Experimental Study on Out-of-Plane Vortex-Induced Vibration Response of a π-Shaped Jumper in Uniform Flow

doi:10.16183/j.cnki.jsjtu.2024.255

Abstract

Abstract:

As a core component of underwater production facilities, subsea jumpers are prone to vortex-induced vibration (VIV) in the ocean currents, which can cause structural fatigue damage. However, limited experimental research on VIV of jumpers has left a gap in understanding the VIV response characteristics. To address this gap, an out-of-plane VIV experiment of a π-shaped jumper is conducted in uniform flow, aiming to mechanistically investigate its VIV behavior. Strain data under different flow velocities are analyzed using common methods such as modal analysis and wavelet transform. The results show that the π-shaped jumper exhibits dominant frequency ratios of 3 and 4 between the in-line (IL) and cross-flow (CF) directions, differing from those of a single riser in out-of-plane uniform flow. As flow velocity increases, the strain amplitudes in both IL and CF directions follow a variation pattern resembling an inverted quadratic curve under the dominant mode, with their peak values coinciding at the same flow velocity.

Key words: π-shaped jumper, vortex-induced vibration (VIV), experimental study, strain

CLC Number:

P756.2

LIN Yujia, ZHANG Mengmeng, FU Shixiao, DENG Pengqian, BAI Yingli, XU Yuwang. Experimental Study on Out-of-Plane Vortex-Induced Vibration Response of a π-Shaped Jumper in Uniform Flow[J]. Journal of Shanghai Jiao Tong University, 2026, 60(3): 387-398.

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参数	取值
模型跨度/m	4.407
模型高度/m	1.170
各分段长度比值	1∶2∶3.6∶2∶1
单位长度质量/(kg·m^-1)	1.45
质量比	2.05
弯曲刚度/(N·m²)	50.804
拉伸刚度/kN	951
水动力外径/mm	30.31
结构阻尼系数	0.055
第1阶固有频率/Hz	0.97

OP方向				IP方向
试验 f_OP1/Hz	数值 f_OP1/Hz	误差/%		试验 f_IP1/Hz	数值 f_IP1/Hz	误差/%
0.87	0.88	1.15		2.37	2.40	1.27

阶数	f_OP/Hz	f_IP/Hz
1	0.884	2.398
2	2.037	4.559
3	5.893	8.393
4	8.669	10.002

v/(m·s^-1)	f_CF/Hz	f_IL/Hz	f_IL/f_CF
0.18	1.08	2.16	2.0
0.22	1.51	1.51	1.0
0.26	1.60	6.32	4.0
0.30	1.92	6.30	3.3
0.34	2.10	6.42	3.0
0.38	2.25	2.25	1.0
0.42	2.35	8.12	3.5
0.46	2.49	8.24	3.3
0.50	2.62	8.39	3.2
0.54	2.66	8.58	3.2
0.58	3.26	6.51	2.0
0.62	3.35	6.71	2.0
0.66	3.43	6.89	2.0
0.70	3.52	7.04	2.0