Free access article

ESAIM: Proc., 1999, Vol. 7, pp. 151-160
DOI: 10.1051/proc:1999014

The effects of ambient stratification on the crow instability and subsequent vortex reconnection

J. F. Garten, J. Werne, D. C. Fritts and S. Arendt

Colorado Research Associates, 3380 Mitchell Lane, Boulder, CO 80301, United States

Abstract
We discuss the results of direct numerical simulations of three-dimensional (3D) anti-parallel vortex pairs evolving in ambient stratification for a range of Reynolds ( Re ) and Froude ( Fr ) numbers. These results have relevance to both the study of aircraft trailing vortices, which can pose considerable hazard to following aircraft (see, e.g., Olsen et al. 1971), and the general topic of vortex reconnection, an important process in fully-developed turbulence and other complex flows (see, e.g., Rogers & Moin 1988, Melander & Hussain 1988).

© EDP Sciences, ESAIM 1999

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