Input-output analysis for görtler-type instability in axisymmetric hypersonic boundary-layers

Anubhav Dwivedi, G. S. Sidharth, Charles Hollender, Graham V. Candler

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


We study the growth of azimuthally-periodic perturbations in the boundary-layer on axisymmetric geometries with concave flare using an input-output analysis. The global linear system is constructed using an unstructured finite-volume discretization of the compressible Navier-Stokes equations linearized in conserved variables. The global input-output analysis of the flared geometries identifies the most amplified steady perturbations downstream as azimuthally-periodic streaks caused due to local centrifugal (Görtler-type) instability. Analysis of perturbations with different azimuthal wavenumbers shows that the flow selectively amplifies a range of wavenumbers. Predictions from the I/O analysis are compared with data from direct numerical simulations.

Original languageEnglish (US)
Title of host publicationAIAA AVIATION 2020 FORUM
PublisherAmerican Institute of Aeronautics and Astronautics Inc, AIAA
ISBN (Print)9781624105982
StatePublished - 2020
EventAIAA AVIATION 2020 FORUM - Virtual, Online
Duration: Jun 15 2020Jun 19 2020

Publication series

Volume1 PartF


CityVirtual, Online

Bibliographical note

Funding Information:
This work was sponsored by the Office of Naval Research under grant number N00014-19-2037 and Air Force Office of Scientific Research (AFSOR) through grant number FA9550-17-1-0250. The views and conclusions contained herein are those of the authors and should not be interpreted as necessarily representing the official policies or endorsements,

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