NDLI: Investigation of Effect of Twisted Surface on Suppression of Vortex-Induced Motion of a Square Column

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Investigation of Effect of Twisted Surface on Suppression of Vortex-Induced Motion of a Square Column

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Wu, Chih-Hua Lim, Teck-Bin Arthur Kang, Chang-Wei Ma, Shengwei
Copyright Year	2018
Abstract	Suppression of vortex-induced motion (VIM) of multi-columns semisubmersibles is an important factor for the safety design and operating environment of floating platforms. Vortex generation around square columns is a key issue to cause VIM, and thus, an essential point for suppressing VIM is to desynchronize vortex shedding frequency and natural frequency of the system. In our work, we investigate the effect of a square column with the twisted surface on the suppression of VIM. The numerical tool we used in this work is an open source package, OpenFOAM, to solve transient flow pattern around a vibrating square column. The numerical validation of the present study is done by benchmarking with the reported experimental work at moderate Reynolds numbers (Re). In real sea state, the flow around floating structure is turbulent and is in high Re region. We implemented k-ω SST DES turbulence model in the present numerical model to solve complex turbulent flow around the square column with the twisted surface at high Re. By comparison with VIM of a square column, the VIM reduction of a twisted column is significant, which is up to 86% of VIM reduction. The vortex structure, flow separation points and vortex shedding frequency are varied in the spanwise direction of the twisted column, which causes the effect of vortex desynchronization on the VIM. The detailed flow pattern, 3D vortex structure (Q criterion) around the twisted column is demonstrated as well. A remarkable conclusion is made based on the present numerical findings.
Sponsorship	Ocean, Offshore and Arctic Engineering Division
File Format	PDF
ISBN	9780791851210
DOI	10.1115/OMAE2018-77107
Volume Number	Volume 2: CFD and FSI
Conference Proceedings	ASME 2018 37th International Conference on Ocean, Offshore and Arctic Engineering
Language	English
Publisher Date	2018-06-17
Publisher Place	Madrid, Spain
Access Restriction	Subscribed
Subject Keyword	Turbulence Vortex shedding Seas Computer simulation Flow separation Reynolds number Unsteady flow Flow (dynamics) Floating structures Design Vortices Semi-submersible offshore structures Safety
Content Type	Text
Resource Type	Article

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