Y. X. Wang
Opposition control of turbulent spots
Wang, Y. X.; Choi, K. S.; Gaster, M.; Atkin, C.; Borodulin, V.; Kachanov, Y.
Authors
KWING-SO CHOI kwing-so.choi@nottingham.ac.uk
Professor of Fluid Mechanics
M. Gaster
C. Atkin
V. Borodulin
Y. Kachanov
Abstract
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.
Citation
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. https://doi.org/10.1017/jfm.2022.396
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 |
DOI | https://doi.org/10.1017/jfm.2022.396 |
Keywords | Mechanical Engineering; Mechanics of Materials; Condensed Matter Physics |
Public URL | https://nottingham-repository.worktribe.com/output/7954591 |
Publisher URL | https://www.cambridge.org/core/journals/journal-of-fluid-mechanics/article/opposition-control-of-turbulent-spots/F70C7513D8CC1C095B383957EBD788AD |
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 (https://creativecommons.org/licenses/by/4.0/), 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. |
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