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Experiments with flexible shrouds to reduce the vortex-induced vibration of a cylinder with low mass and damping

Cicolin, M. M. and Assi, G. R. S. (2017) Experiments with flexible shrouds to reduce the vortex-induced vibration of a cylinder with low mass and damping. Applied Ocean Research, 65 . pp. 290-301. ISSN 0141-1187. http://resolver.caltech.edu/CaltechAUTHORS:20170706-130619053

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Abstract

Experiments employing a low-mass-damping cylinder have been conducted to determine the vortex-induced vibration (VIV) response of four suppressors of the flexible-shroud family. The VIV suppressors were inspired in the concept of the Ventilated Trousers (VT), a flexible shroud composed of a flexible net fitted with three-dimensional bobbins. Reynolds number varied between 5 × 10^3 and 25 × 10^3, while reduced velocity varied from 2 to 26. The VIV dynamic response showed that the VT suppressed the peak amplitude of vibration down to 40% of that of a bare cylinder. Other flexible shrouds also achieved suppression, but not as efficiently. Drag was reduced during the VIV synchronization range, but remained above the value for a bare static cylinder thereafter. Spectral analysis of displacement and lift revealed that, depending on the geometry and distribution of the bobbins, the flexible shroud can develop an unstable behavior, capturing energy from the wake and sustaining vibrations for higher reduced velocities. PIV measurements of the wake revealed that the entrainment flow through the mesh is necessary to extend the vortex-formation length of the wake; this mechanism only occurs for the VT mesh.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1016/j.apor.2017.04.003DOIArticle
http://www.sciencedirect.com/science/article/pii/S0141118716305958PublisherArticle
Additional Information:© 2017 Elsevier Ltd. Received 23 December 2016, Accepted 3 April 2017, Available online 9 May 2017.
Group:GALCIT
Subject Keywords:Vortex-induced vibration; Suppression; Flexible shroud; Drag reduction; Ventilated trousers
Record Number:CaltechAUTHORS:20170706-130619053
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20170706-130619053
Official Citation:M.M. Cicolin, G.R.S. Assi, Experiments with flexible shrouds to reduce the vortex-induced vibration of a cylinder with low mass and damping, Applied Ocean Research, Volume 65, April 2017, Pages 290-301, ISSN 0141-1187, https://doi.org/10.1016/j.apor.2017.04.003. (http://www.sciencedirect.com/science/article/pii/S0141118716305958)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:78812
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:06 Jul 2017 21:19
Last Modified:06 Jul 2017 21:19

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