Evolution of Three-Dimensional Flow Field and Vortex Structures around a Single Spur Dike during the Scouring Process
Publication: Journal of Hydraulic Engineering
Volume 150, Issue 1
Abstract
Large eddy simulation (LES) was conducted to better understand the evolution of the flow field and vortex structures near a single spur dike. The fixed-bed boundaries used in the simulations were reconstructed from the topography measured during the experiments at several representative times. The numerical results showed that the presence of a scour hole increases the passage area for the flow near the bed such that more fluid in the upper layer is transformed into the downflow, resulting in a stronger near-wall jet. This enhanced jet weakens the rotational strength of the primary horseshoe vortex (HV1), causing it to be dominated by the backflow mode. With further development of scouring, HV1 is able to regain its strength and stability. In addition, a spiral flow with an approximately vertical axis of rotation is gradually formed owing to topographic changes. The low-pressure core near the bed inside this spiral flow results in the development of excess pore water pressure in the sand layer, which could decrease the effective shear stress in the sand layer and cause upward seepage.
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Data Availability Statement
All data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
The authors would like to acknowledge the financial grants from the Hong Kong Research Grants Council (T21-602/16-R & RGC R5037-18), the national project of China (No. 6140206040301), the Shenzhen Science and Technology Program (No. JCYJ20220818102012024) and Hong Kong Research Grants Council (Polyu 152230/17E). The authors would like to thank the anonymous reviewers for providing numerous constructive suggestions.
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Published In
Journal of Hydraulic Engineering
Volume 150 • Issue 1 • January 2024
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© 2023 American Society of Civil Engineers.
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Received: Dec 20, 2022
Accepted: Sep 3, 2023
Published online: Nov 2, 2023
Published in print: Jan 1, 2024
Discussion open until: Apr 2, 2024
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