Bursting phenomenon created by bridge piers group in open channel flow

Environmental Fluid Mechanics - Tập 23 - Trang 125-140 - 2023
Nima Ikani1, Jaan H. Pu1, Tarek Taha1, Prashanth Reddy Hanmaiahgarib2, Nadia Penna3
1Faculty of Engineering and Informatics, University of Bradford, Bradford, UK
2Department of Civil Engineering, IIT Kharagpur, Kharagpur, India
3Department of Soil Conservation, University of Calabria, Arcavacata, Italy

Tóm tắt

Bridge pier is a common feature in hydraulic structure. Its impact to the river usually occurs in group form rather than single pier, so this challenging piers-group influence towards river hydraulics and turbulence needs to be explored. In this paper, the measurements were conducted using an Acoustic doppler velocimeter (ADV) to study velocities in three dimensions (longitudinal, transversal, and vertical). Based on the experimental data, we have observed reversed depth-averaged velocity vector after each pier in the group of three-pier. The analysis has been conducted on the contribution of each bursting event to Reynolds shear stress (RSS) generation, in order to identify the critical events and turbulence structures around the piers. In the upstream near-wake flow in the bed-wall layer, strong sweep and ejection events have been observed; while at downstream, sweeps were more dominant. The pattern of burst changed in the outer layer of flow, where ejections were more dominant. Furthermore, the contribution fractional ratio to RSS variation at hole size H = 0 indicates that sweeps and ejections were significantly generated at the near wake-flow in upstream.

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