Connection between corner vortices and shear layer instability in flow past an ellipse

Z. Jane Wang, J. G. Liu, S. Childress

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

We investigate, by numerical simulation, the shear layer instability associated with the outer layer of a spiral vortex formed behind an impulsively started thin ellipse. The unstable free shear layer undergoes a secondary instability. We connect this instability with the dynamics of corner vortices adjacent to the tip of the ellipse by observing that the typical turnover time of the corner vortex matches the period of the unstable mode in the shear layer. We suggest that the corner vortex acts as a signal generator, and produces periodic perturbation which triggers the instability.

Original languageEnglish
Pages (from-to)2446-2448
Number of pages3
JournalPhysics of Fluids
Volume11
Issue number9
DOIs
StatePublished - Sep 1999
Externally publishedYes

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