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


Journal Article

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. © 1999 American Institute of Physics.

Full Text

Duke Authors

Cited Authors

  • Wang, ZJ; Liu, JG; Childress, S

Published Date

  • January 1, 1999

Published In

Volume / Issue

  • 11 / 9

Start / End Page

  • 2446 - 2448

International Standard Serial Number (ISSN)

  • 1070-6631

Digital Object Identifier (DOI)

  • 10.1063/1.870108

Citation Source

  • Scopus