Abstract
What drives flow unsteadiness in the shock wave/turbulent boundary layer interaction? Two mechanisms are widely recognized to play a role in this problem: upstream boundary layer forcing and downstream feedback. In this work, through the combined use of system identification, spectral decomposition, and linear stability analysis, we demonstrate that the downstream feedback, driven by upstream traveling acoustic waves, is the dominant mechanism behind the low-frequency shock motion. The tools described herein enable an accurate reconstruction of the shock fluctuations and could find potential applications in active flow control.
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