Turbulent Flow Field around a Cylindrical Pier on a Gravel Bed
Publication: Journal of Hydraulic Engineering
Volume 149, Issue 10
Abstract
Turbulent flow around a circular pier on a gravel bed is investigated experimentally, using particle image velocimetry. The turbulent kinetic energy (TKE), Reynolds shear stress (RSS), and vorticity are examined to understand the effect of flow depth () to pier diameter () ratio and flow intensity. Additionally, spectrum analysis is carried out to examine the vortex intensity over various frequencies of eddies. Mixing of the horseshoe vortex and surface roller is observed in the upstream of pier for . Consequently, two opposite rotating vortices reduced the turbulence strength. The critical limit of on a gravel bed is found to be three times more than that of a sand bed. Both TKE and RSS increased approximately linearly with flow intensity. Further, vortex shedding frequency and energy of vortices increased with which attributed to an increase in the normalized equilibrium scour depth. The present study will be resourceful for researchers in developing scour models for gravel bed by giving more insights into the flow hydrodynamics with respect to approach flow parameters.
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Data Availability Statement
All data that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
The authors express their sincere thanks to the staff of the Hydraulics Laboratory of the Department of Civil Engineering, IIT Bombay, for their help and support. The authors acknowledge DST-FIST for the installation of a PIV system in the Hydraulic Laboratory. The authors are thankful to the editors and reviewers for their critical comments, which helped to improve the manuscript significantly.
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Information & Authors
Information
Published In
Journal of Hydraulic Engineering
Volume 149 • Issue 10 • October 2023
Copyright
© 2023 American Society of Civil Engineers.
History
Received: Apr 11, 2022
Accepted: May 21, 2023
Published online: Aug 9, 2023
Published in print: Oct 1, 2023
Discussion open until: Jan 9, 2024
ASCE Technical Topics:
- Bed materials
- Engineering fundamentals
- Engineering materials (by type)
- Field tests
- Flow (fluid dynamics)
- Fluid dynamics
- Fluid mechanics
- Gravels
- Hydraulic engineering
- Hydraulic structures
- Hydraulics
- Hydrologic engineering
- Infrastructure
- Materials engineering
- Particles
- Pavements
- Piers
- Ports and harbors
- River and stream beds
- River engineering
- Rivers and streams
- Scour
- Tests (by type)
- Transportation engineering
- Turbulent flow
- Vortices
- Water and water resources
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