Direct numerical simulations of hypersonic boundary-layer transition for a straight cone at mach 5

Christoph Hader, Ning Deng, Hermann F. Fasel

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

Abstract

Direct Numerical Simulations (DNS) were carried out in order to investigate laminar-turbulent boundary-layer transition for a sharp 7 half-angle straight (right) cone with a sharp nose tip at Mach 5 and zero angle of attack. The cone geometry and flow conditions of the experiments in the Hypersonic Wind Tunnel 5 (HWT-5) at Sandia National Laboratories were used for the numerical investigations. Results of three-dimensional pulse simulations indicate that a so-called fundamental and a so-called “oblique breakdown” scenario are possible relevant nonlinear transition mechanisms for the investigated geometry and flow conditions. In addition to the “classical” breakdown scenarios the wave packet simulations also revealed the possibility of first and second mode interactions. Highly-resolved “controlled” breakdown simulations of a fundamental breakdown, an oblique breakdown and a breakdown initiated by an axisymmetric second mode with a pair of oblique first mode disturbances confirm that any of these nonlinear mechanisms can lead to transition. The DNS results indicate that the oblique breakdown and the combined first mode, second mode interaction breakdown lead to transition more rapidly (in a shorter downstream distance) compared to the fundamental breakdown.

Original languageEnglish (US)
Title of host publicationAIAA Scitech 2021 Forum
PublisherAmerican Institute of Aeronautics and Astronautics Inc, AIAA
Pages1-22
Number of pages22
ISBN (Print)9781624106095
StatePublished - 2021
EventAIAA Science and Technology Forum and Exposition, AIAA SciTech Forum 2021 - Virtual, Online
Duration: Jan 11 2021Jan 15 2021

Publication series

NameAIAA Scitech 2021 Forum

Conference

ConferenceAIAA Science and Technology Forum and Exposition, AIAA SciTech Forum 2021
CityVirtual, Online
Period1/11/211/15/21

ASJC Scopus subject areas

  • Aerospace Engineering

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