STUDY ON HYDROKINETIC ENERGY HARVESTING CHARACTERISTICS OF TANDEM-PARALLEL DOUBLE-COLUMN GROUPS DRIVEN BY VORTEX-INDUCED VIBRATION

Luo Zhumei; Chao Haocheng; Zhang Xiaoxu; Li Jun; Yang Tao

doi:10.19912/j.0254-0096.tynxb.2024-0321

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Acta Energiae Solaris Sinica ›› 2025, Vol. 46 ›› Issue (8) : 198-206. DOI: 10.19912/j.0254-0096.tynxb.2024-0321

STUDY ON HYDROKINETIC ENERGY HARVESTING CHARACTERISTICS OF TANDEM-PARALLEL DOUBLE-COLUMN GROUPS DRIVEN BY VORTEX-INDUCED VIBRATION

Luo Zhumei¹, Chao Haocheng², Zhang Xiaoxu¹, Li Jun³, Yang Tao⁴

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Abstract

The vortex-induced vibration （VIV） response characteristics and energy capture performance of two rigidly coupled three-cylinder groups arranged in tandem and parallel are investigated using a two-way flow-solid interaction numerical method. The hydrodynamic interference characteristics of the column-group structures with tandem and parallel arrangements, as well as the variation laws of energy capture magnitude and energy capture efficiency are analyzed in the range of the tandem vibrator spacing ratios Z= 8, 12 and 16, parallel group spacing ratios Z_y= 4, 6 and 8, and U^*=2-13. The results show that the tandem and parallel rigidly connected column groups exhibit more complex hydrodynamic characteristics and response results than that of the single set of tandem double column group, and the amplitude response of the double column group structure shows a transition zone from vortex-induced vibration to cyclonic vibration under the interaction of the gap flow and wake flow of the column group, as well as the effect of the reciprocal perturbation of the travelling column group. The wake vortices formed after the tandem column clusters are mainly shed in the form of 2P, 2S, and 2T, and fracture vortices and band vortices appear when the individual velocities decrease. As the inter-oscillator spacing ratio increases, the effect of mutual interference between column clusters decreases. The effect of spacing ratio on the captured energy of the tandem rigidly connected column clusters is insignificant, and the captured energy value and energy density of the column clusters increase with the increase of U^*, and the energy capture advantage of the upstream and downstream column clusters changes when the initial branch is converted to the upper end branch. The interference between parallel column clusters is realized after the tail-vortex interaction, so the interaction between the column clusters is weak, and the vortex-induced vibration response is almost the same as the single-column cluster response characteristics at Z_y=8.

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ocean energy / energy capture structure / vortex-induced vibration / fluid-structure interaction / energy capture characteristics / rigid connection

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Luo Zhumei, Chao Haocheng, Zhang Xiaoxu, Li Jun, Yang Tao. STUDY ON HYDROKINETIC ENERGY HARVESTING CHARACTERISTICS OF TANDEM-PARALLEL DOUBLE-COLUMN GROUPS DRIVEN BY VORTEX-INDUCED VIBRATION[J]. Acta Energiae Solaris Sinica. 2025, 46(8): 198-206 https://doi.org/10.19912/j.0254-0096.tynxb.2024-0321

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