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Three-dimensional transverse instabilities in detached boundary layers

type de publication      article dans une revue internationale avec comité de lecture
date de publication 2007
auteur(s) Gallaire Francois; Marquillie Matthieu; Ehrenstein Uwe
journal (abréviation) Journal of Fluid Mechanics (J. Fluid Mech.)
volume (numéro) 571
pages 221 – 233
résumé A direct numerical simulation of the incompressible Navier–Stokes equations of the flow over a bump shows a stationary longitudinal instability at a Reynolds number of Re = 400. A three-dimensional global mode linear analysis is used to interpret these results and shows that the most unstable eigenmode is steady and localized in the recirculation bubble, with spanwise wavelength of approximately ten bump heights. An inviscid geometrical optics analysis along closed streamlines is then proposed and modified to account for viscous effects. This motivates a final discussion regarding the physical origin of the observed instability.
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