切层流动的行为。识别出具有不同肋深度D的圆柱体周围的三个典型流动图案：完全分离流（0

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