Direct Numerical Simulations of laminar-turbulent boundary-layer transition for blunt cones at Mach 6: Effect of Varying Nose Bluntness

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

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

1 Scopus citations

Abstract

Direct Numerical Simulations (DNS) were carried out to investigate laminar-turbulent boundary-layer transition for a straight cone (7 half-angle) with varying nose radii at Mach 6 and zero angle of attack. First, a conventional Linear Stability Theory (LST) solver was used in order to determine the critical Reynolds number for amplification of second mode disturbances for each of the cases considered here. Next, (linear) stability calculations were carried out by employing a high-order 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). Nonlinear breakdown simulations were performed using high-fidelity DNS for three different cases. The DNS results showed that linearly unstable oblique disturbance waves, when excited with large enough amplitudes, lead to a rapid breakdown and the onset of laminar-turbulent transition in the entropy layer just upstream of the second-mode instability region.

Original languageEnglish (US)
Title of host publicationAIAA Aviation and Aeronautics Forum and Exposition, AIAA AVIATION Forum 2021
PublisherAmerican Institute of Aeronautics and Astronautics Inc, AIAA
ISBN (Print)9781624106101
DOIs
StatePublished - 2021
Externally publishedYes
EventAIAA Aviation and Aeronautics Forum and Exposition, AIAA AVIATION Forum 2021 - Virtual, Online
Duration: Aug 2 2021Aug 6 2021

Publication series

NameAIAA Aviation and Aeronautics Forum and Exposition, AIAA AVIATION Forum 2021

Conference

ConferenceAIAA Aviation and Aeronautics Forum and Exposition, AIAA AVIATION Forum 2021
CityVirtual, Online
Period8/2/218/6/21

ASJC Scopus subject areas

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

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