Journal article
Modes of synchronisation in the wake of a streamwise oscillatory cylinder
Journal of Fluid Mechanics, Vol.832, pp.146-169
10/12/2017
Metrics
8 Record Views
UN Sustainable Development Goals (SDGs)
This output has contributed to the advancement of the following goals:
Source: InCites
Abstract
A numerical analysis of flow around a circular cylinder oscillating in-line with a steady flow is carried out over a range of driving frequencies. (f(d)) relatively low amplitudes. (A) a constant Reynolds number of 175 (based on the free-stream velocity). The vortex shedding is investigated, especially when the shedding frequency. fs/synchronises with the driving frequency. A series of modes of synchronisation are presented, which are referred to as the p/q modes, where p and q are natural numbers. When a p/q mode occurs, fs is detuned to. p/f(d), representing the shedding of p pairs of vortices over q cycles of cylinder oscillation. The p/q modes are further characterised by the periodicity of the transverse force over every q cycles of oscillation and a spatial-temporal symmetry possessed by the global wake. The synchronisation modes. p/q with relatively small natural numbers are less sensitive to the change of external control parameters than those with large natural numbers, while the latter is featured with a narrow space of occurrence. Although the mode of synchronisation can be almost any rational ratio (as shown for p and q smaller than 10), the probability of occurrence of synchronisation modes with q being an even number is much higher than q being an odd number, which is believed to be influenced by the natural even distribution of vortices in the wake of a stationary cylinder.
Details
- Title
- Modes of synchronisation in the wake of a streamwise oscillatory cylinder
- Creators
- Guoqian Tang - Dalian UniversityLiang Cheng - Dalian University of TechnologyFeifei Tong - The University of Western AustraliaLin Lu - Dalian University of TechnologyMing Zhao - Western Sydney University
- Publication Details
- Journal of Fluid Mechanics, Vol.832, pp.146-169
- Publisher
- Cambridge Univ Press
- Number of pages
- 24
- Grant note
- 51409035; 51479025; 51490673 / NSFC of China; National Natural Science Foundation of China (NSFC) Australian Government; CGIAR Government of Western Australia DP110105171; DP130103619 / Australian Research Council 2014M551089 / China Postdoctoral Science Foundation
- Identifiers
- 991013042412802368
- Academic Unit
- Faculty of Science and Engineering
- Language
- English
- Resource Type
- Journal article