Dr MARK MCCORQUODALE MARK.MCCORQUODALE2@NOTTINGHAM.AC.UK
ASSISTANT PROFESSOR
Experimental study of oscillating-grid turbulence interacting with a solid boundary
McCorquodale, Mark W.; Munro, R. J.
Authors
Dr RICHARD MUNRO RICK.MUNRO@NOTTINGHAM.AC.UK
ASSOCIATE PROFESSOR
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 6, 2017 |
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 |
Contract Date | Mar 6, 2017 |
Files
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