E122 空間発展DNSによる圧縮性境界層の遷移機構の研究(E-12 遷移と不安定性(2),一般講演)

概要

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Spatial direct numerical simulations are used 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 two-dimensional unstable T-S wave are superimposed on the laminar profile at the inlet plane of the boundary layer computational box. The magnitudes of the disturbances are chosen to be 1% or 0.5% of the freestream value. Oblique modes with the TS wave produces peak-valley splitting downstream and later hairpin vortices (hairpin packet) on the low speed streak are observed. So-called subharmonic transition appears downstream in the boundary layer. In this study, the details of these three-dimensional structures are depend on the magnitude of the disturbance.
2004-08-09