IUTAM_2019_AAM.pdf (1.18 MB)
On the propagation of two types of disturbances through a laminar boundary layer subjected to separation and transition
chapter
posted on 2023-06-10, 00:48 authored by Thomas IrpsThomas Irps, Vasudevan KanjirakkadVasudevan KanjirakkadThe propagation of two types of artificial disturbances within a boundary layer is discussed. The boundary layer is initially laminar but later transitions to become turbulent through the formation of a separation bubble under the influence of an imposed adverse pressure gradient. The growth of the boundary layer and that of the disturbances within it are tracked experimentally using hotwire anemometry measurements. The effects of the interaction of the disturbances with the separation bubble are captured using both hotwire and particle image velocimetry measurements. For a chord based Reynolds number of 210 k it is shown that Kelvin–Helmholtz shedding frequencies over the bubble are unchanged in the presence of either of the disturbances and are comparable to the steady flow case with no disturbances present. Both disturbances produced an extensive calmed region on interacting with the bubble. The calmed region due to the bar wake is relatively longer and persistent. The upstream location of the separation bubble formation is unaffected by the disturbances, however the average size of the bubble is shown to be sensitive to the type of disturbance with the bar wake producing a thinner and shorter bubble.
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Publication status
- Published
File Version
- Accepted version
Publisher
SpringerExternal DOI
Volume
38Page range
407-418Pages
836.0Book title
IUTAM laminar-turbulent transition: 9th IUTAM symposium, London, UK, September 2–6, 2019Place of publication
ChamISBN
9783030679019Series
IUTAM BookseriesEdition
1Research groups affiliated with
- Thermo-Fluid Mechanics Research Centre Publications
Full text available
- Yes
Peer reviewed?
- Yes
Editors
Xuesong Wu, Spencer Sherwin, Peter SchmidLegacy Posted Date
2021-08-31First Open Access (FOA) Date
2022-08-01First Compliant Deposit (FCD) Date
2021-08-31Usage metrics
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