Skip to main content

Research Repository

Advanced Search

Opposition control of turbulent spots

Wang, Y. X.; Choi, K. S.; Gaster, M.; Atkin, C.; Borodulin, V.; Kachanov, Y.

Opposition control of turbulent spots Thumbnail


Y. X. Wang

Professor of Fluid Mechanics

M. Gaster

C. Atkin

V. Borodulin

Y. Kachanov


Opposition control of artificially initiated turbulent spots in a laminar boundary layer was carried out in a low-turbulence wind tunnel with the aim to delay transition to turbulence by modifying the turbulent structure within the turbulent spots. The timing and duration of control, which was carried out using wall-normal jets from a spanwise slot, were pre-determined based on the baseline measurements of the transitional boundary layer. The results indicated that the high-speed region of the turbulent spots was cancelled by opposition control, which was replaced by a carpet of low-speed fluid. The application of the variable-interval time-averaging technique on the velocity fluctuation signals demonstrated a reduction in both the burst duration and intensity within the turbulent spots, but the burst frequency was increased.


Wang, Y. X., Choi, K. S., Gaster, M., Atkin, C., Borodulin, V., & Kachanov, Y. (2022). Opposition control of turbulent spots. Journal of Fluid Mechanics, 943, Article A3.

Journal Article Type Article
Acceptance Date Apr 28, 2022
Online Publication Date Jun 6, 2022
Publication Date Jul 25, 2022
Deposit Date May 5, 2022
Publicly Available Date Dec 7, 2022
Journal Journal of Fluid Mechanics
Print ISSN 0022-1120
Electronic ISSN 1469-7645
Publisher Cambridge University Press
Peer Reviewed Peer Reviewed
Volume 943
Article Number A3
Keywords Mechanical Engineering; Mechanics of Materials; Condensed Matter Physics
Public URL
Publisher URL
Additional Information Copyright: © The Author(s), 2022. Published by Cambridge University Press; License: This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (, which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited.; Free to read: This content has been made available to all.


You might also like

Downloadable Citations