On fatigue damage accumulation from in-line and cross-flow vortex-induced vibrations on risers

Baarholm, Gro Sagli; Larsen, Carl M.; Lie, Halvor

doi:10.1016/j.jfluidstructs.2005.07.013

Cited by 106 publications

(47 citation statements)

References 8 publications

(9 reference statements)

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“…It indicates that the contribution to the riser fatigue damage from the IL vibration will be in the same order of magnitude as it from the CF vibration. The same conclusion is also reported in Baarholm et al [6] and Trim et al [10] , where they found that the extent of IL vibration induced fatigue damage is similar to that caused by CF vibration. This conclusion is very important for engineering design because VIV analysis computer programs almost ignore the contribution of IL component to fatigue damage.…”

Section: Case Studysupporting

confidence: 85%

“…The tensioned string and untensioned beam both have the pinned ends, which are the same with the riser. Therefore, the formulations of their eigenfrequencies are written as [6] The eigenfrequency of the riser model is seen to follow the tensioned string case for the lower modes, and then becomes closer to the untensioned beam case as the mode number increases. This means that the stiffness of the riser will be tension-dominated for the lower modes.…”

Section: Case Studymentioning

confidence: 99%

“…The response is assumed to take place at a limited number of discrete frequencies and the programs are only able to calculate CF vibrations [5] . Baarholm et al [6] indicated, however, that fatigue damage from IL vibrations may become significant for long cylinder structure. Therefore, the purpose of this research is to develop a model, following refs.…”

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confidence: 99%

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Flow-induced vibrations of long circular cylinders modeled by coupled nonlinear oscillators

Wang

et al. 2009

Sci. China Ser. G-Phys. Mech. Astron.

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The dynamics of long slender cylinders undergoing vortex-induced vibrations (VIV) is studied in this work. Long slender cylinders such as risers or tension legs are widely used in the field of ocean engineering. When the sea current flows past a cylinder, it will be excited due to vortex shedding. A three-dimensional time domain model is formulated to describe the response of the cylinder, in which the in-line (IL) and cross-flow (CF) deflections are coupled. The wake dynamics, including in-line and cross-flow vibrations, is represented using a pair of non-linear oscillators distributed along the cylinder. The wake oscillators are coupled to the dynamics of the long cylinder with the acceleration coupling term. A non-linear fluid force model is accounted for to reflect the relative motion of cylinder to current. The model is validated against the published data from a tank experiment with the free span riser. The comparisons show that some aspects due to VIV of long flexible cylinders can be reproduced by the proposed model, such as vibrating frequency, dominant mode number, occurrence and transition of the standing or traveling waves. In the case study, the simulations show that the IL curvature is not smaller than CF curvature, which indicates that both IL and CF vibrations are important for the structural fatigue damage.

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Section: Case Studysupporting

confidence: 85%

Section: Case Studymentioning

confidence: 99%

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Flow-induced vibrations of long circular cylinders modeled by coupled nonlinear oscillators

Wang

et al. 2009

Sci. China Ser. G-Phys. Mech. Astron.

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“…Model tests [10][11][12][13][14][15][16][17] allow a better understanding of multi-mode behaviors of long slender cylinders. The requirements of these tests consist of large aspect ratio of the cylinder, high sampling rates and careful time synchronization for measurement systems.…”

Section: Introductionmentioning

confidence: 99%

An experimental investigation of dual-resonant and non-resonant responses for vortex-induced vibration of a long slender cylinder

Wei

Hong

2014

Sci. China Phys. Mech. Astron.

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Experimental results of the dual-resonant and non-resonant responses are presented for vortex-induced vibrations (VIV) of a long slender cylinder. The cylinder has a diameter of 10mm and a length of 3.31 m, giving an aspect ratio of 331. The cylinder was towed by a carriage with the velocity up to 1.5 m/s, with the Reynolds number varying from 2500 to 38000. Three different weights were used to provide the initial tension. Dual resonance means that resonance occurs simultaneously in both the cross-flow (CF) and in-line (IL) directions. The experiments were conducted in two stages. At the first stage, dual-resonant dynamic features of the cylinder subjected to vortex-induced excitation were investigated. The features of CF and IL vibration amplitude, motion orbits, phase angle differences, dominant frequencies and mode order numbers are presented. At the second stage of the experiments, particular emphasis was placed on non-resonant dynamic features. The variation of multi-mode modal displacement amplitudes was investigated in detail.

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“…

(Kim, et al, 2016;Baarholm, et al, 2006;Trim, et al, 2005)Oil and gas production riser systems need to be designed considering a wide band quarter-modal analysis which contains low-, wave-, VIV(Vortex induced vibration) frequencies. The VIV can be separated into cross-flow(CF) and in-line(IL) components.

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confidence: 99%

A Study on the Riser Fatigue Analysis Using a Quarter-modal Spectrum

Kim¹,

Lee²,

Choi³

2016

Journal of the Society of Naval Architects of Korea

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(Kim, et al., 2016;Baarholm, et al., 2006;Trim, et al., 2005)Oil and gas production riser systems need to be designed considering a wide band quarter-modal analysis which contains low-, wave-, VIV(Vortex induced vibration) frequencies. The VIV can be separated into cross-flow(CF) and in-line(IL) components. In this study, the various idealized tri-and quarter-modal spectra are suggested to analyze fatigue damage on the production riser system. In order to evaluate the fatigue damage increment caused by the IL's motion, tri-and quarter-modal spectral fatigue damages are calculated in time domain. And the fatigue damage calculated from two different modal spectra are compared quantitatively. Then the suitability of existent wide band fatigue damage models for quarter modal spectrum was evaluated by comparison of frequency domain calculation and time domain calculation. The result show that although spectral density of IL motion is not remarkable in quantity, the effect on the fatigue damage is significant and existent fatigue damage models are not adequately estimating damage by quarter-modal spectra.

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On fatigue damage accumulation from in-line and cross-flow vortex-induced vibrations on risers

Cited by 106 publications

References 8 publications

Flow-induced vibrations of long circular cylinders modeled by coupled nonlinear oscillators

Flow-induced vibrations of long circular cylinders modeled by coupled nonlinear oscillators

An experimental investigation of dual-resonant and non-resonant responses for vortex-induced vibration of a long slender cylinder

A Study on the Riser Fatigue Analysis Using a Quarter-modal Spectrum

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