S0505-1-5 圧縮性境界層の遷移構造から発生する音波の研究([S0505-1]乱流遷移(1))

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 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% 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. DNS results show that the forming hairpin vortex is responsible for sound waves emission.
一般社団法人日本機械学会の論文
2010-09-04