The effect of time-varying axial tension on VIV suppression for a flexible cylinder attached with helical strakes

Ma, Yanfei; Xu, Wence; Ai, H. X.; Wang, Yingying; Jia, Kun

doi:10.1016/j.oceaneng.2021.109981

Cited by 14 publications

(1 citation statement)

References 41 publications

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“…Therefore, the design of the passive devices as well as the underlying VIV suppression mechanism should be carefully studied before the engineering application. For offshore and wind engineering applications, helical strakes are the most common and widely used passive device [4,5]. As revealed by Zhou et al [6] and Huang [7], the helical configuration can prevent the correlation of vortex shedding along the spanwise direction and, therefore, the VIV suppression is independent of the oncoming flow direction.…”

Section: Introductionmentioning

confidence: 99%

Suppression of Vortex-Induced Vibration and Phase-Averaged Analysis of the Wake Generated by a Circular Cylinder Covered with Helical Grooves

Zhou

Sun

Lu³

et al. 2022

Fluids

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The effect of triple helical grooves on the suppression of vortex-induced vibration (VIV) of a circular cylinder was investigated experimentally in a wind tunnel over Reynolds number in the range of 1 × 104 < Re < 4 × 104. It was found that the helical grooves were effective in suppressing VIV with the peak amplitude reduction of approximately 36%. In addition, the lock-on region was also reduced. To explore the mechanism for the suppression of VIV, experiments on flow structures for a stationary grooved cylinder were also conducted in a wind tunnel at a free stream velocity U∞ of 4.37 m/s, corresponding to a Reynolds number based on the bare cylinder diameter of about 3500. The data were then analyzed using the phase-averaged method to evaluate the coherent vortex structures in the wakes. The results for the stationary grooved cylinder showed that the grooves weakened vortex shedding in the near wake. In addition, the grooves also reduced the drag coefficient by 6.6%. These results help explain the reduction of VIV using helical grooves.

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Section: Introductionmentioning

confidence: 99%

Suppression of Vortex-Induced Vibration and Phase-Averaged Analysis of the Wake Generated by a Circular Cylinder Covered with Helical Grooves

Zhou

Sun

Lu³

et al. 2022

Fluids

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Vortex-Induced Vibration Response Features of A Submarine Multi-Span Pipeline via Towing Tank Experimental Tests

Jia

et al. 2023

China Ocean Eng

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In offshore engineering, the phenomenon of free span often occurs, and the pipeline may have multiple free spans adjacent to each other, forming a multi-span pipeline. The interaction of different spans makes the structural vibration characteristics more complex, which may change the fatigue characteristics of the pipeline and affect the safety of the structure. In this paper, model tests were designed to explore the vortex-induced vibration (VIV) characteristics of multi-span pipelines and investigate the multi-span interaction mechanism. The experimental study mainly focused on the dynamic response of double-span pipelines, and further extended to triple-span pipelines, hoping that the results can be applied to more complex environment. The effects of span-length ratio, buried depth and axial force on VIV of the pipeline were investigated and discussed. The dynamic response of the pipeline varied with the span length. There was obvious interaction between different spans of multi-span pipelines, and the pipe-sediment interaction obviously affected the vibration characteristics of pipeline. The differences of pipeline burial depth and axial force changed the structural stiffness. With the increase of buried depth, the response amplitude presented a downward trend. The spanwise evolutions were asymmetric caused by the pipe-sediment interaction and multi-span interaction. The results can help to identify multi-span pipelines in engineering, and realize the prevention and control of free spans.

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Multispan classification methods and interaction mechanism of submarine pipelines undergoing vortex-induced vibration

Jia

et al. 2022

Applied Ocean Research

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The effect of time-varying axial tension on VIV suppression for a flexible cylinder attached with helical strakes

Cited by 14 publications

References 41 publications

Suppression of Vortex-Induced Vibration and Phase-Averaged Analysis of the Wake Generated by a Circular Cylinder Covered with Helical Grooves

Suppression of Vortex-Induced Vibration and Phase-Averaged Analysis of the Wake Generated by a Circular Cylinder Covered with Helical Grooves

Vortex-Induced Vibration Response Features of A Submarine Multi-Span Pipeline via Towing Tank Experimental Tests

Multispan classification methods and interaction mechanism of submarine pipelines undergoing vortex-induced vibration

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