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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Laboratory-scale investigation of the Ventilated-Trousers device acting as a suppressor of vortex-induced vibrations

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Cicolin, M. M. ; Assi, G. R. S.
Total Authors: 2
Document type: Journal article
Source: OCEAN ENGINEERING; v. 142, p. 411-418, SEP 15 2017.
Web of Science Citations: 0

Experiments have been carried out with circular cylinders fitted with a suppressor of vortex-induced vibrations called the Ventilated Trousers (VT). Tests were performed at laboratory scale in a free-surface water channel with fixed and free-to-respond models in one degree of freedom. The oscillating tests were performed with elastically mounted cylinders with low mass and damping (m{*}zeta < 0.009). Reynolds number varied from 5000 to 25000 and reduced velocity varied between 2 and 15. Tests with fixed models showed that the VT increased the mean drag and practically eliminated the fluctuating lift force when compared to a bare fixed cylinder. Free response tests showed that the VT was able to reduce 60% of the peak amplitude of vibration, thus reducing the maximum drag compared with that of a bare oscillating cylinder. Three hypotheses are proposed to explain the physical mechanism underlying the suppression by the VT: local disruption of vortex shedding; three-dimensional disruption of the near wake; and the increase of hydrodynamic damping. (AU)

FAPESP's process: 14/50279-4 - Brasil Research Centre for Gas Innovation
Grantee:Julio Romano Meneghini
Support type: Research Grants - Research Centers in Engineering Program
FAPESP's process: 11/00205-6 - Investigation of new methods for suppressing flow-induced vibrations of offshore structures
Grantee:Gustavo Roque da Silva Assi
Support type: Regular Research Grants