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Wake fields behind risers undergoing vortex - induced vibration

Citation

Xu, J and Spencer, D and Gardner, A and Molynuex, D and Qiu, W and Bose, N and Masters, R and Shanks, J, Wake fields behind risers undergoing vortex - induced vibration, Proceedings of the 27th International Conference on Offshore Mechanics and Arctic Engineering, July 15 - 20 2008, Portugal, pp. 539-546 . ISBN 978-0-7918-4822-7 (2008) [Refereed Conference Paper]


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Copyright Statement

Copyright © 2008 by ASME

Official URL: http://www.asme.org/

DOI: doi:10.1115/OMAE2008-57068

Abstract

This paper presents measurements of the wake field behind three riser models obtained by using a Digital Particle Image Velocimetry (DPIV). The three riser models were a circular rigid cylinder, a cylinder fitted with fairings and a cylinder fitted with strakes. The models were free to vibrate in the cross-flow direction when towed in a uniform flow. The range of tested Reynolds number based on the diameter of the cylinder was from 3„e104 to 2.5„e105. The measurement results showed that the transverse vibration amplitudes for both the faired and straked cylinder were far less than those of the bare cylinder. Based on the wake flow field comparison between the models tested it was found that the modes of vortex shedding observed behind the bare cylinder did not occur behind either the faired or straked cylinder. This reveals that the vibrations responses of the cylinders are directly related to their wake modes. Strong, regularly shed vortices induce large amplitude vibration and weak, scattered vortices lead small amplitude or no vibration. The different wake patterns are presented for the three cylinders.

Item Details

Item Type:Refereed Conference Paper
Research Division:Engineering
Research Group:Maritime Engineering
Research Field:Ocean Engineering
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in Engineering
Author:Bose, N (Professor Neil Bose)
ID Code:54672
Year Published:2008
Deposited By:NC Maritime Engineering and Hydrodynamics
Deposited On:2009-02-26
Last Modified:2012-03-21
Downloads:5 View Download Statistics

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