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Issue ESAIM: Proc.
Volume 7, 1999
Third International Workshop on Vortex Flows and Related Numerical Methods
Page(s) 397 - 407
DOI http://dx.doi.org/10.1051/proc:1999037

ESAIM: Proc., 1999, Vol. 7, pp. 397-407
DOI: 10.1051/proc:1999037

Theoretical and numerical analysis of wake vortices

D. Sipp, F. Coppens and L. Jacquin

ONERA, 29, avenue de la Division Leclerc, BP 72 F-92322 CHATILLON CEDEX


Abstract
The first part of the paper analyses the linear dynamics of a vortex pair thanks to a normal mode analysis. The basic flow is a superposition of two Lamb-Oseen vortices of radius a and distance b. The long-wave Crow instability and the short-wave Widnall instabilities are fully characterized for different aspect ratios a/b of the vortex pair. In particular, as a/b increases, it is shown that the antisymmetric Widnall instabilities are favoured for short-wave perturbations. This constitutes an explanation for the results obtained by Leweke & Williamson (1998). The second part of the paper deals with turbulence in the Batchelor vortex. A 3D Large Eddy Simulation (LES) shows that, starting from a linearly unstable wake-type vortex, high levels of turbulence can be obtained. But, the mean-flow then rapidly evolves towards a stable state. These results are in accordance with those of Ragab & Sreedhar (1995).



© EDP Sciences, ESAIM 1999

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