Experimental study of oscillating-grid turbulence interacting with a solid boundary
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 ce...
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| Format: | Article |
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Cambridge University Press
2017
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| Online Access: | https://eprints.nottingham.ac.uk/41098/ |
| _version_ | 1848796195839803392 |
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| author | McCorquodale, Mark W. Munro, Richard J. |
| author_facet | McCorquodale, Mark W. Munro, Richard J. |
| author_sort | McCorquodale, Mark W. |
| building | Nottingham Research Data Repository |
| collection | Online Access |
| description | 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). |
| first_indexed | 2025-11-14T19:44:08Z |
| format | Article |
| id | nottingham-41098 |
| institution | University of Nottingham Malaysia Campus |
| institution_category | Local University |
| last_indexed | 2025-11-14T19:44:08Z |
| publishDate | 2017 |
| publisher | Cambridge University Press |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | nottingham-410982020-05-04T18:29:25Z https://eprints.nottingham.ac.uk/41098/ Experimental study of oscillating-grid turbulence interacting with a solid boundary McCorquodale, Mark W. Munro, Richard J. 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). Cambridge University Press 2017-01-26 Article PeerReviewed McCorquodale, Mark W. and Munro, Richard J. (2017) Experimental study of oscillating-grid turbulence interacting with a solid boundary. Journal of Fluid Mechanics, 813 . pp. 768-798. ISSN 1469-7645 https://www.cambridge.org/core/journals/journal-of-fluid-mechanics/article/div-classtitleexperimental-study-of-oscillating-grid-turbulence-interacting-with-a-solid-boundarydiv/533425615468FFF345B45278E27DCB87 doi:10.1017/jfm.2016.843 doi:10.1017/jfm.2016.843 |
| spellingShingle | McCorquodale, Mark W. Munro, Richard J. Experimental study of oscillating-grid turbulence interacting with a solid boundary |
| title | Experimental study of oscillating-grid turbulence interacting with a solid boundary |
| title_full | Experimental study of oscillating-grid turbulence interacting with a solid boundary |
| title_fullStr | Experimental study of oscillating-grid turbulence interacting with a solid boundary |
| title_full_unstemmed | Experimental study of oscillating-grid turbulence interacting with a solid boundary |
| title_short | Experimental study of oscillating-grid turbulence interacting with a solid boundary |
| title_sort | experimental study of oscillating-grid turbulence interacting with a solid boundary |
| url | https://eprints.nottingham.ac.uk/41098/ https://eprints.nottingham.ac.uk/41098/ https://eprints.nottingham.ac.uk/41098/ |