期刊
OCEAN ENGINEERING
卷 248, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.oceaneng.2022.110758
关键词
Vortex-induced vibration; Elliptic cylinder; Fluid-structure interaction (FSI); Aspect ratio; Sub-vortex
资金
- LiaoNing Revitalization Talents Program [XLYC1807190, XLYC1908027]
- National Natural Science Foundation of China [52071059, 52061135107]
This study investigates the hydrodynamic characteristics of an elastically-mounted elliptic cylinder at low mass and damping ratios. The results show that the streamlined profile of the cylinder delays vortex shedding and reduces vorticity. However, the hydrodynamic characteristics become more complicated for larger aspect ratios.
This study investigates the hydrodynamic characteristics of an elastically-mounted elliptic cylinder at low mass ratio m* = 2 and low damping ratio zeta = 0.007. The aspect ratio (AR) defined by the characteristic length in the streamwise and transverse direction varies in the range 0.5 <= AR <= 2.0. The dynamic response is characterized as a function of reduced velocity. The streamlined profile of the elliptic cylinder results in a delay of the vortex shedding and a diminished strength of the averaged vorticity. However, the hydrodynamic characteristics become more complicated for large ARs. Both the response amplitude and the hydrodynamic forces acting on the cylinder are enhanced as the afterbody is reduced. The PSD behaviors show the existence of four different flow regimes. Several new pertinent modes,& nbsp;such as 2 P-o(& lowast;& nbsp;), 2T*, etc., are captured through flow visualizations. A comprehensive analysis of the vortex shedding indicates the sub-vortices generated at the rear of the cylinder plays a key role in the formation and evolution wake modes. Besides, the time-averaged vorticity magnitude at the vortex core elucidate that despite secondary vortices account for a large proportion of the primary vortices, they only make a small contribution to the suppression of the vibration amplitude.
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