Intrinsic relationship of vorticity between modes A and B in the wake of a bluff body
查看参考文献12篇
文摘
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The intrinsic physical relationship of vorticity between modes A and B in the three-dimensional wake transition is investigated.Direct numerical simulations for the flow past a square-section cylinder are carried out at Reynolds numbers of 180 and 250,associated with modes A and B,respectively.Based on the analysis of spacial distributions of vorticity in the near wake,characteristics of the vertical vorticity in modes A and B are identified.Moreover,the relationship of three vorticity components with specific signs is summarized into two sign laws,as intrinsic physical relationships between two instability modes.By the theory of vortex-induced vortex,such two sign laws confirm that there are two and only two kinds of vortex-shedding patterns in the near wake,just corresponding to modes A and B.In brief,along the free stream direction,mode A can be described by the parallel shedding vertical vortices with the same sign,while mode B is described by the parallel shedding streamwise vortices with the same sign.Finally,it is found out that the-type vortex is a basic kind of vortex structure in both modes A and B. |
来源
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Theoretical and Applied Mechanics Letters
,2018,8(5):320-325 【核心库】
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DOI
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10.1016/j.taml.2018.05.006
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关键词
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Mode A
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Mode B
;
Wake
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Bluff body
;
Sign law
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地址
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1.
Institute of Mechanics,Chinese Academy of Sciences, Key Laboratory for Mechanics in Fluid Solid Coupling Systems,Chinese Academy of Sciences, Beijing, 100190
2.
School of Engineering Sciences,University of Chinese Academy of Sciences, Beijing, 100049
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语种
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英文 |
文献类型
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研究性论文 |
ISSN
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2095-0349 |
学科
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力学 |
基金
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supported by the Strategic Priority Research Program of the Chinese Academy of Science
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文献收藏号
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CSCD:6379773
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参考文献 共
12
共1页
|
1.
Barkley D. Three-dimensional Floquet stability analysis of the wake of a circular cylinder.
Journal of Fluid Mechanics,1996,322:215-241
|
被引
15
次
|
|
|
|
2.
Williamson C H K. Vortex dynamics in the cylinder wake.
Annual Review of Fluid Mechanics,1996,28:477-539
|
被引
104
次
|
|
|
|
3.
Luo S C. Characteristics of square cylinder wake transition flows.
Phys. Fluids,2003,15:2549-2559
|
被引
5
次
|
|
|
|
4.
Giannetti F. WKBJ analysis in the periodic wake of a cylinder.
Theor. Appl. Mech. Lett,2015,5:107-110
|
被引
1
次
|
|
|
|
5.
Jiang H. Three-dimensional direct numerical simulation of wake transitions of a circular cylinder.
Journal of Fluid Mechanics,2016,801:353-391
|
被引
5
次
|
|
|
|
6.
Jiang H. Stable state of Mode A for flow past a circular cylinder.
Physics of Fluids,2016,28:104103
|
被引
1
次
|
|
|
|
7.
Jiang H Y. Three-dimensional wake transition of a square cylinder.
Journal of Fluid Mechanics,2018,842:102-127
|
被引
5
次
|
|
|
|
8.
Zhang H Q. On the transition of the cylinder wake.
Physics of Fluids,1995,7:779-794
|
被引
7
次
|
|
|
|
9.
Blackburn H M. On three-dimensional quasiperiodic Floquet instabilities of two-dimensional bluff body wakes.
Physcis of Fluids,2003,15:L57-L60
|
被引
1
次
|
|
|
|
10.
Lin L M. Mechanism of wavy vortex and sign laws in flow past a bluff body: vortex-induced vortex.
Acta Mechnica Sinica,2018(in press)
|
被引
5
次
|
|
|
|
11.
Karniadakis G E. High-order splitting methods for the incompressible Navier-Stokes equatcons.
Journal of Computational Physics,1991,97:414-443
|
被引
63
次
|
|
|
|
12.
Lin L M.
Wake dynamics and forces in the flow around the square-section cylinder with a geometric disturbance, [Ph.D. Thesis],2007
|
被引
1
次
|
|
|
|
|