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Current induced instability of two circular cylinders

Wu, W. and Huang, S. and Barltrop, N. (2002) Current induced instability of two circular cylinders. Applied Ocean Research, 24 (5). pp. 287-297. ISSN 0141-1187

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Abstract

The mean lift and drag forces on a cylinder placed in the wake of another upstream cylinder are investigated in the paper as well as the influence of these forces on the stability of the downstream cylinder. It is assumed that the two cylinders have the same diameter with the upstream cylinder always fixed. The forces are predicted based upon a free streamline model and the utilisation of some available experimental data. The stability of the downstream cylinder's equilibrium position is then analysed by finding eigenvalues of the linearised equation of motion. Numerical results of the lift and drag forces on the downstream cylinder are presented which are in a good agreement with the experimental data. It is found that under the influence of these forces the equilibrium position can become unstable through either the Hopf or stationary bifurcation depending upon the value of the mass parameter. For marine applications, the stationary bifurcation is the more likely scenario. The effect of the reduced velocity is identified in the paper.

Item type: Article
ID code: 4957
Keywords: marine riser, wake interaction, fluid-elastic stability, bifurcation, Naval architecture. Shipbuilding. Marine engineering, Ocean Engineering
Subjects: Naval Science > Naval architecture. Shipbuilding. Marine engineering
Department: Faculty of Engineering > Naval Architecture and Marine Engineering
Unknown Department
Related URLs:
    Depositing user: Strathprints Administrator
    Date Deposited: 06 Dec 2007
    Last modified: 04 Sep 2014 15:15
    URI: http://strathprints.strath.ac.uk/id/eprint/4957

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