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Numerical investigation of vortex-induced motions of a paired-column semi-submersible in currents

Lookup NU author(s): Professor Zhiqiang Hu



This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND).


Vortex-induced motions (VIM) is becoming a noteworthy issue for column-stabilized floating platforms, mainlydue to its substantial fatigue damage to risers and mooring system. The VIM of deep-draft semi-submersible ismore complex than single column floaters because of the wake interference between columns, as well as theconsiderable yaw motions. In the present work, a numerical approach for simulating VIM of deep-draft semisubmersibleis proposed. Specifically, detached-eddy simulation is used for turbulence modeling and dynamicoverset grid technique is used for moving objects. Simulations for stationary drag and VIM of a model-scalepaired-column semi-submersible are conducted with the proposed approach. The numerical results are comparedwith experimental data. Transverse, in-line and yaw motions are allowed during VIM simulations and arefurther analyzed in frequency domain by Fast Fourier Transform (FFT). Different VIM characteristics are observedat different current velocities. The work done by each component of the structure is also discussed. Flowvisualizations are presented for better understanding of the wake interferences during VIM. The accuracy andreliability of the current numerical approach is assessed.

Publication metadata

Author(s): Zhao W, Zou L, Wan D, Hu Z

Publication type: Article

Publication status: Published

Journal: Ocean Engineering

Year: 2018

Volume: 2018

Issue: 164

Pages: 272-283

Print publication date: 15/09/2018

Online publication date: 27/06/2018

Acceptance date: 09/06/2018

Date deposited: 28/06/2018

ISSN (print): 0029-8018

Publisher: Elsevier


DOI: 10.1016/j.oceaneng.2018.06.023


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