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Contributions of the wall boundary layer to the formation of the counter-rotating vortex pair in transverse jets

Published online by Cambridge University Press:  08 April 2011

FABRICE SCHLEGEL ,
DAEHYUN WEE ,
YOUSSEF M. MARZOUK  and
AHMED F. GHONIEM
FABRICE SCHLEGEL*
Affiliation:
Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
DAEHYUN WEE
Affiliation:
Department of Environmental Science and Engineering, Ewha Womans University, Seoul 120-750, Republic of Korea
YOUSSEF M. MARZOUK
Affiliation:
Department of Aeronautics and Astronautics, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
AHMED F. GHONIEM
Affiliation:
Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
*
†Email address for correspondence: schlegel@mit.edu
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Abstract

Using high-resolution 3-D vortex simulations, this study seeks a mechanistic understanding of vorticity dynamics in transverse jets at a finite Reynolds number. A full no-slip boundary condition, rigorously formulated in terms of vorticity generation along the channel wall, captures unsteady interactions between the wall boundary layer and the jet – in particular, the separation of the wall boundary layer and its transport into the interior. For comparison, we also implement a reduced boundary condition that suppresses the separation of the wall boundary layer away from the jet nozzle. By contrasting results obtained with these two boundary conditions, we characterize near-field vortical structures formed as the wall boundary layer separates on the backside of the jet. Using various Eulerian and Lagrangian diagnostics, it is demonstrated that several near-wall vortical structures are formed as the wall boundary layer separates. The counter-rotating vortex pair, manifested by the presence of vortices aligned with the jet trajectory, is initiated closer to the jet exit. Moreover tornado-like wall-normal vortices originate from the separation of spanwise vorticity in the wall boundary layer at the side of the jet and from the entrainment of streamwise wall vortices in the recirculation zone on the lee side. These tornado-like vortices are absent in the case where separation is suppressed. Tornado-like vortices merge with counter-rotating vorticity originating in the jet shear layer, significantly increasing wall-normal circulation and causing deeper jet penetration into the crossflow stream.

JFM classification

Wakes/Jets: Jets Vortex Flows: Vortex Flows

Information

Type
Papers
Information
Journal of Fluid Mechanics , Volume 676 , 10 June 2011 , pp. 461 - 490
Copyright
Copyright © Cambridge University Press 2011

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References

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