Study on Pure IL VIV of A Free Spanning Pipeline Under General Boundary Conditions

• Published in: China ocean engineering Vol. 31; no. 1; pp. 114 - 122
• Main Authors: Xu, Wan-hai, Xu, Jing-yu, Wu, Ying-xiang, Ji, Chun-ning
• Format: Journal Article
• Language: English
• Published: Nanjing Chinese Ocean Engineering Society 01.03.2017; Springer Nature B.V; Collaborative Innovation Centre for Advanced Ship and Deep-Sea Exploration, Shanghai 200240, China%Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China%State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin 300072, China; State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin 300072, China
• Subjects: Axial forces; Bed load; Boundary conditions; Case studies; Coastal Sciences; Differential equations; Engineering; Fluid- and Aerodynamics; Galerkin method; Galerkin方法; Marine & Freshwater Sciences; Numerical and Computational Physics; Ocean floor; Oceanography; Offshore Engineering; Ordinary differential equations; Partial differential equations; Pipeline design; Pipelines; Simulation; Submarine pipelines; Technical Notes; Vortex-induced vibrations; 常微分方程组; 悬跨; 河床沉积物; 涡激振动; 管道结构; 管道设计; 边界条件; vortex-induced vibrations; boundary conditions; free spanning pipeline; internal fluid
• ISSN: 0890-5487; 2191-8945
• DOI: 10.1007/s13344-017-0014-5

Pipeline spans may occur due to natural seabed irregularities or local scour of bed sediment. The pure in-line（IL）vortex-induced vibrations（VIV） analysis of the free spans is an important subject for design of pipeline in uneven seabed. The main objective of this paper is to analyze the characteristics of pure IL VIV of a free spanning pipeline under general boundary conditions. An IL wake oscillator model which can describe the coupling of pipeline structure and fluctuating drag is introduced and employed. The coupled partial differential equations of structure and wake are transformed into a set of ordinary differential equations using two-mode Galerkin method. Some case studies are presented and thoroughly discussed in order to investigate the effects of internal fluid, axial force and boundary conditions on the pure IL VIV.