SUPPRESSION OF VORTEX SHEDDING WITH ROTATING WAKE-CONTROL CYLINDERS: NUMERICAL INVESTIGATION AT A MODERATE REYNOLDS NUMBER

Author(s)

Assi, Gustavo R. S. ; Orselli, Reinaldo M. ; Silva-Ortega, Mariana ; ASME

• Document type: Journal article
• Source: PROCEEDINGS OF THE ASME 37TH INTERNATIONAL CONFERENCE ON OCEAN, OFFSHORE AND ARCTIC ENGINEERING, 2018, VOL 2; v. N/A, p. 11-pg., 2018-01-01.

Abstract

This paper presents an investigation of the suppression of vortex shedding of a larger circular cylinder by the interference of smaller rotating wake-control cylinders positioned around its center. Three-dimensional numerical simulations have been conducted at a moderate Reynolds number of 10,000, thus complementing the previous experimental results by offering a better understanding of the physical mechanisms behind the suppression. Visualization of the vortex wakes revealed a complex disruption of the vortex tubes for the higher rotation speeds, with consequent reduction in the mean drag of almost 52% when compared with that of a bare cylinder. Fluctuating lift has also been drastically reduced in 90%. Configurations of control cylinder that can suppress vortex shedding may produce more efficient suppressors for flow-induced vibrations. (AU)

• FAPESP's process: 14/50279-4 - Brasil Research Centre for Gas Innovation
• Grantee: Julio Romano Meneghini
• Support Opportunities: 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 Opportunities: Regular Research Grants