DNS of aircraft wake vortices: the effect of stable stratification on the development of the Crow instability


Coleman, G.N., Johnstone, R., Yorke, C.P. and Castro, I.P., (2010) DNS of aircraft wake vortices: the effect of stable stratification on the development of the Crow instability Armenio, Vincenzo, Geurts, Bernard and Frolich, Jochen (eds.) In Direct and Large-Eddy Simulation VII. vol. 13, Springer., pp. 519-525. (doi:10.1007/978-90-481-3652-0_75).

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Description/Abstract

A numerical experiment is performed to determine the likelihood that the Crow instability will mitigate the potentially hazardous effects of the buoyancy-induced rebound of initially parallel line vortices. Parameters are chosen to correspond to wake vortices downstream of an elliptically loaded wing with large span (typical of the A380) landing in very stable conditions. The DNS is initiated by perturbing the vortex pair into the shape of the linearly most unstable Crow eigenmode, with a maximum displacement of 1% of the initial distance between the pair. Under these conditions, the Crow instability progresses fast enough to break the two dimensionality of the vortex system before it returns to its original elevation. This suggests that in many cases the Crow instability will prevent the rebounding vorticity from being a serious danger to following aircraft. Whether or not this will always happen in practice is an open question, requiring further investigation

Item Type: Conference or Workshop Item (Paper)
Digital Object Identifier (DOI): doi:10.1007/978-90-481-3652-0_75
ISBNs: 9789048136520 (print)
Venue - Dates: Proceedings of the Seventh International ERCOFTAC Workshop on Direct and Large-Eddy Simulation, Italy, 2008-09-08 - 2008-09-10
Subjects: T Technology > TL Motor vehicles. Aeronautics. Astronautics
Organisations: Aerodynamics & Flight Mechanics Group
ePrint ID: 300658
Date :
Date Event
2010Published
Date Deposited: 29 Feb 2012 09:23
Last Modified: 17 Apr 2017 17:30
Further Information:Google Scholar
URI: http://eprints.soton.ac.uk/id/eprint/300658

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