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

被引：32

作者：

Liu, Mingyue ^{[1
]}

Xiao, Longfei ^{[1
]}

Yang, Lijun ^{[1
]}

机构：

[1] Shanghai Jiao Tong Univ, State Key Lab Ocean Engn, Shanghai 200030, Peoples R China

来源：

INTERNATIONAL JOURNAL OF NAVAL ARCHITECTURE AND OCEAN ENGINEERING | 2015年 / 7卷 / 05期

基金：

中国国家自然科学基金;

关键词：

Deep draft semi-submersible (DDS); Experimental study; Four square-section cylinders; Spacing ratio; Array attack angle; VORTEX-INDUCED MOTIONS; CIRCULAR-CYLINDER; CROSS-FLOW; SEMISUBMERSIBLE PLATFORM; RECTANGULAR CYLINDERS; STROUHAL NUMBERS; FORCES; WAKE; TURBULENCE; PRESSURE;

D O I：

10.1515/ijnaoe-2015-0063

中图分类号：

U6 [水路运输]; P75 [海洋工程];

学科分类号：

0814 ; 081505 ; 0824 ; 082401 ;

摘要：

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 degrees. Furthermore, the flow around circular-section-cylinder arrays is also discussed in comparison with that of square cylinders.

引用

页码：906 / 919

页数：14

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