Localized self-sustaining processes in the asymptotic suction boundary layer

Abstract eng:
Strongly nonlinear three-dimensional interactions between a roll/streak structure and a Tollmien-Schlichting wave are considered at high Reynolds number in the asymptotic suction boundary layer. A brief derivation of the interaction equations will be given, followed by the presentation of the results of numerical computations corresponding to nonlinear travelling-wave states bifurcating from the lower branch linear neutral point. The states are observed to localize in the spanwise direction with increasing amplitude due to the formation of a singularity which slowly develops in the governing interaction equations.

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