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LES prediction of aerodynamics and coherence analysis of fluctuating pressure on box girders of long-span bridges

机译：大跨度桥梁箱梁的空气动力学LES预测和脉动压力相干分析

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The flow field around a box girder of a large span cable-stayed bridge, under Reynolds number of 1.27 x 10(5), is computed by using three-dimensional large eddy simulation (LES). The flow results under various angles of attack are obtained and compared with wind tunnel tests. The distribution of mean and RMS value of pressure around the girder surface are also provided. Investigation on fluctuating pressure on the girder surface is carried out through power spectrum density (PSD) and spatial coherent analysis. The research shows that the flow structure around the girder is characterized by the flow separated from the girder windward corners, reattachment on the girder upper surface, the primary vortices shedding within the reattachment region, vortex convection and alternatively shedding in the wake. The fluctuating pressure on the girder surface is clearly dominated by the presence of primary vortices. It is found that the primary vortices are not shed synchronously in girder span-wise direction, and the vortex shedding energy is concentrated on a narrow band of frequency. The fluctuating pressure on the girder lower surface, on the area upstream the reattachment region on girder upper surface is in phase, which is out of phase with that on the upper surface of leeward air fairing and area close to the upper leeward corner. The recognized flow mechanism may help to optimize the aerodynamic shape of girder cross section for long-span bridges against wind loading. (C) 2014 Elsevier Ltd. All rights reserved.
机译：雷诺数为1.27 x 10（5）的大跨度斜拉桥箱梁周围的流场是通过三维大涡模拟（LES）计算的。获得了各种迎角下的流动结果，并将其与风洞试验进行了比较。还提供了梁表面周围压力的平均值和RMS值的分布。通过功率谱密度（PSD）和空间相干分析，对梁表面的波动压力进行了研究。研究表明，围绕大梁的流动结构的特征是：与大梁的迎风角分开的流动，在大梁上表面的重新附着，在重新附着区域内初级涡旋脱落，涡旋对流以及尾流交替脱落。在大梁表面的波动压力显然是由主要涡旋的存在所决定的。发现主旋涡并没有在大梁跨度方向同步脱落，并且涡旋脱落能量集中在狭窄的频带上。在大梁上表面再连接区域上游区域的大梁下表面上的波动压力是同相的，该压力与下风整流罩的上表面上的压力和靠近上风向角的区域上的压力是异相的。公认的流动机制可能有助于优化大跨度桥梁抗风荷载的大梁横截面的空气动力学形状。 （C）2014 Elsevier Ltd.保留所有权利。

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