Analysis of spanwise homogeneous perturbations in laminar hypersonic shock-boundary layer interactions

Saurabh S. Sawant, Ozgur Tumuklu, Vassilis Theofilis, Deborah A. Levin

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


This work investigates the self-excited spanwise homogeneous perturbations arising in a shock-wave/boundary-layer interaction (SWBLI) system formed in a hypersonic flow of molecular nitrogen over a double wedge using the kinetic Direct Simulation Monte Carlo (DSMC) method. The flow has a Knudsen and unit Reynolds numbers of 3.4 × 10−3 and 5.2 × 105 m−1, respectively. Strong thermal nonequilibrium exists downstream of the Mach 7 detached (bow) shock generated due to the upper wedge surface. Global linear instability mechanisms are expected to make the pre-computed 2-D base flow potentially unstable under self-excited, spanwise periodic perturbations. Goertler-type vortices are also expected to form due to curved streamlines in the presence of a strong recirculation region. Our specific intent is to assess the growth rates of unstable modes, the wavelength, location, and the origin of spanwise periodic flow structures, and the characteristic frequencies present in this interaction.

Original languageEnglish (US)
Title of host publicationAIAA Scitech 2020 Forum
PublisherAmerican Institute of Aeronautics and Astronautics Inc, AIAA
Number of pages14
ISBN (Print)9781624105951
StatePublished - 2020
Externally publishedYes
EventAIAA Scitech Forum, 2020 - Orlando, United States
Duration: Jan 6 2020Jan 10 2020

Publication series

NameAIAA Scitech 2020 Forum


ConferenceAIAA Scitech Forum, 2020
Country/TerritoryUnited States

ASJC Scopus subject areas

  • Aerospace Engineering


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