Two degree of freedom flow-induced vibration of cylindrical structures in marine environments: frequency ratio effects

Xiangxi Han, Wei Lin, Xiaojun Zhang, Youhong Tang, Chengbi Zhao

    Research output: Contribution to journalArticle

    11 Citations (Scopus)

    Abstract

    The flow-induced vibration of a cylindrical structure is a very common problem in marine environments such as undersea pipelines, offshore risers, and cables. In this study, the vortex-induced vibration (VIV) of an elastically mounted cylinder at a low Reynolds number is simulated by a transient coupled fluid–structure interaction numerical model. Considering VIV with low damping ratio, the response, hydrodynamic forces, and vortex shedding modes of the cylinder is systematically analyzed and summed up the universal rule under different frequency ratios. On the basis of the analysis, we find that the frequency ratio α is a very important parameter. It decides the locked-in, beat, and phase-switch phenomena of the cylinder, meanwhile, it also influence the vortex mode of the cylinder. The trajectory of the two degrees of freedom (2 DOF) case at different natural frequency ratios is discussed, with most trajectories having a “figure of 8” shape and a few having a “crescent” shape. A fast Fourier transformation technique is used to obtain the frequency characteristics of the vibration of the cylindrical structure. Using the 2 DOF cylinder model in place of the 1 DOF model presents several advantages in simulating the nonlinear characteristics of cylindrical structures, including the capacity to model the crosswise vibration generated by in-line vibration.

    Original languageEnglish
    Pages (from-to)479-492
    Number of pages14
    JournalJOURNAL OF MARINE SCIENCE AND TECHNOLOGY
    Volume21
    Issue number3
    DOIs
    Publication statusE-pub ahead of print - 2016

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