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Coherent structures in the breakdown bubble of a vortex flow

Paterson, Oliver; Wang, Bofu; Mao, Xuerui

Authors

Oliver Paterson

Bofu Wang

XUERUI MAO XUERUI.MAO@NOTTINGHAM.AC.UK
Associate Professor



Abstract

Helical structures downstream of the breakdown-bubble of the Grabowski vortex profile at Reynolds numbers Re< or = 500 have been extensively studied through stability analysis in the literature. However, the low-frequency coherent structures inside the bubble, which have been observed in experiments, were not predicted by the stability approach. In the present work, asymptotic stabilities of the Grabowski vortex flow at Re < or = 1000 are carried out to compare against previous works, and then the linear optimal inflow perturbation and the corresponding outcome are studied to unveil the dynamics inside the bubble. It is found that low frequency inflow perturbations penetrate the bubble and are amplified to coherent structures, while high frequency perturbations are convected around the border of the bubble. These linearised results agree well with previous experimental observations and are validated by direct numerical simulations.

Citation

Paterson, O., Wang, B., & Mao, X. (2018). Coherent structures in the breakdown bubble of a vortex flow. AIAA Journal, 56(5), https://doi.org/10.2514/1.J055329

Journal Article Type Article
Acceptance Date Jan 15, 2018
Online Publication Date Mar 23, 2018
Publication Date May 30, 2018
Deposit Date Feb 6, 2018
Publicly Available Date Mar 23, 2018
Journal AIAA Journal
Print ISSN 0001-1452
Electronic ISSN 1533-385X
Publisher American Institute of Aeronautics and Astronautics
Peer Reviewed Peer Reviewed
Volume 56
Issue 5
DOI https://doi.org/10.2514/1.J055329
Public URL http://eprints.nottingham.ac.uk/id/eprint/49569
Publisher URL https://arc.aiaa.org/doi/10.2514/1.J055329
Copyright Statement Copyright information regarding this work can be found at the following address: http://eprints.nottingham.ac.uk/end_user_agreement.pdf

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://eprints.nottingham.ac.uk/end_user_agreement.pdf





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