Retro lock-in in the wake-induced vibration of a pair of tandem cylinders in close proximity

Full text
Author(s):	Assi, Gustavo R. S. Total Authors: 1
Document type:	Journal article
Source:	JOURNAL OF FLUIDS AND STRUCTURES; v. 133, p. 14-pg., 2025-03-01.
Abstract
An experimental investigation performed at moderate Reynolds numbers was set to study how a pair of tandem cylinders can be excited into flow-induced vibrations by different interference mechanisms as a function of longitudinal spacings varying from 2 to 10 diameters. Results showed that the downstream cylinder could develop vortex-induced vibration (VIV) caused by its own vortex shedding, wake-induced vibration (WIV) caused by a developed wake formed in the gap, and gap-flow-switching. A combination of these mechanisms appeared for cases under close proximity. For a specific spacing of 3 diameters, the vibration of the downstream cylinder was able to synchronize the vortex shedding from the upstream, fixed body. We call this mechanism "retro lock-in" since the vortex-formation process of a bluff body was governed by the dynamics of another body located further downstream. (AU)

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 Opportunities:	Regular Research Grants


FAPESP's process:	22/03698-8 - OTIC Offshore Technology Innovation Centre
Grantee:	Kazuo Nishimoto
Support Opportunities:	Research Grants - Research Centers in Engineering Program