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Numerical studies of the suppression of vortex-induced vibrations of twin box girders by central grids

机译：中心网格抑制双箱梁涡激振动的数值研究

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摘要

A numerical study based on a delayed detached eddy simulation (DDES) is conducted to investigate the aerodynamic mechanism behind the suppression of vortex-induced vibrations (VIVs) of twin box girders by central grids, which have an inhibition effect on VIVs, as evidenced by the results of section model wind tunnel tests. The mean aerodynamic force coefficients with different attack angles are compared with experimental results to validate the numerical method. Next, the flow structures aroundY the deck and the aerodynamic forces on the deck are analyzed to enhance the understanding of the occurrence of VIVs and the suppression of VIVs by the application of central grids. The results show that shear layers are separated from the upper railings and lower overhaul track of the upstream girder and induce large-scale vortices in the gap that cause periodical lift forces of large amplitude acting on the downstream girder, resulting in VIVs of the bridge clerk. However, the VIVs are apparently suppressed by the central grids because the vortices in the central gap are reduced into smaller vortices and become weaker, causing slightly fluctuating lift forces on the clerk. In addition, the mean lift force on the clerk is mainly caused by the upstream girder, whereas the fluctuating lift force is mainly caused by the downstream girder.
机译：进行了基于延迟分离涡模拟（DDES）的数值研究，以研究通过中央网格抑制双箱梁的涡流诱发振动（VIV）背后的空气动力学机制，这对VIV具有抑制作用，这证明了截面模型风洞测试的结果。将不同攻角的平均空气动力系数与实验结果进行比较，以验证数值方法的有效性。接下来，分析甲板周围的流动结构和甲板上的空气动力，以增强对VIV发生的理解和通过中央网格的应用来抑制VIV的能力。结果表明，剪力层与上游梁的上部围栏和下部大修轨道分开，并在缝隙中引起大范围的涡旋，从而引起周期性的大幅度升力作用于下游梁，从而产生桥梁文员的VIV。 。但是，由于中心间隙中的涡流被减小为较小的涡流并变得更弱，因此VIV显然被中心网格抑制了，从而引起了对职员的举升力的波动。另外，对职员的平均升力主要是由上游梁引起的，而波动的升力主要是由下游梁引起的。

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