Spatial optimal disturbances in swept attachment-line boundary layers

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

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