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

Title
Contributions of the wall boundary layer to the formation of the counter-rotating vortex pair in transverse jets
Authors
Schlegel F.Wee D.Marzouk Y.M.Ghoniem A.F.
Ewha Authors
위대현
SCOPUS Author ID
위대현scopus
Issue Date
2011
Journal Title
Journal of Fluid Mechanics
ISSN
0022-1120JCR Link
Citation
vol. 676, pp. 461 - 490
Indexed
SCI; SCIE; SCOPUS WOS scopus
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. © 2011 Cambridge University Press.
DOI
10.1017/jfm.2011.59
Appears in Collections:
엘텍공과대학 > 환경공학전공 > Journal papers
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