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The Separated Flow Around a Circular Bridge Pier

by F. Wen, Univ of California, Berkeley, United States,
D. Seymour, Univ of California, Berkeley, United States,
H. W. Shen, Univ of California, Berkeley, United States,



Document Type: Proceeding Paper

Part of: Hydraulic Engineering

Abstract:

The unsteady separated flows around a flat plate/cylinder junction and a scour hole/cylinder junction were investigated experimentally. The flow in the plane of symmetry was presented. Around a flat plate/cylinder junction, the horseshoe vortex undergoes steady single and multiple vortex regimes, and unsteady regime as the Reynolds number, Re_D, is increased systematically. For the high Reynolds number flows, the horseshoe vortex moves upstream and close to the flat surface. In the unsteady regime, oscillation and merging of vortices were observed. Steady single and multiple vortex regimes also exist in the flow around a scour hole/cylinder junction, although the position of the vortices changes little with the Re_D.

Subject Headings: Vortices | Flow separation | Scour | Unsteady flow | Piers | Reynolds number | Bridge components

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