Experimental studies of a transitional shock-wave--boundary-layer interaction identify robust streaklike flow structures. In order to account for the emergence of these three-dimensional flow features, growth of small initial perturbations around the two-dimensional laminar base flow is examined. The most significant transient amplification originates from the upstream streamwise vortices, which are not related to modal instabilities. Unique to separated high-speed flows, the impinging shock compresses the boundary layer, thereby causing the growth of the streaks.
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Dwivedi et al. (2020) studied this question.
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