Vortex-Induced Vibration Response Bifurcation Analysis of Top-Tensioned Riser Based on the Model of Variable Lift Coefficient

Wang, Yuancen; Wu, Zhiqiang; Zhang, Xiangyun

doi:10.1155/2018/6491517

Cited by 3 publications

(2 citation statements)

References 18 publications

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“…where A s is the riser crosssectional area (A s � π 2 (D 2 − d 2 )/4; D is the outer diameter and d is the inner diameter of the riser); ρ s and ρ w are the riser material density and seawater density, respectively; f top is the top tension coefficient, and L is the length of the riser; m r is the riser quality per unit length (m r � πρ s (D 2 − d 2 )/4); and m f is the riser fluid quality per unit length (m f � ρ f πd 2 /4), m a is the additional quality per unit length (m a � C a ρ w πD 2 /4 in which C a is the added mass coefficient), and C is structural damping [25,29]. In this paper, the Van der Pol equation is used to represent the vibration characteristics of the wake vortex shedding.…”

Section: Dynamical Modelmentioning

confidence: 99%

Research on Bifurcation Response for Vortex-Induced Vibration of Top Tension Riser in Shear Flow

Wang

Zhang

2019

Mathematical Problems in Engineering

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The top tension riser (TTR) is one of the most frequently used equipment in deep-sea petroleum engineering. At present, the research methods of its vortex-induced vibration (VIV) are mainly focused on finite element analysis and experiment. The understanding of its various nonlinear mechanical mechanisms would be inadequate via limited numerical or experimental studies rather than nonlinear analysis of its rich dynamics. Based on the Van der Pol wake oscillator model, the nonlinear dynamic model of the TTR subject to shear flow VIV is established. The proposed model includes the fluid-structure interaction of the TTR under shear flow. Dynamic behavior of the TTR in association with the variation of flow velocity is investigated. The dynamic behavior is simulated by computing the local maximum displacement response via the fifth-order Galerkin discretization. The Poincare map is then utilized to quantify the dynamic property of TTR under each individual flow velocity, which helps identifying the bifurcation path of the nonlinear system. The time history, phase diagram, FFT spectrum, and envelope diagram about the riser VIV at typical flow velocity in different regions of the bifurcation diagram are then given. It is found that the VIV response of the TTR depicts the Hopf bifurcation phenomena with bistable characteristics. Together with the structural eigen-analysis and the three-dimensional spectrum contour, the main dynamic features of the TTR in shear flow are more comprehensively understood. Such understandings may provide new ideas and references for the design and optimization of the riser structural parameters.

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Section: Dynamical Modelmentioning

confidence: 99%

Research on Bifurcation Response for Vortex-Induced Vibration of Top Tension Riser in Shear Flow

Wang

Zhang

2019

Mathematical Problems in Engineering

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“…et al [11] created a vibration model considering multiphase flow and analyzed the natural frequency of a marine riser. Wang Y. et al established models to study the vortexinduced vibration bifurcation response of TTR under variable lift coefficient and shear flow [12,13]. These studies were based on the same assumption: the tension force of the riser is constant.…”

Section: Introductionmentioning

confidence: 99%

Frequency Response Function and Design Parameter Effects of Hydro-Pneumatic Tensioner for Top-Tensioned Riser

et al. 2021

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The top-tensioned riser is an important equipment in offshore oil and gas development. The hydro-pneumatic tensioner is an essential device to ensure the safety of the top-tensioned riser. To investigate the dynamic performance of the marine platform hydro-pneumatic tensioner, this paper proposed a first-order Taylor approximation method and created the frequency response function of the hydro-pneumatic tensioner. According to the frequency response function, the hydro-pneumatic tensioner is a first-order spring-mass system. With the given parameters, the system stiffness coefficient is 66.1 kN/m, the natural annular frequency is 20.99 rad/s and the damping ratio is 2.23 × 10−4. The effects of the high-pressure accumulator, low-pressure accumulator, hydraulic cylinder and pipeline design parameters on the stiffness coefficient, natural annular frequency and damping ratio are analyzed. The stiffness coefficient can be increased by (1) increasing the high-pressure accumulator pressure and reducing the high-pressure accumulator volume; (2) increasing the pressure of the low-pressure accumulator and reducing the low-pressure accumulator volume; (3) increasing the piston diameter; and vice versa. The natural annular frequency can be increased by: (1) increasing the high-pressure accumulator pressure and reducing the high-pressure accumulator volume; (2) increasing the pressure of the low-pressure accumulator and reducing the low-pressure accumulator volume; (3) increasing the piston diameter; and vice versa. The damping ratio can be increased by increasing the pipeline length and reducing the pipeline inner diameter.

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Modelling and harnessing energy from flow-induced vibration, particularly VIV and galloping: An explicit review

Francis,

Swain

2024

Ocean Engineering

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Vortex-Induced Vibration Response Bifurcation Analysis of Top-Tensioned Riser Based on the Model of Variable Lift Coefficient

Cited by 3 publications

References 18 publications

Research on Bifurcation Response for Vortex-Induced Vibration of Top Tension Riser in Shear Flow

Research on Bifurcation Response for Vortex-Induced Vibration of Top Tension Riser in Shear Flow

Frequency Response Function and Design Parameter Effects of Hydro-Pneumatic Tensioner for Top-Tensioned Riser

Modelling and harnessing energy from flow-induced vibration, particularly VIV and galloping: An explicit review

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