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Experimental study of oscillating-grid turbulence interacting with a solid boundary

McCorquodale, Mark W.; Munro, R. J.

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Abstract

© 2017 Cambridge University Press. The interaction between oscillating-grid turbulence and a solid, impermeable boundary (positioned below, and aligned parallel to, the grid) is studied experimentally. Instantaneous velocity measurements, obtained using two-dimensional particle imaging velocimetry in the vertical plane through the centre of the (horizontal) grid, are used to study the effect of the boundary on the root-mean-square velocity components, the vertical flux of turbulent kinetic energy (TKE) and the terms in the Reynolds stress transport equation. Identified as a critical aspect of the interaction is the blocking of a vertical flux of TKE across the boundary-affected region. Terms of the Reynolds stress transport equations show that the blocking of this energy flux acts to increase the boundary-tangential turbulent velocity component, relative to the far-field trend, but not the boundary-normal velocity component. The results are compared with previous studies of the interaction between zero-mean-shear turbulence and a solid boundary. In particular, the data reported here are in support of viscous and 'return-to-isotropy' mechanisms governing the intercomponent energy transfer previously proposed, respectively, by Perot and Moin (J. Fluid Mech., vol. 295, 1995, pp. 199-227) and Walker et al. (J. Fluid Mech., vol. 320, 1996, pp. 19-51), although we note that these mechanisms are not independent of the blocking of energy flux and draw parallels to the related model proposed by Magnaudet (J. Fluid Mech., vol. 484, 2003, pp. 167-196).

Citation

McCorquodale, M. W., & Munro, R. J. (2017). Experimental study of oscillating-grid turbulence interacting with a solid boundary. Journal of Fluid Mechanics, 813, 768-798. https://doi.org/10.1017/jfm.2016.843

Journal Article Type Article
Acceptance Date Dec 7, 2016
Online Publication Date Jan 26, 2017
Publication Date Feb 25, 2017
Deposit Date Mar 6, 2017
Publicly Available Date Mar 28, 2024
Journal Journal of Fluid Mechanics
Print ISSN 0022-1120
Electronic ISSN 1469-7645
Publisher Cambridge University Press
Peer Reviewed Peer Reviewed
Volume 813
Pages 768-798
DOI https://doi.org/10.1017/jfm.2016.843
Public URL https://nottingham-repository.worktribe.com/output/838924
Publisher URL https://www.cambridge.org/core/journals/journal-of-fluid-mechanics/article/div-classtitleexperimental-study-of-oscillating-grid-turbulence-interacting-with-a-solid-boundarydiv/533425615468FFF345B45278E27DCB87

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