ENERGY CAPTURE ANALYSIS OF THREE-DIMENSIONAL VORTEX-INDUCED VIBRATION OF LOW-SPEED WATER FLOW BASED ON ENTROPY PRODUCTION THEORY

Li Jun; Luo Zhumei; Guo Tao; Yang Tao; Gao Suoming

doi:10.19912/j.0254-0096.tynxb.2022-0932

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Acta Energiae Solaris Sinica ›› 2023, Vol. 44 ›› Issue (6) : 45-52. DOI: 10.19912/j.0254-0096.tynxb.2022-0932

ENERGY CAPTURE ANALYSIS OF THREE-DIMENSIONAL VORTEX-INDUCED VIBRATION OF LOW-SPEED WATER FLOW BASED ON ENTROPY PRODUCTION THEORY

Li Jun¹, Luo Zhumei¹, Guo Tao², Yang Tao¹, Gao Suoming³

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Abstract

In this paper, the rigid cylinder is used as the energy-capture structure, and the three-dimensional vortex-induced vibration of the energy-captured system in the low-speed water flow environment is simulated by the strong fluid-solid coupling numerical method. The captured energy quantity and the energy capture efficiency of the capturing structure is analyzed in the range of resonance reduction velocity（U_r=2-12）. To obtain the effect of the three-dimensional wake of the energy captured structure on the captured energy, the entropy production theory and the wake characteristics are used to capture the energy loss source and distribution of the wake vortex of the energy capture structure, and the relationship between capture energy and wake dissipation under different vibration branches are obtained. The results show that the energy loss analysis based on the entropy production theory can accurately capture the energy dissipation trend of the energy-harvesting structure. The viscous entropy production mainly occurs on the cylindrical surface, and the turbulent entropy occurs in the wake region, where the dissipation rate is more significant. With the increase of the reduced velocity, the kinetic energy of water captured by the energy capture structure in the upper branch increases, the viscous entropy loss on the cylinder surface and the turbulent entropy production loss around the cylinder and in the wake region also increases, and the viscous entropy production loss on the surface of the energy capture structure increases. The increase of turbulent entropy production loss in the wake region is the main reason for the decrease in energy capture efficiency.

Key words

ocean energy / energy capture structure / vortex-induced vibration / fluid-structure interaction / energy dissipation / entropy generation theory

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Li Jun, Luo Zhumei, Guo Tao, Yang Tao, Gao Suoming. ENERGY CAPTURE ANALYSIS OF THREE-DIMENSIONAL VORTEX-INDUCED VIBRATION OF LOW-SPEED WATER FLOW BASED ON ENTROPY PRODUCTION THEORY[J]. Acta Energiae Solaris Sinica. 2023, 44(6): 45-52 https://doi.org/10.19912/j.0254-0096.tynxb.2022-0932

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