Generation of large-scale vortex dislocations in a three-dimensional wake-type flow

Numerical study of three-dimensional evolution of wake-type flow and vortex dislocations is performed by using a compact finite diffenence-Fourier spectral method to solve 3-D incompressible Navier-Stokes equations. A local spanwise nonuniformity in momentum defect is imposed on the incoming wake-ty...

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Bibliographic Details
Published inScience China. Mathematics Vol. 44; no. 12; pp. 1585 - 1595
Main Authors Ling, Guocan, Xiong, Zhongmin
Format Journal Article
LanguageEnglish
Published Heidelberg Springer Nature B.V 2001
State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100080, China
Subjects
Flow stability
Fluid dynamics
Fluid flow
Nonuniformity
Spectral methods
Three dimensional flow
Vortex streets
nonuniform wake-type flow
DNS
vortex dislocations
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Summary:Numerical study of three-dimensional evolution of wake-type flow and vortex dislocations is performed by using a compact finite diffenence-Fourier spectral method to solve 3-D incompressible Navier-Stokes equations. A local spanwise nonuniformity in momentum defect is imposed on the incoming wake-type flow. The present numerical results have shown that the flow instability leads to three-dimensional vortex streets, whose frequency, phase as well as the strength vary with the span caused by the local nonuniformity. The vortex dislocations are generated in the nonuniform region and the large-scale chain-like vortex linkage structures in the dislocations are shown. The generation and the characteristics of the vortex dislocations are described in detail.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
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content type line 23
ISSN:1006-9283
1674-7283
1862-2763
1869-1862
DOI:10.1007/BF02880798