Spatial optimal disturbances in swept attachment-line boundary layers

Alan Guégan (1) , Peter J. Schmid (1) , Patrick Huerre (1)

1 LadHyX - Laboratoire d'hydrodynamique

A formulation based on direct and adjoint parabolized equations is developed to account for the spatial evolution of perturbations in swept attachment-line boundary layers. For sweep Reynolds numbers larger than Re = 100 the dynamics is dominated by a lift-up mechanism which is responsible for large energy amplification by transforming spanwise vortices into spanwise streaks. This mechanism favours steady perturbations with a chordwise scale that quantitatively matches its counterpart for classical Blasius boundary layers. © 2008 Cambridge University Press.

Domains: Physics [physics]; Mechanics [physics]; Fluid mechanics [physics.class-ph]; Engineering Sciences [physics]; Mechanics [physics.med-ph]; Fluids mechanics [physics.class-ph]

Alan Guégan, Peter J. Schmid, Patrick Huerre. Spatial optimal disturbances in swept attachment-line boundary layers. Journal of Fluid Mechanics, 2008, 603 (mai), pp.179-188. ⟨10.1017/s0022112008001067⟩. ⟨hal-01022808⟩