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

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Journal of Vibration and Shock ›› 2022, Vol. 41 ›› Issue (3) : 278-286.

WEI Yuhan, JI Chunning, XU Dong, CHEN Weilin

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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.

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Flow-induced vibration / Equilateral triangular prism / The balanced position / Quasi-steady theory

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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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