Knowledge Management System of Institue of Mechanics, CAS
| Numerical exploration of new features on three-dimensional transition of a cylinder wake | |
Ling GC(凌国灿) ; Xiong J(熊俊); Zhu KQ(朱克勤); Ling, GC (reprint author), Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100080, Peoples R China.
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| Source Publication | Science in China Series A-Mathematics
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| 2004 | |
| Volume | 47Pages:69-80 |
| ISSN | 1006-9283 |
| Abstract | The three-dimensional transition of the wake flow behind a circular cylinder is studied in detail by direct numerical simulations using 3D incompressible N-S equations for Reynolds number ranging from 200 to 300. New features and vortex dynamics of the 3D transition of the wake are found and investigated. At Re = 200, the flow pattern is characterized by mode A instability. However, the spanwise characteristic length of the cylinder determines the transition features. Particularly for the specific spanwise characteristic length linear stable mode may dominate the wake in place of mode A and determine the spanwise phase difference of the primary vortices shedding. At Re = 250 and 300 it is found that the streamwise vortices evolve into a new type of mode - "dual vortex pair mode" downstream. The streamwise vortex structures switch among mode A, mode B and dual vortex pair mode from near wake to downstream wake. At Re = 250, an independent low frequency f(m) in addition to the vortex shedding frequency f(s) is identified. Frequency coupling between f(m) and f(s) occurs. These result in the irregularity of the temporal signals and become a key feature in the transition of the wake. Based on the formation analysis of the streamwise vorticity in the vicinity of cylinder, it is suggested that mode A is caused by the emergence of the spanwise velocity due to three dimensionality of the incoming flow past the cylinder. Energy distribution on various wave numbers and the frequency variation in the wake are also described. |
| Keyword | Cylinder Wake 3d Transition Fourier-spectral-spectral-element Method Direct Numerical Simulation (Dns) Circular-cylinder Vortex Dislocations Flow Simulation Dynamics |
| DOI | 10.1360/04za0006 |
| Indexed By | SCI |
| Language | 英语 |
| WOS ID | WOS:000222678800007 |
| WOS Keyword | CIRCULAR-CYLINDER ; VORTEX DISLOCATIONS ; FLOW ; SIMULATION ; DYNAMICS |
| WOS Research Area | Mathematics |
| WOS Subject | Mathematics, Applied ; Mathematics |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://dspace.imech.ac.cn/handle/311007/33789 |
| Collection | 力学所知识产出(1956-2008) |
| Corresponding Author | Ling, GC (reprint author), Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100080, Peoples R China. |
| Recommended Citation GB/T 7714 | Ling GC,Xiong J,Zhu KQ,et al. Numerical exploration of new features on three-dimensional transition of a cylinder wake[J]. Science in China Series A-Mathematics,2004,47:69-80. |
| APA | 凌国灿,熊俊,朱克勤,&Ling, GC .(2004).Numerical exploration of new features on three-dimensional transition of a cylinder wake.Science in China Series A-Mathematics,47,69-80. |
| MLA | 凌国灿,et al."Numerical exploration of new features on three-dimensional transition of a cylinder wake".Science in China Series A-Mathematics 47(2004):69-80. |
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