不同迎流攻角下正三角柱流致振动数值模拟研究

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振动与冲击 ›› 2022, Vol. 41 ›› Issue (3) : 278-286.

论文

卫昱含，及春宁，许栋，陈威霖

作者信息 +

Numerical simulation for flow-induced vibration of regular triangular column under different angles of attack

WEI Yuhan, JI Chunning, XU Dong, CHEN Weilin

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文章历史 +

摘要

采用嵌入式迭代浸入边界法对不同迎流攻角下正三角柱的流致振动进行了二维数值模拟研究，其中迎流攻角为α=0°-60°（α=60°时三角柱顶点迎流），雷诺数为Re=100，质量比为m*=5和折合流速为Ur=2-20。详细分析了不同迎流攻角下横流向振幅、振动频率、水动力系数、升力与位移的相位差以及尾涡模式随折合流速变化的情况。结果发现，三角柱振动随迎流攻角表现为三种不同的振动模式：涡振-驰振联合模式（α=0°-15°）、涡振-驰振分离模式（α=20°-22.5°）和涡振模式（α=25°-60°）。选取α=0°、20°、60°三个迎流攻角详细论述了不同模式下三角柱的振动特性。此外，还发现虽然三角柱在迎流攻角α=0°时关于来流方向对称，三角柱的平衡位置在某些折合流速下出现了偏移，该现象与升力中偶次谐波分量的出现有关。最后，应用准稳态分析得到了驰振出现的攻角范围，结果与数值模拟的情况吻合较好，说明准稳态分析可以准确预测三角柱驰振的攻角范围。

Abstract

The flow induced vibration of a equilateral triangular prism with different angles of attack is studied by using the immersed boundary method. The angles of attack is α=0°-60° (a vertex of the triangular prism faces the flow when α=60°), the Reynolds number is Re=100, the mass ratio is m*=5, and the reduced velocity is Ur=2-20. The transverse vibration amplitude, the vibration frequency, the hydrodynamic coefficients, the phase difference between the lift and displacement and the wake pattern are investigated with different angles of attack and reduced velocities. Results show that there are three different vibration modes: the combined vortex-induced vibration (VIV) and galloping in the range of α=0°-15°, the separated VIV and galloping at α=20°-22.5°, and VIV in the range of α=25°-60°. Three angles of attack of α=0°, 20° and 60° are selected in this paper to discuss the flow-induced vibration characteristics of the triangular prism. It is found that the lateral shift of the balanced position of the triangular prism is non-zero at some Ur when α=0°, and the occurrence of this phenomenon is related to the even harmonic component of the lift. Moreover, the α range of galloping is further investigated by using the quasi-steady theory. The results show good agreement with the numerical simulation, which indicates that the quasi-steady theory can accurately predict the α range of galloping of the triangular prism.

导出引用

卫昱含，及春宁，许栋，陈威霖. 不同迎流攻角下正三角柱流致振动数值模拟研究[J]. 振动与冲击, 2022, 41(3): 278-286

WEI Yuhan, JI Chunning, XU Dong, CHEN Weilin. Numerical simulation for flow-induced vibration of regular triangular column under different angles of attack[J]. Journal of Vibration and Shock, 2022, 41(3): 278-286

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