Abstract
A response of flat plate boundary layer to a single free-stream axial vortex of limited spanwise extent with periodically modulated strength is investigated. The response is dominated by a streamwise velocity perturbation (streak), whose characteristics are in agreement with data of previous experiments performed with natural streaks developed under the effect of free-stream turbulence. This confirms that the experimental approach used is suitable for an accurate modeling of the low-frequency natural streaks in controlled conditions. A quantitative comparison of the observed streak characteristics with available theoretical approaches is performed.
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