Coupling effects of top-end dynamic boundary with a planar trajectory of “8” on three-dimensional VIV characteristics

Zhang, Cheng; Kang, Zhuang; Ni, Wenchi; Xie, Zhihua

doi:10.1016/j.marstruc.2022.103304

Cited by 5 publications

(8 citation statements)

References 34 publications

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“…The testing devices from our previous study [13] are introduced here as Figure 1. The total testing structure is arranged vertically, with the top end connected to the crane.…”

Section: Test Devicesmentioning

confidence: 99%

“…Then, the model displacements of the riser are obtained using the mode superposition method. The arrangement of the strain gauges is displayed in Figure 2b; its design principle refers to [13]. The scale parameters of the composite riser model are described in Table 1.…”

Section: Test Modelmentioning

confidence: 99%

“…In addition to the mode superposition method, other approaches are applied to process the experimental data, e.g., band pass filter, Fourier transform, and wavelet transform, and have been validated by Zhang et al [13,26].…”

Section: Data Processingmentioning

confidence: 99%

“…Besides the steady ocean current, the VIV of a riser system is affected by other complex factors, e.g., floater motions. The surrounding equivalent flow velocity and riser tension are influenced by the combined effect of the floater motion and various marine environmental loads, which undergo time-varying characteristics [13]. The real-time relative flow velocity and the tension of risers are the critical parameters for VIV.…”

Section: Introductionmentioning

confidence: 99%

“…The effects of double-degree-of-freedom (2DOF) excitations on riser VIV have also been considered. Zhang et al [13,26] performed a series of model tests on the unsteady VIV of a riser model in uniform flow, affected by single-degree-of-freedom (1DOF) and 2DOF harmonic top-end excitations stimulated by servo motors. They found that the cross-flow (CF) component of the dynamic boundary induces oscillatory characteristics in in-line (IL) VIV, while the IL dynamic boundary component promotes the counterpart of CF VIV.…”

Section: Introductionmentioning

confidence: 99%

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Coupling Effects of a Top-Hinged Buoyancy Can on the Vortex-Induced Vibration of a Riser Model in Currents and Waves

Yu,

Zhang,

Zhang

2024

JMSE

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In order to investigate the effects of the top-end dynamic boundary of risers caused by floater motions on their vortex-induced vibration (VIV) characteristics, a combined model comprising a buoyancy can with a relatively simple structural form and a riser is taken as the research object in the present study. The aspect ratios of the buoyancy can and the riser model are 5.37 and 250, respectively. A set of experimental devices is designed to support the VIV test of the riser with a dynamic boundary stimulating the vortex-induced motion (VIM) of the buoyancy can under different uniform flow and regular wave conditions. Several data processing methods are applied in the model test, i.e., mode superposition, Euler angle conversion, band pass filter, fast Fourier transform, and wavelet transform. Based on the testing results, the effect of low-frequency VIM on the high-frequency VIV of the riser is discussed in relation to a single current, a single wave, and a combined wave and current. It is found that the coupling effect of VIM on the riser VIV presents certain orthogonal features at low current velocities. The effect of the cross-flow VIM component on VIV is far more prominent than that of its counterpart, the in-line VIM, with increasing flow velocity. The VIM in the combined wave–current condition significantly enhances the modulation of vibration amplitude and frequency, resulting in larger fluctuation peaks of vibration response and further increasing the risk of VIV fatigue.

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“…The testing devices from our previous study [13] are introduced here as Figure 1. The total testing structure is arranged vertically, with the top end connected to the crane.…”

Section: Test Devicesmentioning

confidence: 99%

Section: Test Modelmentioning

confidence: 99%

Section: Data Processingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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