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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.
Author(s): Zhao W, Zou L, Wan D, Hu Z
Publication type: Article
Publication status: Published
Journal: Ocean Engineering
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
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