Flow interaction between a streamwise oscillating cylinder and a downstream stationary cylinder

Xu, S.J.; Gan, L.; Zhou, Y.

Abstract

In this paper, we present some experimental results about the physical effects of a cylinder’s streamwise oscillation motion on a downstream one in a tandem arrangement. The upstream cylinder undergoes a controlled simple harmonic oscillation at amplitudes A/d = 0.2–0.8, where d is the cylinder diameter, and the frequency ratio of fe/fsfe/fs = 0–3.0, where fefe is the cylinder oscillation frequency and fsfs is the natural frequency of vortex shedding from a single stationary cylinder. Under these conditions, the vortex shedding is locked to the controlled oscillation motion. Flow visualisation using the planar laser-induced fluorescence and qualitative measurements using hot-wire anemometry reveal three distinct flow regimes behind the downstream cylinder. For fe/fs>(fe/fs)cfe/fs>(fe/fs)c , where (fe/fs)c(fe/fs)c is a critical frequency ratio which depends on A/d and Reynolds number Re, a so-called SA-mode occurs. The upstream oscillating cylinder generates binary vortices symmetrically arranged about the centreline, each containing a pair of counter-rotating vortices, and the downstream cylinder sheds vortices alternately at 0.5fe0.5fe . For 0.7–1.0

Citation

Xu, S., Gan, L., & Zhou, Y. (2016). Flow interaction between a streamwise oscillating cylinder and a downstream stationary cylinder. Experiments in Fluids, 57(11), Article 173. https://doi.org/10.1007/s00348-016-2265-y

• Journal Article Type: Article
• Acceptance Date: Oct 11, 2016
• Online Publication Date: Oct 22, 2016
• Publication Date: Nov 1, 2016
• Deposit Date: Oct 12, 2016
• Publicly Available Date: Oct 22, 2017
• Journal: Experiments in Fluids
• Print ISSN: 0723-4864
• Electronic ISSN: 1432-1114
• Publisher: Springer
• Peer Reviewed: Peer Reviewed
• Volume: 57
• Issue: 11
• Article Number: 173
• DOI: https://doi.org/10.1007/s00348-016-2265-y
• Public URL: https://durham-repository.worktribe.com/output/1402974