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

Abstract

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
DOIs
StatePublished - 2020
EventAIAA AVIATION 2020 FORUM - Virtual, Online
Duration: Jun 15 2020Jun 19 2020

Publication series

NameAIAA AVIATION 2020 FORUM
Volume1 PartF

Conference

ConferenceAIAA AVIATION 2020 FORUM
CityVirtual, Online
Period6/15/206/19/20

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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