An insight into the interaction between the in-plane and out-of-plane responses of a catenary flexible riser

Yue Gao, Hongjun Zhu, Quanhua Li, Jie Hu, Tongming Zhou, Yongbo Shao

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

Nonlinear dynamic response of catenary flexible risers excited by ocean currents is the main reason for fatigue failures. In this work, a series of experiments are conducted to improve the understanding of the intrinsic relationship between the in-plane and out-of-plane responses of a catenary flexible riser subjected to a sheared current in the depth-averaged Reynold number range of 150-1880. It is found that the interaction between the in-plane and out-of-plane responses is sensitive to the reduced velocity. Four patterns are identified, including the weak coupling, the partial coupling, the strong coupling, and the strong coupling+. The interaction is negligible at low reduced velocities. In contrast, when the reduced velocity is sufficiently large, the in-plane dominant frequency coincides with the out-of-plane one, signifying a strong coupling. As the reduced velocity increases, only a part of the riser possesses the same dominant frequency in the in-plane and out-of-plane directions, termed partial coupling. At higher reduced velocities, the coupled pipe section is shortened and the interaction is finally attenuated.

Original languageEnglish
Article number107115
JournalPhysics of Fluids
Volume34
Issue number10
DOIs
Publication statusPublished - 1 Oct 2022

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