Abstract
The asymmetry in the vortex patterns in a cross-flow plane near the wing-body juncture is related to the stagnant point displacement. For the first time, the time scale of this response is captured. This is done by analyzing digitized video images of the stagnation point actuator (SPA) motion and the asymmetry in the vortex pattern and constructing a time series spanning several seconds. The resulting time series is sampled, transformed to the frequency domain, and analyzed by standard methods in digital signal processing to compute the autospectra, the cross spectrum, the coherence function, and the complex transfer function
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