IMECH-IR  > 力学所知识产出(1956-2008)
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)
Source Publication3rd M.I.T. Conference on Computational Fluid and Solid Mechanics
2005
Conference Name3rd M.I.T. Conference on Computational Fluid and Solid Mechanics
Conference DateJune 14, 2005 - June 17, 2005
Conference PlaceBoston, MA, United states
AbstractTwo 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.
KeywordFlow Quantities Frequency Differences Local Irregularities Non-uniformities Phase Difference Proper Orthogonal Decomposition Method Transition Behavior Vortex Dislocation Vortex Dislocations Wake Flows Wake-type Flow
ISBN080444814
Indexed ByEI
Language英语
Document Type会议论文
Identifierhttp://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],2005.
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