Effects of roughness elements on bypass transition induced by a circular cylinder wake

Effects of roughness elements on bypass transition induced by a circular cylinder wake
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粗糙度元素对圆柱尾流引起的旁路转变的影响

DOI:
10.1007/s12650-010-0063-9
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发表时间:
2011-02
影响因子:
1.7
通讯作者:
Pan C
Pan C
中科院分区:
计算机科学4区
文献类型:
--
作者:
Wang J J;Zhang C;Pan C

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摘要实验研究了粗糙度元素影响下圆柱体尾迹引起的平板边界层的旁路转变。氢泡可视化结果表明,边界层分离发生在粗糙度上游,分离后的剪切层不同程度地被粗糙度切割,从而在粗糙度下游形成不同类型的二次涡。在二次涡的演化过程中,根据其后形成的发夹涡的不同空间尺度,观测到了两类不稳定,分别称为大尺度和小尺度不稳定。当二次涡发生小尺度不稳定时,还观察到了发夹涡的合并过程,并在此基础上提出了一种潜在的新的过渡控制策略。
AbstractThe bypass transition of flat-plate boundary layer induced by a circular cylinder wake under the influence of roughness elements is experimentally investigated. The hydrogen-bubble visualization results show that the boundary layer separation occurs upstream of the roughness, and the separated shear layer is incised by roughness to different extent, resulting in different kinds of secondary vortices formed immediately downstream of the roughness. During the evolution of the secondary vortex, two types of instabilities are observed, which are denoted as large- and small-scale instabilities, respectively, according to different spatial scale of the hairpin vortices formed afterward. A merging process of hairpin vortices is also observed when the secondary vortices undergo the small-scale instability, and a potential new transition control strategy based on the present observation is proposed.Graphical Abstract
DOI: 10.1063/1.1897377
发表时间: 2005-05
期刊: Physics of Fluids
影响因子: 4.6
作者:
J. Fransson;L. Brandt;A. Talamelli;C. Cossu
通讯作者: J. Fransson;L. Brandt;A. Talamelli;C. Cossu
DOI: 10.1063/1.1773493
发表时间: 2004-08
期刊: Physics of Fluids
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作者:
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DOI: 10.1017/s0022112008001018
发表时间: 2008-04
影响因子: 3.7
作者:
Feng, Li Hao;Pan, Chong;Wang, Jin Jun;Zhang, Pan Feng
通讯作者: Zhang, Pan Feng
DOI: 10.1007/978-1-4899-5579-1_1
发表时间: 1969
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DOI: 10.1063/1.1521124
发表时间: 2002-11
期刊: Physics of Fluids
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