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Study on Pure IL VIV of A Free Spanning Pipeline Under General Boundary Conditions |
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| Authors: | XU Wan-hai XU Jing-yu WU Ying-xiang and JI Chun-ning |
| Institution: | State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin 300072, China;Collaborative Innovation Centre for Advanced Ship and Deep-Sea Exploration, Shanghai 200240, China,Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China,Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China and State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin 300072, China |
| Abstract: | 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. |
| Keywords: | free spanning pipeline vortex-induced vibrations boundary conditions internal fluid |
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