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arXiv · 2512.07089

Onset of separation unsteadiness in hypersonic shock boundary layer interaction on a cone-step

Chase Jenquin·Eric L. Cui·Anubhav Dwivedi·G. S. Sidharth·Joseph S. Jewell
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Abstract

Shock-boundary layer interactions (SBLI) on hypersonic cone step flows exhibit a range of intrinsic unsteady behaviors, from shear-layer oscillations to large-scale pulsations. This work investigates the unsteadiness in a cone-step geometry at Mach 6 under quiet flow conditions at different freestream Reynolds numbers using time-resolved Schlieren imaging and spectral proper orthogonal decomposition (SPOD). Experimental results are compared with high-fidelity axisymmetric and three-dimensional simulations. Results demonstrate regime transition in the parameter space, across the unsteadiness boundary, all the way from shear-layer breakdown to shock system oscillations and ultimately to large-amplitude pulsations. The dominant mode in the experiments and the simulations corresponds to a Strouhal number St ~ 0.17 for small oscillations reducing to St ~ 0.13 for large pulsations. A detailed description of the unsteady shock dynamics, the instability of the shear layer during onset of unsteadiness and an analysis of the nonlinear limit cycle is presented.

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Chase Jenquin, Eric L. Cui, Anubhav Dwivedi, G. S. Sidharth, Joseph S. Jewell. 2025-12-08. Onset of separation unsteadiness in hypersonic shock boundary layer interaction on a cone-step. https://arxiv.org/abs/2512.07089

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