Direct Numerical Simulations (DNS) of Natural Transition in High-Speed Boundary Layers Using a Broadband Random Forcing Approach

Christoph Hader, Hermann F. Fasel

Research output: Chapter in Book/Report/Conference proceedingChapter

Abstract

A direct numerical simulation (DNS) was carried out for which random pressure fluctuations were forced at the inflow of the computational domain to initiate the laminar-turbulent transition process. The random forcing generated a broad spectrum of disturbances with respect to both frequency and azimuthal wavenumbers without any bias towards any of the known relevant nonlinear mechanisms (fundamental, subharmonic, oblique). The DNS results showed clear evidence that fundamental resonance is the dominant nonlinear mechanism. The time-averaged Stanton number contours indicated the formation of a pattern of streamwise “hot” streaks on the surface of the cone. Such hot streak patterns have previously been observed in experiments in the BAM6QT and in “controlled” breakdown DNS for flared and straight cones.

Original languageEnglish (US)
Title of host publicationIUTAM Bookseries
PublisherSpringer Science and Business Media B.V.
Pages565-574
Number of pages10
DOIs
StatePublished - 2022

Publication series

NameIUTAM Bookseries
Volume38
ISSN (Print)1875-3507
ISSN (Electronic)1875-3493

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Automotive Engineering
  • Materials Science(all)
  • Aerospace Engineering
  • Acoustics and Ultrasonics
  • Mechanics of Materials
  • Mechanical Engineering

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