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Coherent structures in bypass transition induced by a cylinder wake

Published online by Cambridge University Press:  30 April 2008

CHONG PAN ,
JIN JUN WANG ,
PAN FENG ZHANG  and
LI HAO FENG
CHONG PAN
Affiliation:
Institute of Fluid Mechanics, Beijing University of Aeronautics and Astronautics, Beijing, 100083, China
JIN JUN WANG
Affiliation:
Institute of Fluid Mechanics, Beijing University of Aeronautics and Astronautics, Beijing, 100083, China
PAN FENG ZHANG
Affiliation:
Institute of Fluid Mechanics, Beijing University of Aeronautics and Astronautics, Beijing, 100083, China
LI HAO FENG
Affiliation:
Institute of Fluid Mechanics, Beijing University of Aeronautics and Astronautics, Beijing, 100083, China
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Abstract

Flat-plate boundary layer transition induced by the wake vortex of a two-dimensional circular cylinder is experimentally investigated. Combined visualization and velocity measurements show a different transition route from the Klebanoff mode in free-stream turbulence-induced transition. This transition scenario is mainly characterized as: (i) generation of secondary transverse vortical structures near the flat plate surface in response to the von Kármán vortex street of the cylinder; (ii) formation of hairpin vortices due to the secondary instability of secondary vortical structures; (iii) growth of hairpins which is accelerated by wake-vortex induction; (iv) formation of hairpin packets and the associated streaky structures. Detailed investigation shows that during transition the evolution dynamics and self-sustaining mechanisms of hairpins, hairpin packets and streaks are consistent with those in a turbulent boundary layer. The wake vortex mainly plays the role of generating and destabilizing secondary transverse vortices. After that, the internal mechanisms become dominant and lead to the setting up of a self-sustained turbulent boundary layer.

Type
Papers
Information
Journal of Fluid Mechanics , Volume 603 , 25 May 2008 , pp. 367 - 389
Copyright
Copyright © Cambridge University Press 2008

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