Vibration Response and Fatigue Prediction of Marine Steel Catenary Risers

doi:10.11885/j.issn.1674-5086.2020.10.25.02

Abstract

Abstract: Vortex-induced vibration (VIV) is a main factor contributing to the fatigue damage of marine risers. With the aid of Van Der Pol wake oscillator model, the present paper investigates the VIV of pinned-pinned steel catenary risers of different lengths subjected to different shear-flow profiles with the same flow rate. The second-order central difference method is employed to solve the coupled equations in both time and space domain, and the rain flow counting method is used to predict the fatigue life. The vibration presents a blended pattern of standing wave and traveling wave for the response propagation along the span. The vibration shifts from the standing-wave dominated response to the traveling-wave dominated one with the increase of the riser length. The riser experiences multi-frequency oscillation due to the influence of shear flow, and the traveling wave propagates from the riser top to its bottom. Furthermore, the propagation rate of traveling wave varies with the shear degree of flow profile and the riser length. The riser extracts less energy from ambient flow as the shear degree increases, while the energy consumption grows, resulting in the reduction of response amplitude. The fatigue damage is aggravated with the water depth at the same incoming flow profile. The same result is observed as the shear degree of flow profile increases at the same water depth.

Key words: vortex-induced vibration, steel catenary riser, Van Der Pol wake oscillator, rain flow counting method, fatigue damage

CLC Number:

TE973

ZHU Hongjun, DING Zhiqi, GAO Yue, ZHAO Honglei, HU Jie. Vibration Response and Fatigue Prediction of Marine Steel Catenary Risers[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2023, 45(1): 163-179.

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