Bury, Yannick and Jardin, Thierry
Wake instabilities behind an axisymmetric bluff body at low Reynolds numbers.
(2014)
In:
Turbulence and Interactions: Proceedings of the TI 2012 conference.
(Notes on Numerical Fluid Mechanics and Multidisciplinary Design).
Springer, 31-37.
ISBN 978-3-662-43489-5
![]() |
(Document in English)
PDF (Author's version) - Depositor and staff only - Requires a PDF viewer such as GSview, Xpdf or Adobe Acrobat Reader 2MB |
Official URL: http://doi.org/10.1007/978-3-662-43489-5
Abstract
This paper aims at understanding the dynamical process that leads to the onset of chaos in the flow past a blunt based axisymmetric bluff body. On the ba- sis of direct numerical simulations, conducted for Reynolds numbers ranging from 100 to 800, we show that the flow undergoes multiple transitions, successively giv- ing rise to the SS, RSPa, RSPb and RSPc wake states. In particular, the RSPc state, revealed in this work via long-term computations, is characterized by intermittent vortex stretching denoting the onset of chaos and the potential occurence of a third instability that superimposes to the first and second instability associated with state RSPa and RSPb respectively. Interestingly, the reflectional symmetry plane that characterizes the RSP states is still retained. Hence, chaos is triggered before the symmetry breaking and the occurence of the RSB state observed at higher Reynolds numbers.
Item Type: | Book Section |
---|---|
Audience (conference): | International conference proceedings |
Uncontrolled Keywords: | |
Institution: | Université de Toulouse > Institut Supérieur de l'Aéronautique et de l'Espace - ISAE-SUPAERO (FRANCE) |
Laboratory name: | |
Statistics: | download |
Deposited By: | Yannick Bury |
Deposited On: | 11 Dec 2012 10:26 |
Repository Staff Only: item control page