Numerical investigation of nonlinear entropy-layer instability waves for hypersonic boundary-layers

Andrew B. Hartman, Christoph Hader, Hermann F. Fasel

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

5 Scopus citations


Direct Numerical Simulations (DNS) were carried out to investigate the laminar-turbulent transition for a blunt (right) cone (7 half-angle) at Mach 5.9 and zero angle of attack. First, (linear) stability calculations were carried out employing the same DNS Navier-Stokes solver and using very small disturbance amplitudes in order to capture the linear disturbance development. Contrary to standard Linear Stability Theory results, these investigations revealed a strong “linear” instability in the entropy layer region for a very short downstream distance for oblique disturbance waves with spatial growth rates far exceeding those of second mode disturbances. This linear instability behavior was not captured with conventional LST and/or the Parabolized Stability Equations (PSE) approach. Secondly, a highly-resolved nonlinear breakdown simulation was performed using high-fidelity DNS. The DNS results showed that linearly unstable oblique disturbance waves, when excited with large enough amplitudes, lead to a rapid breakdown and complete laminar-turbulent transition in the entropy layer just downstream of the blunted nose.

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

ASJC Scopus subject areas

  • Nuclear Energy and Engineering
  • Aerospace Engineering
  • Energy Engineering and Power Technology


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