Onset of separation unsteadiness in hypersonic shock boundary layer interaction on a cone-step
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.
Cite
@article{arxiv.2512.07089,
title = {Onset of separation unsteadiness in hypersonic shock boundary layer interaction on a cone-step},
author = {Chase Jenquin and Eric L. Cui and Anubhav Dwivedi and G. S. Sidharth and Joseph S. Jewell},
journal= {arXiv preprint arXiv:2512.07089},
year = {2025}
}