Journal article
The vortex shedding around four circular cylinders in an in-line square configuration
Physics of Fluids, Vol.26(2), 24112
01/02/2014
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Abstract
This paper presents a numerical study of three-dimensional (3D) vortex shedding flow in the wake of four circular cylinders in a square configuration with a constant space-to-diameter ratio of 2. Numerical tests are carried out for Reynolds number (Re) in the range from 100 to 500. Four wake flow regimes are identified at this spacing ratio. Regime 1 (100 <= Re <= 220) is characterized by the inclination of weak spanwise vortices and weak streamwise vortices, where the wake behind four cylinder array shares similar features to that behind a single cylinder with a large equivalent diameter. It is observed that the onset of three-dimensionality in the wake behind four cylinder array occurs at lower Re than that behind a single cylinder. Regime 2 (240 <= Re <= 300) is characterized by the appearance of the regular wavy spanwise vortices and rib-shaped streamwise vortices. The wavelength of the spanwise vortices is about 1.2 and the wake flow is similar to the transition mode B of a single cylinder. Regime 3 (320 <= Re <= 380) is characterized by severe vortex dislocations in the wake of the cylinders and regime 4 (400 <= Re <= 500) is characterized by the absence of vortex dislocations and the strong streamwise vortices. The flow between the upstream and the downstream cylinders is predominantly two-dimensional in regimes 1, 2, and 3 and becomes 3D in regime 4. Physical mechanisms responsible for different flow regimes are proposed and discussed in details. Significant changes in the root-mean-square force coefficients, wake formation length, and phase angle of the lift coefficients on the downstream cylinders are observed when the flow transits from one regime to another. (C) 2014 AIP Publishing LLC.
Details
- Title
- The vortex shedding around four circular cylinders in an in-line square configuration
- Creators
- Feifei Tong - Supreme Council Of HealthLiang Cheng - Supreme Council Of HealthMing Zhao - Western Sydney UniversityTongming Zhou - Supreme Council Of HealthXiao-bo Chen - BV, Res Dept, F-92570 Neuilly Sur Seine, France
- Publication Details
- Physics of Fluids, Vol.26(2), 24112
- Comment
- The first author would like to acknowledge the support of the Australian Government and The University of Western Australia by providing SIRF and UIS scholarships for a doctoral degree.
- Publisher
- A I P Publishing LLC
- Number of pages
- 20
- Grant note
- This work was supported by Australian Research Council Discovery Grant (Project ID: DP110105171) and by iVEC through the use of advanced computing resources located at iVEC@Murdoch.
- Identifiers
- 991013041312402368
- Academic Unit
- Faculty of Science and Engineering
- Language
- English
- Resource Type
- Journal article