Current induced instability of two circular cylinders

W. Wu, S. Huang, N. Barltrop

Research output: Contribution to journalArticle

15 Citations (Scopus)

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.
LanguageEnglish
Pages287-297
Number of pages10
JournalApplied Ocean Research
Volume24
Issue number5
DOIs
Publication statusPublished - Oct 2002

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Induced currents
Circular cylinders
Drag
Marine applications
Equations of motion

Keywords

  • marine riser
  • wake interaction
  • fluid-elastic stability
  • bifurcation

Cite this

Wu, W. ; Huang, S. ; Barltrop, N. / Current induced instability of two circular cylinders. In: Applied Ocean Research. 2002 ; Vol. 24, No. 5. pp. 287-297.
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Current induced instability of two circular cylinders. / Wu, W.; Huang, S.; Barltrop, N.

In: Applied Ocean Research, Vol. 24, No. 5, 10.2002, p. 287-297.

Research output: Contribution to journalArticle

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AU - Wu, W.

AU - Huang, S.

AU - Barltrop, N.

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AB - 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.

KW - marine riser

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KW - fluid-elastic stability

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