Dynamic response of five-riser group subjected to vortex-induced vibration in a cylindrical arrangement configuration

Liu, Yu; Li, Peng; Wang, Yu; Chen, Xin; Ren, Xiaohui; Lou, Min

doi:10.1016/j.oceaneng.2022.111271

Cited by 7 publications

(2 citation statements)

References 39 publications

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“…The latest research [21][22][23][24][25] is focused on the dynamics of three and four flexible structures in tandem and in side-by-side positions, including experimental, numerical results and the identification of energy harvesting perspectives [23]. More advanced arrangements of circular structures investigated to date include: three objects placed in a triangle, studied in [26]; a set of five risers in a cylindrical arrangement [27]; and the use of up to eight control cylinders around protected circular structures, in order to mitigate vortex-induced loads [28]. A separate branch of studies considers the flow over a structure placed close to a plane boundary [29].…”

Section: Introductionmentioning

confidence: 99%

Flow-Induced Forces for a Group of One Large and Several Small Structures in the Sheared Turbulent Flow

Annapeh

Kurushina

2023

Fluids

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Evaluating the hydrodynamic force fluctuations acting on each structure in a group of subsea objects of different cross-section shapes, sizes and relative positions represents a challenge due to the sensitivity of the vortex shedding process, especially for a variety of sheared flows. The present study uses the numerical 2D computational fluid dynamics model to estimate the flow-induced forces on a group of small circular and D-shaped cylinders in the linear and parabolic sheared flow, which are placed in proximity to a larger structure of the squared cross-section. This allows us to evaluate loads, which are affected by the presence of subsea equipment located on the seabed. The average Reynolds number of the considered linear flow profile is 3900, while the parabolic flow profile has the maximum Reynolds number of 3900. The k-ω SST turbulence model is used for simulations. The work demonstrates the effect of the cross-sectional shape of smaller cylinders on hydrodynamic coefficients, explores the effect from the spacing in between the structures and highlights differences between loads in the linearly sheared and parabolic flow. The results obtained show that the presence of the squared cylinder notably influences the mean drag coefficient on the first cylinder, for both circular and D-shaped cylinders. The parabolic sheared flow profile in this series leads to the highest mean drag and the highest amplitudes of the fluctuating drag and lift coefficients.

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Section: Introductionmentioning

confidence: 99%

Flow-Induced Forces for a Group of One Large and Several Small Structures in the Sheared Turbulent Flow

Annapeh

Kurushina

2023

Fluids

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“…Mittal and Prasanth [18] applied the moving mesh method and the finite element method to simulate the vibration caused by the fluid flow on a circular cylinder. Several engineering structures are at risk of fatigue damage caused by vortex-induced vibration, including nano-devises and nano-production [19][20][21], marine risers [22], heat exchanger tubes [23][24][25], robotic arms, and etc Pontes et al [26] studied the phenomenon of current-induced vibrations on a cylinder with varying mass ratios. Momtaz and Farshidianfar [27] studied the phenomenon of vortex vibrations and the effect of using control cylinders arranged in a variety of arrangements on the formation of vortices, lift and drag coefficients, and amplitude of oscillations behind cylindrical cylinders positioned on a flexible substrate and exposed to uniform fluid flow.…”

Section: Introductionmentioning

confidence: 99%

A semi-analytical study on fluid-induced nonlinear dynamic behavior of the flexible robotic arms

Chen

Qiu

2022

Eng. Res. Express

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The accuracy and performance of a robot arm is reduced when placed in a fluid environment due to inductive vibrations caused by drag forces created by surrounding fluids. Accordingly, in this research, the fluid-induced nonlinear dynamic behavior of the robot flexible arm is investigated semi-analytically. In order to model the induced vibrations in the robot arm, the equations governing the transverse vibrations of the arm are derived using the nonlinear Euler-Bernoulli beam theory and taking into account the force due to the fluid surrounding the arm. A differential equation is used to calculate the force exerted on the arm by the surrounding fluid in terms of the frequency of the vortices and the deflection of the robotic arm. After the differential equations governing the forced dynamic behavior of the robot arm have been extracted, an appropriate numerical method will be applied to analyze the effect of system parameters such as the geometric and mechanical characteristics of the arm, fluid velocity, etc. on the response of forced vibrations and natural frequencies of the robot arm. According to the results, as the fluid velocity increases, the inertial forces increase and cannot be ignored. The vibrations amplitude of the system increases abruptly at higher fluid velocity, and the oscillations of the system stabilize. When the nondimentional velocity of the fluid is equal to 2, the amplitude of the stable oscillations is equal to 0.2 of the thickness of the arm, which is higher than the amplitude of free vibrations. This range of fluid velocity is known as the lock-in zone.

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Numerical Simulation of Flow-Induced Forces on Subsea Structures in a Group Under Uniform and Sheared Flow

Annapeh

Kurushina

2022

Mechanisms and Machine Science

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Dynamic response of five-riser group subjected to vortex-induced vibration in a cylindrical arrangement configuration

Cited by 7 publications

References 39 publications

Flow-Induced Forces for a Group of One Large and Several Small Structures in the Sheared Turbulent Flow

Flow-Induced Forces for a Group of One Large and Several Small Structures in the Sheared Turbulent Flow

A semi-analytical study on fluid-induced nonlinear dynamic behavior of the flexible robotic arms

Numerical Simulation of Flow-Induced Forces on Subsea Structures in a Group Under Uniform and Sheared Flow

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