EXPERIMENTAL STUDY ON FLOW AROUND CIRCULAR CYLINDERS WITH LOW ASPECT RATIO

被引：0
|
作者：
Goncalves, Rodolfo T. [1 ]
Rosetti, Guilherme F. [1 ]
Franzini, Guilherme R. [1 ]
Fujarra, Andre L. C. [1 ]
机构：
[1] Univ Sao Paulo, Dept Naval Architecture & Ocean Engn, Escola Politecn, TPN Numer Offshore Tank, Sao Paulo, SP, Brazil
来源：
PROCEEDINGS OF THE ASME 32ND INTERNATIONAL CONFERENCE ON OCEAN, OFFSHORE AND ARCTIC ENGINEERING - 2013 - VOL 7 | 2013年
关键词：
stationary circular cylinder; free-surface piercing cylinder; low aspect ratio; PIV; force measurements; Strouhal number; VORTEX-INDUCED MOTIONS; SURFACE; WAKE;
D O I：
暂无
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
Experiments were carried out in a recirculating water channel regarding the flow around stationary circular cylinders with low aspect ratio piercing the water free surface. Eight different aspect ratios were tested, namely L/D = 0.1, 0.2, 0.3, 0.5, 0.75, 1.0, 1.5 and 2.0; this range corresponds to aspect ratio related to circular offshore systems, such as spar and monocolumn platforms. Force was measured using a six degree-of-freedom load cell and Strouhal number is inferred through the transverse force fluctuation frequency. The range of Reynolds number covers 10,000 < Re < 50,000. PIV measurements were performed in some aspect ratio cases, namely 0.3, 0.5, 1.0 and 2.0 for Reynolds number equal to 43,000. The results showed a decrease in drag force coefficients with decreasing aspect ratio, as well as a decrease in Strouhal number with decreasing aspect ratio. The PIV showed the existence of an arch-type vortex originated in the cylinder free end.
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页数：14
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