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| Numerical analysis of two distinct types of vortex dislocation in wake-type flows with different spanwise nonuniformities | |
Ling GC(凌国灿) ; Niu JY(牛家玉)
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| Source Publication | 3rd M.I.T. Conference on Computational Fluid and Solid Mechanics |
| 2005 | |
| Conference Name | 3rd M.I.T. Conference on Computational Fluid and Solid Mechanics |
| Conference Date | June 14, 2005 - June 17, 2005 |
| Conference Place | Boston, MA, United states |
| Abstract | Two distinct types of vortex dislocation generated in wake-type flows with different spanwise nonuniformities are numerically studied by direct numerical simulation (DNS). A local spanwise disturbance to the velocity of the oncoming flow leads to a generation of consecutive twisted vortex dislocations in the middle downstream, which is mainly caused by phase differences among vortex-shedding cells. A stepped variation of velocity in the oncoming flow yields a periodic vortex splitting-reconnection type of dislocation, which is mainly caused by frequency differences among the shedding cells. Dynamics and main features of these dislocations, especially the vortex linkages over the dislocations, are clearly described by tracing the substantial modification of vorticity lines and other key flow quantities. Local irregularities in the variations of velocity, vorticity and frequency, and transition behavior of the wake flows are analyzed by wavelet analysis and the proper orthogonal decomposition (POD) method. © 2005 Elsevier Ltd. |
| Keyword | Flow Quantities Frequency Differences Local Irregularities Non-uniformities Phase Difference Proper Orthogonal Decomposition Method Transition Behavior Vortex Dislocation Vortex Dislocations Wake Flows Wake-type Flow |
| ISBN | 080444814 |
| Indexed By | EI |
| Language | 英语 |
| Document Type | 会议论文 |
| Identifier | http://dspace.imech.ac.cn/handle/311007/60284 |
| Collection | 力学所知识产出(1956-2008) |
| Recommended Citation GB/T 7714 | Ling GC,Niu JY. Numerical analysis of two distinct types of vortex dislocation in wake-type flows with different spanwise nonuniformities[C]3rd M.I.T. Conference on Computational Fluid and Solid Mechanics,2005. |
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