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

McCorquodale, Mark W.; Munro, Richard J.

Authors

Mark W. McCorquodale

Richard J. Munro



Abstract

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 & 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).

Journal Article Type Article
Journal Journal of Fluid Mechanics
Print ISSN 0022-1120
Electronic ISSN 1469-7645
Publisher Cambridge University Press (CUP)
Peer Reviewed Peer Reviewed
Volume 813
APA6 Citation McCorquodale, M. W., & Munro, R. J. (in press). Experimental study of oscillating-grid turbulence interacting with a solid boundary. Journal of Fluid Mechanics, 813, doi:10.1017/jfm.2016.843
DOI https://doi.org/10.1017/jfm.2016.843
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
Copyright Statement Copyright information regarding this work can be found at the following address: http://eprints.nottingh.../end_user_agreement.pdf

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://eprints.nottingham.ac.uk/end_user_agreement.pdf





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