Wake Transition in the flow around two circular cylinders in staggered arrangements
File(s)
Accepted version
Author(s)
Bruno S. Carmo
Spencer J. Sherwin
Peter W. Bearman
Richard H.J. Willden
Type
Journal Article
Abstract
The wake transition of the flow around two circular cylinders placed in staggered arrangements with fixed streamwise separation of 5D and cross stream separation varying from 0D to 3D has been studied. The wake transition is compared to that of a single isolated cylinder. Linear stability analysis utilising Floquet theory and direct numerical simulations using a spectral/hp element spatial discretisation were carried out. The unstable modes that first appear in the wake transition of the flow around a single cylinder, which are the long spanwise wavelength mode A and the short spanwise wavelength mode B, are also found in the flow around the staggered arrangements. However, a third mode, referred to as mode C, is also present in the wake transition of the flow around staggered arrangements, depending on the relative positioning of the cylinders. This mode has an intermediate spanwise wavelength and period-doubling character. The structure and onset characteristics of mode C are analysed and the non-linear character of the bifurcation for this mode is investigated.
Version
Accepted version
Date Issued
2008
Citation
Journal of Fluid Mechanics, 2008, 597, pp.1-29
ISSN
0022-1120
Start Page
1
End Page
29
Journal / Book Title
Journal of Fluid Mechanics
Volume
597
Copyright Statement
© Cambridge University Press 2008. This paper has been accepted for publication and will appear in a revised form, subsequent to peer review and/or editorial input by Cambridge University Press.
Identifier
http://www2.imperial.ac.uk/ssherw/spectralhp/papers/JFM-CaShBeWi-07.pdf
Source Volume Number
597