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RESEARCH PAPERS: Offshore Mechanics/Ocean Engineering

The Influence of Boundary Layer Velocity Gradients and Bed Proximity on Vortex Shedding From Free Spanning Pipelines

[+] Author and Article Information
A. J. Grass

Department of Civil Engineering, University College London, London, U.K.

P. W. J. Raven, R. J. Stuart

J. P. Kenny & Partners Ltd., London, U.K.

J. A. Bray

Marine Technology Support Unit (AERE), Harwell, U.K.

J. Energy Resour. Technol 106(1), 70-78 (Mar 01, 1984) (9 pages) doi:10.1115/1.3231028 History: Received August 01, 1983; Revised November 04, 1983; Online October 22, 2009

Abstract

The paper summarizes the results of a laboratory study of the separate and combined effects of bed proximity and large velocity gradients on the frequency of vortex shedding from pipeline spans immersed in the thick boundary layers of tidal currents. This investigation forms part of a wider project concerned with the assessment of span stability. The measurements show that in the case of both sheared and uniform approach flows, with and without velocity gradients, respectively, the Strouhal number defining the vortex shedding frequency progressively increases as the gap between the pipe base and the bed is reduced below two pipe diameters. The maximum increase in vortex shedding Strouhal number, recorded close to the bed in an approach flow with large velocity gradients, was of the order of 25 percent.

Copyright © 1984 by ASME
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