Numerical simulation study on a dual-cylinder vortex-induced vibration power generation device considering the influence of mass ratio

WANG Jiazheng1, SUN Hongyuan1, LIN Haihua1, XU Qiang2, LIU Dexin1, MIAO Jin1

Journal of Vibration and Shock ›› 2024, Vol. 43 ›› Issue (14) : 8-17.

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Journal of Vibration and Shock ›› 2024, Vol. 43 ›› Issue (14) : 8-17.

Numerical simulation study on a dual-cylinder vortex-induced vibration power generation device considering the influence of mass ratio

  • WANG Jiazheng1,SUN Hongyuan1,LIN Haihua1,XU Qiang2,LIU Dexin1,MIAO Jin1
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Abstract

The tandem circular cylinder vortex-induced vibration power generation device is a novel energy device that harnesses the power of ocean currents for electricity generation. In this paper, Fluent was used to simulate the hydrodynamic characteristics of the tandem circular cylinder vortex-induced vibration power generation device. The flow-structure coupling simulation of the cylinder oscillator was achieved using UDF and dynamic mesh technology to analyze the vortex-induced vibration characteristics of the cylinder oscillator. This paper first conducted grid and time step independence verification to demonstrate the accuracy of the numerical simulation. Subsequently, the vortex-induced vibration characteristics of the cylinder oscillator were analyzed from three aspects: displacement time history, amplitude, and frequency. Through the analysis of the energy harvesting power and energy conversion efficiency of the cylinder oscillator in a tandem circular cylinder vortex-induced vibration power generation device with equal mass ratio, the energy capture characteristics of the tandem circular cylinder vortex-induced vibration power generation device were studied. The research indicates that for downstream cylinders with a mass ratio of m*=3, 4, and 5, the transverse amplitude gradually becomes greater than that of the upstream cylinder with an increase in reduced velocity. The dimensionless transverse amplitude of the tandem circular cylinder oscillators under different mass ratios shows a trend of increasing with the increase in reduced velocity and then decreasing. When the mass ratio is m*=4, the energy conversion efficiency of the upstream and downstream cylinders is the highest, at 32.6% and 22.8%, respectively. When the mass ratio is m*=5, the energy conversion efficiency of the downstream cylinder is the highest, at 30.5%.

Key words

ocean current energy / fluid structure interaction / vortex-induced vibration / energy acquisition / numerical simu-lation

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WANG Jiazheng1, SUN Hongyuan1, LIN Haihua1, XU Qiang2, LIU Dexin1, MIAO Jin1. Numerical simulation study on a dual-cylinder vortex-induced vibration power generation device considering the influence of mass ratio[J]. Journal of Vibration and Shock, 2024, 43(14): 8-17

References

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