The flow around stationary and elastically-mounted circular cylinders in tandem and staggered arrangements

M. D. Griffith, D. Lo Jacono, J. Sheridan, J. Leontini

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A numerical study is presented of the flow around two circular cylinders in tandem and staggered arrangements in a freestream, examining the fluid forces and vortex-shedding behaviour, as well as the oscillation of both cylinders when allowed to move and vibrate in response to the flow. The streamwise distance between the cylinder centres is 1.5 diameters, while the crossstream offset is varied from 0.0 to 5.0. The Reynolds number, based on cylinder diameter, D, and freestream velocity, U, is 200. Reduced velocity, (Formula presented.), where fN is the spring natural frequency, is varied from 0.0 to 14.0. Results are obtained using a sharp-interface immersed boundary finite-difference method. For the stationary cylinders a range of behaviours are observed over the cylinder offset range, including a difference in primary vortex-shedding frequency when the crossstream offset is greater than 1.5D. For the elastic-mounting, in contrast to existing results in the literature, three modes of vortex-shedding and oscillation are observed over the U* range for the tandem arrangement. These modes are distinct in the phase difference between the front and rear cylinder oscillation, as well as the number of vortices shed from each cylinder.

Original languageEnglish
Title of host publicationProceedings of the 20th Australasian Fluid Mechanics Conference, AFMC 2016
PublisherAustralasian Fluid Mechanics Society
ISBN (Electronic)9781740523776
Publication statusPublished - 2016
EventAustralasian Fluid Mechanics Conference 2016 - The University of Western Australia, Perth, Australia
Duration: 5 Dec 20168 Dec 2016
Conference number: 20th


ConferenceAustralasian Fluid Mechanics Conference 2016
Abbreviated titleAFMC 2016

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