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http://bura.brunel.ac.uk/handle/2438/28653| Title: | On the Enhancement and Suppression of Turbulent Wall Pressure by Large Eddy Break Up Devices |
| Authors: | Chong, TP Muhammad, C |
| Issue Date: | 26-Apr-2024 |
| Publisher: | American Institute of Physics |
| Citation: | Chong, T.P. and Muhammad, C. (2024) 'On the Enhancement and Suppression of Turbulent Wall Pressure by Large Eddy Break Up Devices', Physics of Fluids, 36 (4), 045157, pp . 1 - 15. doi: 10.1063/5.0195041. |
| Abstract: | An experimental study is presented on the application of Large Eddy BreakUp (LEBU) on a flat plate as a sourcetargeting device to perturb the wall pressure fluctuations of a turbulent boundary layer. When interacting with a LEBU wake, the wall pressure spectra can establish a self-similar behaviour against s′, which is a normalised separation distance between the LEBU’s trailing edge and the targeted location for aeroacoustics noise source mitigation. It is found that s′ >3is neededto achieve an overall reduction in the wall pressure fluctuations. The fundamental mechanism by which the LEBUcanreducethewall pressure fluctuation is investigated by studying the spatio-temporal evolution of turbulent spots. When the emanated LEBU wake is interacted with the outer part of turbulent spot, the shielding effect can always inhibit the turbulent fluids ejection from the spot’s leading edge. However, incursion of the high momentum f luids wall-sweeping event at the spot’s trailing edge can only be effectively prevented when s′ > 3. |
| Description: | Acknowledgement: A CC BY or equivalent licence is applied to the Author Accepted Manuscript arising from this submission, in accordance with the grant’s open access conditions. The authors would also like to thank the PhD studentship sponsored by the Thomas Gerald Gray Charitable Trust in the United Kingdom. Data Availability: The data that support the findings of this study are available from the corresponding author upon reasonable request. |
| URI: | https://bura.brunel.ac.uk/handle/2438/28653 |
| DOI: | https://doi.org/10.1063/5.0195041 |
| ISSN: | 1070-6631 |
| Other Identifiers: | ORCiD: Tze Pei Chong https://orcid.org/0000-0002-5272-3943 ORCiD: C. Muhammad https://orcid.org/0009-0008-5243-5379 045157 |
| Appears in Collections: | Dept of Mechanical and Aerospace Engineering Research Papers |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| FullTextAAM.pdf | Copyright © 2024 The Author(s). A CC BY (or equivalent licence) is applied to the Author Accepted Manuscript arising from this submission, in accordance with the grant’s open access conditions (https://creativecommons.org/licenses/by/4.0/). | 6.89 MB | Adobe PDF | View/Open |
| FullText.pdf | Embargoed until 26 April 2025 | 4.45 MB | Adobe PDF | View/Open |
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