Volume 09,Issue 01

Numerical Simulation of Vortex-induced Vibration in Pipes with Different Overhang Heights

Authors

Kaijie Zheng, Lin Wang

Abstract
Resonance due to vortex-induced vibration is the leading cause of fatigue damage in submarine-suspended span pipelines working in harsh environments. The vortex-induced vibration of the pipeline at different overhang heights is investigated using a two-dimensional slicing method, and fourth-order Runge-Kutta solves the pipeline vibration equations. The calculated results show that the root means the square value of the lift coefficient and the mean value of the drag coefficient decrease with the increase of the gap ratio, and gradually stabilize when the gap ratio is greater than 1.2. When the gap ratio is less than 1, the lift force at the upper and lower ends of the pipe is not equal, and the time horizon of the lift and drag coefficients is disordered, with peaks of different amplitudes; the dominant frequency of the pipe vibration is the first-order natural frequency, but the influence of the near-wall surface, the vortex on both sides of the pipe is not completely discharged, resulting in multi-frequency vibration in the downstream direction of the pipe.

Keyword: Gap ratio, Vortex-induced vibration, Near wall, Vibration characteristics.

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