Analytical solution of mean top tension of long flexible riser in modeling vortex-induced vibrations

Gu, Jijun; Wang, Yi; Zhang, Yu; Duan, Menglan; Levi, Carlos

doi:10.1016/j.apor.2013.01.004

Cited by 27 publications

(7 citation statements)

References 14 publications

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“…In order to make the simulation more efficient, tension is assumed to be a constant 2 2   y T z in various studies (Furnes and Sørensen, 2007;Gao et al, 2018;Gao et al, 2019;Ge et al, 2009;Ge et al, 2011). However, Gu et al (2013) found that the prolongation, and also tension, increases with the increasing velocity, which agrees with the experimental results. In addition, Lee and Allen (2010) found that the increase of the vibration frequency with flow speeds is strongly related to the rise of the axial tension.…”

Section: Nonlinear Coupled Structure and Wake Oscillator Modelsupporting

confidence: 70%

Predictions for combined In-Line and Cross-Flow VIV responses with a novel model for estimation of tension

Feng

Chen

et al. 2019

Ocean Engineering

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The dynamic responses of slender cylinders with high aspect ratios undergoing vortex-induced vibrations (VIV) are studied.In detail, a three-dimensional model predicting the VIV responses in both the In-Line and Cross-Flow directions of slender cylinders is proposed based on the nonlinear equation governing the dynamic deformation and a wake oscillator. The tension in the cylinder is estimated according to the incoming stream velocities. To predict the VIV responses, the cylinder is discretized into finite segments, and the vibrations of each segment are estimated from solving the governing equation when the excitation forces are modelled using the Van Der Pol's wake oscillator. Considering that the wake oscillator model estimates the excitation forces according to the dynamics of the cylinder, it reveals the interactions between the flow and the dynamics of the cylinder. In order to verify the model calculating the mean tension, the VIV responses, which has been experimentally tested, is numerically studied. The comparison between the numerically predicted and experimentally measured responses shows that, the approach, especially the novel tension model, proposed herein is reliable as the frequency

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Section: Nonlinear Coupled Structure and Wake Oscillator Modelsupporting

confidence: 70%

Predictions for combined In-Line and Cross-Flow VIV responses with a novel model for estimation of tension

Feng

Chen

et al. 2019

Ocean Engineering

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“…en, wake oscillator models have been continuously improved by some researchers [4][5][6][7][8][9][10][11][12][13]. Based on wake oscillator models, some studies have analyzed the coupled in-line and cross-flow VIV response of long slender flexible cylinders in uniform flows [14][15][16], and some scholars have also focused their attention on the study of coupled in-line and cross-flow VIV response of long slender flexible cylinders in sheared flows [17][18][19][20][21][22][23]. Leclercq and de Langre [24] also studied the VIV response of cylinders with large in-line bending deformation.…”

Section: Introductionmentioning

confidence: 99%

Study on Vortex-Induced Vibration of Deep-Water Marine Drilling Risers in Linearly Sheared Flows in consideration of Changing Added Mass

Gao

Cong

Cui

et al. 2020

Mathematical Problems in Engineering

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In order to more accurately predict the coupled in-line and cross-flow vortex-induced vibration (VIV) response of deep-water marine drilling risers in linearly sheared flows, an improved three-dimensional time-domain coupled model based on van der Pol wake oscillator models was established in this paper. The impact of the in-line and cross-flow changing added mass coefficients was taken into account in the model. The finite element, Newmark-β, and Newton–Raphson methods were adopted to solve the coupled nonlinear partial differential equations. The entire numerical solution process was realized by a self-developed program based on MATLAB. Comparisons between the numerical calculations and the published experimental tests showed that the improved model can more accurately predict some main features of the coupled in-line and cross-flow VIV of long slender flexible risers in linearly sheared flows to some extent. The coupled in-line and cross-flow VIV of a real-size marine drilling riser, usually used in the deep-water oil/gas industry in the South China Sea, was analyzed. The influence of top tension force and seawater flow speed, as well as platform heave amplitude and frequency, on the riser in-line and cross-flow VIV was also discussed. The results show that the platform heave motion increases the VIV displacements and changes the magnitudes of peak frequencies as well as the components of frequencies. The platform heave motion also has a significant influence on the vibration modes of the middle and upper sections of the riser. The impact level of each factor on the in-line and cross-flow VIV response of the riser is different. The improved model and the results of this paper can be used as a reference for the engineering design of deep-water marine drilling risers.

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“…Secondly, since the landing string is not constrained by the riser in the radial direction, it is prone to buckle under the disturbance of the transverse load as the axial tension in the pipe is small. erefore, the landing string is more prone to damage induced by large deformation and complex vibration [19] and has attracted the attentions of many scholars [20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Nonlinear Dynamic Characteristic Analysis of a Landing String in Deepwater Riserless Drilling

Zhao

Yang

et al. 2018

Shock and Vibration

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The landing string is an important component of deepwater riserless drilling systems. Determination of the dynamic characteristics of the landing string plays an essential role in its design for ensuring its safe operation. In this paper, a dynamic model is developed to investigate the dynamic response characteristics of a landing string, where a landing string in a marine environment is modeled as a flexible slender tube undergoing coupled transverse and axial motions. The heaving motion of the drilling platform is taken as the upper boundary condition and the motion of the drilling bit caused by the interaction between the rock and the bit as the lower boundary condition. A semiempirical Morison equation is used to simulate the effect of the load imposed by the marine environment. The dynamic model, which is nonlinearly coupled and multibody, is discretized by a finite element method and solved by the Newmark technique. Using the proposed model, the dynamic responses of the displacement, axial force, and moment in the landing string are investigated in detail to find out the influences of driving depth of surface catheter, platform motion, bit movement, and marine environment on the dynamical characteristics of the landing string.

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Analytical solution of mean top tension of long flexible riser in modeling vortex-induced vibrations

Cited by 27 publications

References 14 publications

Predictions for combined In-Line and Cross-Flow VIV responses with a novel model for estimation of tension

Predictions for combined In-Line and Cross-Flow VIV responses with a novel model for estimation of tension

Study on Vortex-Induced Vibration of Deep-Water Marine Drilling Risers in Linearly Sheared Flows in consideration of Changing Added Mass

Nonlinear Dynamic Characteristic Analysis of a Landing String in Deepwater Riserless Drilling

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