Marshall, CR, Dorrell, RM, Keevil, GM orcid.org/0000-0002-1607-8297 et al. (2 more authors) (2023) On the role of transverse motion in pseudo-steady gravity currents. Experiments in Fluids, 64 (3). 63. ISSN 0723-4864
Abstract
Flow in the body of gravity currents is typically assumed to be statistically two-dimensional, and cross-stream flow is often neglected (Simpson 1997; Meiburg et al. 2015). Here, we assess the validity of such assumptions using Shake-the-Box particle tracking velocimetry measurements of experimental gravity current flows. The resulting instantaneous, volumetric, whole-field velocity measurements indicate that cross-stream and vertical velocities (and velocity fluctuations) are equivalent in magnitude and thus are key to energy distribution and dissipation within the flow. Further, the presented data highlight the limitations of basing conclusions regarding body structure on a single cross-stream plane (particularly if that plane is central). Spectral analysis and dynamic mode decomposition of the fully three-dimensional, volumetric velocity data suggests internal waves within the current body that are associated with coherent three-dimensional motions in higher Reynolds number flows. Additionally, a potential critical layer at the height of the downstream velocity maximum is identified.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © The Author(s) 2023. This is an open access article under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits unrestricted use, distribution and reproduction in any medium, provided the original work is properly cited. |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Environment (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 29 Mar 2023 11:49 |
Last Modified: | 29 Mar 2023 11:49 |
Status: | Published |
Publisher: | Springer |
Identification Number: | 10.1007/s00348-023-03599-7 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:197804 |