### Abstract

Experiments have been conducted to investigate the vortex-induced vibration (VIV) response of a rigid section of a curved circular cylinder. Two curved configurations,

a concave and a convex, were tested regarding the direction of the flow, in addition to a straight cylinder that served as reference. Amplitude and frequency response are presented versus reduced velocity for a Reynolds number range between 750 and 15,000. Results showed that the curved cylinders presented significant less vibration for both concave and convex configurations when compared to the typical VIV response of a straight cylinder. The concave configuration presented relatively high amplitudes of vibration that are sustained beyond the typical synchronisation region. We believe this distinct behaviour between the convex and the concave configurations is related to the wake interference happening in the lower half of the curvature due to perturbations

generated in the horizontal section when it is positioned upstream. Particle-image velocimetry (PIV) measurements of the separated flow along the cylinder highlight the effect of curvature on vortex formation and excitation revealing a complex fluid-structure interaction mechanism.

a concave and a convex, were tested regarding the direction of the flow, in addition to a straight cylinder that served as reference. Amplitude and frequency response are presented versus reduced velocity for a Reynolds number range between 750 and 15,000. Results showed that the curved cylinders presented significant less vibration for both concave and convex configurations when compared to the typical VIV response of a straight cylinder. The concave configuration presented relatively high amplitudes of vibration that are sustained beyond the typical synchronisation region. We believe this distinct behaviour between the convex and the concave configurations is related to the wake interference happening in the lower half of the curvature due to perturbations

generated in the horizontal section when it is positioned upstream. Particle-image velocimetry (PIV) measurements of the separated flow along the cylinder highlight the effect of curvature on vortex formation and excitation revealing a complex fluid-structure interaction mechanism.

Original language | English |
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Title of host publication | Proceedings of the 10th International conference on Flow-Induced Vibration (& Flow-Induce Noise) |

Editors | C. Meskell, G. Bennett |

Pages | 543-554 |

Number of pages | 12 |

Publication status | Published - Jul 2012 |

Event | 10th Int. Conference on Flow-Induced Vibration (& Flow-Induced Noise) - Dublin, Ireland Duration: 2 Jul 2012 → … |

### Conference

Conference | 10th Int. Conference on Flow-Induced Vibration (& Flow-Induced Noise) |
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Country | Ireland |

City | Dublin |

Period | 2/07/12 → … |

### Keywords

- engineering
- flow induced vibration
- vibration
- flow induced noise

## Cite this

Assi, G., Freire, C., Korkischko, I., & Srinil, N. (2012). Experimental investigation of the flow-induced vibration of a curved circular cylinder. In C. Meskell, & G. Bennett (Eds.),

*Proceedings of the 10th International conference on Flow-Induced Vibration (& Flow-Induce Noise)*(pp. 543-554)