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Effect on a laminar boundary layer of small-amplitude streamwise vorticity in the upstream flow. (English) Zbl 1010.76029
The authors apply a predominantly numerical technique based on perturbation approach to study the effect of small free-stream disturbances on flat-plate boundary layers. Accurate numerical computations reveal that two regions of enhanced instability can emerge as the boundary-layer velocity profiles become sufficiently nonlinear. The first region appears relatively close to the wall, while the second lies in the outer domain of the boundary layer. A comparison with Klebanoff-mode experiments is given, and some of experimental observations are explained heuristically.

MSC:
76E05 Parallel shear flows in hydrodynamic stability
76D10 Boundary-layer theory, separation and reattachment, higher-order effects
76M45 Asymptotic methods, singular perturbations applied to problems in fluid mechanics
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