Flapping dynamics of an inverted flag in a uniform flow

被引：114
作者：
Ryu, Jaeha [1 ]
Park, Sung Goon [1 ]
Kim, Boyoung [1 ]
Sung, Hyung Jin [1 ]
机构：
[1] Korea Adv Inst Sci & Technol, Dept Mech Engn, Taejon 305701, South Korea
来源：
JOURNAL OF FLUIDS AND STRUCTURES | 2015年 / 57卷
基金：
新加坡国家研究基金会;
关键词：
Inverted flag; Immersed boundary method; Energy harvesting system; Vortical structures;
D O I：
10.1016/j.jfluidstructs.2015.06.006
中图分类号：
TH [机械、仪表工业];
学科分类号：
0802 ;
摘要：
The flapping motions of an inverted flag in a uniform flow were simulated using the immersed boundary method. The strain energy of the inverted flag was used as an indicator of the energy harvesting system efficiency. The flapping dynamics of and vortical structures around the inverted flag were examined in terms of the bending rigidity (gamma) and the Reynolds number (Re). Three flapping motion modes were observed: a deflected mode, a flapping mode, and a straight mode. A mode intermediate between the flapping mode and the straight mode was identified, the biased mode. The vortical structures in the wake were characterized by three modes: a vortex pair; a vortex pair with a single vortex, and two vortex pairs, during half of the flapping period. The maximum mean strain energy (E-S) was obtained when the vortical structures behind the inverted flag formed a vortex pair during the flapping mode. (C) 2015 Elsevier Ltd. All rights reserved.
引用
收藏
页码：159 / 169
页数：11
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