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http://dx.doi.org/10.1515/ijnaoe-2015-0063

Experimental investigation of flow characteristics around four square-cylinder arrays at subcritical Reynolds numbers  

Liu, Mingyue (State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University)
Xiao, Longfei (State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University)
Yang, Lijun (State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University)
Publication Information
International Journal of Naval Architecture and Ocean Engineering / v.7, no.5, 2015 , pp. 906-919 More about this Journal
Abstract
The Deep Draft Semi-Submersible (DDS) concepts are known for their favourable vertical motion performance. However, the DDS may experience critical Vortex-Induced Motion (VIM) stemming from the fluctuating forces on the columns. In order to investigate the current-induced excitation forces of VIM, an experimental study of flow characteristics around four square-section cylinders in a square configuration is presented. A number of column spacing ratios and array attack angles were considered to investigate the parametric influences. The results comprise flow patterns, drag and lift forces, as well as Strouhal numbers. It is shown that both the drag and lift forces acting on the cylinders are slightly different between the various L/D values, and the fluctuating forces peak at L/D = 4.14. The lift force of downstream cylinders reaches its maximum at around ${\alpha}=15^{\circ}$. Furthermore, the flow around circular-section-cylinder arrays is also discussed in comparison with that of square cylinders.
Keywords
Deep draft semi-submersible (DDS); Experimental study; Four square-section cylinders; Spacing ratio; Array attack angle;
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