Input-output analysis of shock boundary layer interaction

Anubhav Dwivedi, G. S. Sidharth, Graham V. Candler, Joseph W. Nichols, Mihailo R. Jovanović

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Scopus citations


Understanding transition mechanisms in high speed boundary layers is important for predictive design and control in aeronautics. Shock boundary layer interaction, in which the inviscid pressure rise causes the incoming boundary layer to separate and reattach downstream, has a destabilizing effect on the flow. The presence of a recirculation bubble and highly concave curvature of the streamlines near reattachment can support large growth of perturbations. In this paper, we investigate the receptivity properties of an asymptotically stable shock boundary layer interaction on a slender double wedge. The optimal frequency response of the two-dimensional steady state flow subjected to external perturbations is computed. It is found that the flow is highly receptive to low-frequency streamwise vorticity perturbations of a specific spanwise wavelength in the incoming boundary layer. This results in growth of streaks post-reattachment. The most amplified spanwise wavelength scales with approximately twice the boundary layer thickness at reattachment. By excluding the role of bubble dynamics in the input-output analysis, we find that recirculation bubble plays an important role in the perturbation growth and the spanwise wavelength selection. The present work demonstrates the efficacy of input-output analysis for investigating the stability and sensitivity of compressible boundary layer flows.

Original languageEnglish (US)
Title of host publication2018 Fluid Dynamics Conference
PublisherAmerican Institute of Aeronautics and Astronautics Inc, AIAA
ISBN (Print)9781624105531
StatePublished - 2018
Event48th AIAA Fluid Dynamics Conference, 2018 - Atlanta, United States
Duration: Jun 25 2018Jun 29 2018

Publication series

Name2018 Fluid Dynamics Conference


Other48th AIAA Fluid Dynamics Conference, 2018
CountryUnited States

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    Dwivedi, A., Sidharth, G. S., Candler, G. V., Nichols, J. W., & Jovanović, M. R. (2018). Input-output analysis of shock boundary layer interaction. In 2018 Fluid Dynamics Conference [AIAA 2018-3220] (2018 Fluid Dynamics Conference). American Institute of Aeronautics and Astronautics Inc, AIAA.