Study of transition mechanism in a compressible boundary layer forced with TS and a pair of stable oblique waves

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Bibliographic Information

Other Title
  • ＴＳ波と斜行波によって励起された圧縮性境界層の遷移機構に関する研究
Published
2005
DOI
  • 10.11426/nagare1982.24.543
Publisher
The Japan Society of Fluid Mechanics

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Description

Spatial direct numerical simulations are performed to study the formation and development of three-dimensional structures in a compressible flat plate boundary layer, where the freestream Mach number is 0.5 and the Reynolds number at the inlet based on the displacement thickness 1000. A pair of neutral/stable oblique modes and a TS wave are superimposed on the laminar profile at the inlet plane of the boundary layer computational box. The magnitudes of the TS and oblique waves are chosen to be 1% of the freestream velocity, respectively. After saturation of the T-S wave, the growth of the oblique modes produces peak-valley splitting downstream and hairpin vortices (hairpin packets) on the low speed streak are observed further downstream. The oblique subharmonic mode leads to sooner transition to turbulence downstream in the boundary layer. Numerical results show the evolution of hairpin vortices into a large-scale structure, in which fine-scale vortical structures with low-/high-speed streaks develop near the wall.

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Details 詳細情報について

  • CRID
    1390282679671403264
  • NII Article ID
    130003817987
  • DOI
    10.11426/nagare1982.24.543
  • ISSN
    21854912
    02863154
  • Text Lang
    ja
  • Data Source
    • JaLC
    • CiNii Articles
  • Abstract License Flag
    Disallowed

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