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China Ocean Engineering 2024年第3期38卷 394-407页

作者： HU Ze-bo LIU Zhen LI Peng GUO Hai-yan REN Xiao-hui HOU Hao HAO Lian-hong College of Civil Engineering and Architecture Shandong University of Science and TechnologyQingdao 266590China Qingdao Key Laboratory of Marine Civil Engineering Materials and Structures Qingdao 266590China College of Engineering Ocean University of ChinaQingdao 266100China

In order to study the response law of vortex-induced vibration(VIV)of marine risers under the combined action of roughness and interference effects,and to reveal the coupling mechanism of roughness and interference effects on the riser,a VIV experiment of rough risers in tandem arrangement was conducted in a wave−current combined *** experiment characterized the risers’roughness by arranging different specifications of attachments on the surface of the *** rough risers with different roughness and smooth risers were arranged in tandem arrangement,with the rough risers arranged *** experimental results indicate that the suppression of the attachments on the downstream risers’vibration are more significant both in the CF and IL directions as the reduced velocity *** the downstream riser,the amplitude response of rough riser is more significantly weakened compared with the smooth one at high reduced *** the upstream risers,changes in the roughness and spacing ratio have an impact on their‘lock-in’*** the roughness of downstream risers is relatively large(0.1300)and the spacing between risers is small(S/D=4.0),the reduced velocity range of‘lock-in’region in the CF direction of upstream risers is obviously expanded,and the displacement in the‘lock-in’region is severer.

关键词： marine riser vortex-induced vibration tandem arrangement roughness interference effect

Experimental Study on vortex-induced vibration of Rough Risers with Coupling Interference Effect Under Side-by-Side Arrangement

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China Ocean Engineering 2024年第1期38卷 18-28页

作者： HU Ze-bo LIU Zhen LI Peng GUO Hai-yan WANG Shu-bing REN Xiao-hui HOU Hao WANG Ye-shuo College of Civil Engineering and Architecture Shandong University of Science and TechnologyQingdao 266590China Qingdao Key Laboratory of Marine Civil Engineering Materials and Structures Qingdao 266590China College of Engineering Ocean University of ChinaQingdao 266100China CHEC Dredging Co. LtdShanghai 200136China

A vortex-induced vibration(VIV)experiment of rough risers with coupling interference effect under a side-by-side arrangement was carried out in a wave-current combined *** roughness of the riser was characterized by arranging different specifications of surface attachments on the surface of the *** risers with three different roughnesses were arranged side by side with smooth risers to explore the VIV response of the riser under the combined action of roughness and interference effect,and to reveal the coupling mechanism between roughness and interference *** experimental results show that,compared with that of a smooth riser,the VIV of a rough riser under the coupling interference effect has a wider"lock-in"region,and the displacement decreases more significantly at a high reduced velocity,which is more likely to excite higher-order modes and frequency *** addition,the displacement response and frequency response of the smooth riser are not significantly affected by wake interference from the rough riser,which is caused by the decrease of the wake region due to the delay of the boundary layer separation point of the rough riser.

关键词： marine riser vortex-induced vibration side-by-side arrangement roughness interference effect

Coupled Cross-Flow/in-Line vortex-induced vibration Responses of a Catenary-Type Riser Subjected to Uniform Flows

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Journal of Ocean University of China 2024年第5期23卷 1202-1212页

作者： LI Xiaomin CAO Xi LI Fuheng YANG Zhiwen College of Engineering Ocean University of China College of Hydrodynamic Engineering Tianjin Research Institute for Water Transport EngineeringM.O.T

A three-dimensional numerical scheme was developed to investigate the vortex-induced vibration(VIV) of a catenarytype riser(CTR) in the in-line(IL) and cross-flow(CF) directions. By using the vector form intrinsic finite element method, the CTR was discretized into a finite number of spatial particles whose motions satisfy Newton's second law. The Van der Pol oscillator was used to simulate the effect of vortex shedding. The coupling equations of structural vibration and wake oscillator were solved using an explicit central differential algorithm. The numerical model was verified with the published results. The VIV characteristics of the CTR subjected to uniform flows, including displacement, frequency, standing wave, traveling wave, motion trajectory, and energy transfer, were studied comprehensively. The numerical results revealed that the multimode property occurs in the CF-and IL-direction VIV responses of the CTR. An increase in the flow velocity has slight effects on the maximum VIV displacement. Due to structural nonlinearity, the double-frequency relationship in the CF and IL directions is rarely captured. Therefore, the vibration trajectories display the shape of an inclined elliptical orbit. Moreover, the negative energy region is inconspicuous under the excitation of the uniform flow.

关键词： catenary-type riser vector form intrinsic finite element vortex-induced vibration wake oscillator equation

vortex-induced vibration Response Features of A Submarine Multi-Span Pipeline via Towing Tank Experimental Tests

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China Ocean Engineering 2023年第2期37卷 175-189页

作者： XU Wan-hai JIA Kun MA Ye-xuan SONG Zhi-you State Key Laboratory of Hydraulic Engineering Simulation and Safety Tianjin UniversityTianjin 300072China

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.

关键词： vortex-induced vibration submarine pipeline pipe-sediment interaction multi-span interaction

vortex-induced vibration of Two Parallel Risers:Experimental Test and Numerical Simulation

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Journal of Ocean University of China 2016年第2期15卷 247-253页

作者： HUANG Weiping ZHOU Yang CHEN Haiming Department of Ocean Engineering Shandong Key Laboratory of Ocean EngineeringEngineering CollegeOcean University of China Key Laboratory of Engineering Oceanography The Second Institute of OceanographySOA

The vortex-induced vibration of two identical rigidly mounted risers in a parallel arrangement was studied using Ansys-CFX and model *** vortex shedding and force were recorded to determine the effect of spacing on the two-degree-of-freedom oscillation of the *** was used to study the single riser and two parallel risers in 2–8D spacing considering the coupling *** of the limited width of water channel,only three different riser spacings,2D,3D,and 4D,were tested to validate the characteristics of the two parallel risers by comparing to the numerical *** results indicate that the lift force changes significantly with the increase in spacing,and in the case of 3D spacing,the lift force of the two parallel risers reaches the *** vortex shedding of the risers in 3D spacing shows that a variable velocity field with the same frequency as the vortex shedding is generated in the overlapped area,thus equalizing the period of drag force to that of lift *** can be concluded that the interaction between the two parallel risers is significant when the risers are brought to a small distance between them because the trajectory of riser changes from oval to curve 8 as the spacing is *** phase difference of lift force between the two risers is also different as the spacing changes.

关键词： vortex-induced vibration riser CFX drag force lift force

vortex-induced vibration of stay cable under profile velocity using CFD numerical simulation method

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Frontiers of Structural and Civil Engineering 2009年第4期3卷 357-363页

作者： Wenli CHEN Hui LI School of Civil Engineering Harbin Institute of TechnologyHarbin 150090China

vortex-induced vibration(VIV)of a stay cablesubjected to a wind profile is numerically simulatedthrough combining computational fluid dynamics(CFD)code CFX 10.0 and computational structural dynamics(CSD)code ANSYS 10.0.A stay cable with the inclinedangle of 30°is used as the numerical *** aprofile of mean wind speed,unsteady aerodynamic liftcoefficients of the cable have been analyzed in both timedomain and frequency domain when VIV *** indicate that the lift coefficient wave response of thestay cable under a wind profile is different from that of aninfinitely long cable under a uniform flow in water(i.e.,without consideration of profile)obtained by directnumerical *** oscillations can severelyaffect the unsteady aerodynamic frequencies,changeflow field distribution near the cable and affect the vortexshedding in the wake.

关键词： stay cable fluid-structure interaction numerical simulation vortex-induced vibration

vortex-induced vibration of pipes conveying fluid using the method of multiple scales

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Theoretical & Applied Mechanics Letters 2012年第2期2卷 64-67页

作者： Huliang Dai Lin Wang Department of Mechanics Huazhong University of Science and TechnologyWuhan 430074China Hubei Key Laboratory for Engineering Structural Analysis and Safety Assessment Wuhan 430074China

The nonlinear dynamics of supported pipes conveying fluid subjected to vortex-induced vibration is evaluated using the method of multiple scales. Frequency response portraits for different internal fluid velocities under lock-in conditions are obtained and the stability of steady-state responses is discussed. Results show that the internal fluid velocity has a prominent effect on the oscillation amplitude and that the steady-state responses incorporating unstable solutions in the lock-in region are also obtained. In addition, the effects of two kinds of fluctuating lift coefficients on the steady-state responses are compared with each other.

关键词： pipes conveying fluid vortex-induced vibration lock-in steady-state responses fluctuat-ing lift

A Numerical Investigation of vortex-induced vibration Response and Fatigue Damage for Flexible Cylinders Under Combined Uniform and Oscillatory Flow

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China Ocean Engineering 2020年第4期34卷 488-499页

作者： YUAN Yu-chao XUE Hong-xiang TANG Wen-yong State Key Laboratory of Ocean Engineering Shanghai Jiao Tong UniversityShanghai 200240China

vortex-induced vibration(VIV)for flexible cylinders under combined uniform and oscillatory flow is a challenging and practical issue in ocean *** this paper,a time domain numerical model is adopted to investigate the characteristics of cross-flow VIV response and fatigue damage under different combined flow ***,the adopted VIV model and fatigue analysis procedure are validated well against the published experimental results of a4-m cylinder model under pure oscillatory ***,forty-five combined flow cases of the same cylinder model are designed to reveal the VIV response characteristics with different non-dimensional oscillation period T^*and combined ratio *** combined flow cases are classified into three categories to investigate the effect of r on cylinder’s dynamic response,and the effect of T*is described under long and short period ***,fatigue analysis is carried out to investigate how the structural fatigue damage varies with the variations of r and T^*.The captured characteristics of structural response and fatigue damage are explained through the VIV mechanism analysis.

关键词： vortex-induced vibration fatigue damage flexible cylinders combined flow

The Effect of Internal Fluid on the Response of vortex-induced vibration of Marine Risers

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海洋工程：英文版 2004年第1期18卷 11-20页

作者：郭海燕王元斌傅强 College of Engineering

Based on Iwan′s wake oscillator model developed with the classical van der Pol equation, the differential equation for the response of the vortex-induced vibration (VIV) of the riser considering the effect of the internal flowing fluid and the external marine environmental condition is derived. The effect of the internal flowing fluid on the response of VIV of the riser is studied by means of the Finite Element Method. The results show that the effect of the internal fluid velocity on the VIV of the riser is strong when the natural frequency of the riser is close to the vortex shedding frequency. In addition, the increase of the top tension can decrease the sensitivity of the riser to the internal fluid velocity.

关键词： marine riser internal fluid vortex-induced vibration dynamic response

Hydrodynamics of A Flexible Riser Undergoing the vortex-induced vibration at High Reynolds Number

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China Ocean Engineering 2018年第5期32卷 570-581页

作者： REN Tie ZHANG Meng-meng FU Shi-xiao SONG Lei-jian State Key Laboratory of Ocean Engineering Shanghai Jiao Tong UniversityShanghai 200240China Collaborative Innovation Centre for Advanced Ship and Deep-Sea Exploration Shanghai 200240China Marine Design&Research Institute of China Shanghai 200011China Shanghai Electric Wind Power Group Shanghai 200030China

This study proposed a method to obtain hydrodynamic forces and coefficients for a flexible riser undergoing the vortex-induced vibration(VIV), based on the measured strains collected from the scale-model testing with the Reynolds numbers ranging from 1.34 E5 to 2.35 E5. The riser is approximated as a tensioned spatial beam, and an inverse method based on the FEM of spatial beam is adopted for the calculation of hydrodynamic forces in the cross flow(CF) and inline(IL) directions. The drag coefficients and vortex-induced force coefficients are obtained through the Fourier Series Theory. Finally, the hydrodynamic characteristics of a flexible riser model undergoing the VIV in a uniform flow are carefully investigated. The results indicate that the VIV amplifies the drag coefficient, and the drag coefficient does not change with time when the CF VIV is stable. Only when the VIVs in the CF and IL directions are all steady vibrations, the vortex-induced force coefficients keep as a constant with time, and under"lock-in" condition, whether the added-mass coefficient changes with time or not, the oscillation frequency of the VIV keeps unchanged. It further shows that the CF excitation coefficients at high frequency are much smaller than those at the dominant frequency, while, the IL excitation coefficients are in the same range. The axial distributions of the excitation and damping region at the dominant frequency and high frequency are approximately consistent in the CF direction, while, in the IL direction, there exists a great difference.

关键词： flexible riser vortex-induced vibration vortex-induced force excitation coefficient added-mass coefficient drag coefficient