AM06-11-010 DNSによる圧縮性円筒境界層における乱流遷移構造の研究(境界層とせん断流・遷移(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 and the resultant sound emission mechanism in a compressible boundary layer, for a high-speed train model, where the free stream velocity of 500Km/h, corresponding Mach number is 0.41. The Reynolds number at the inlet based on the displacement thickness is 1640, which meets the boundary layer of model measurements undergoing transition. Random disturbances waves of compressible isotropic turbulence are superimposed on the laminar profile at the inlet plane of the boundary layer computational box. The magnitude of random disturbance is 3% of the free stream velocity. Simulation results show that there are two different types of waves. First one is the wave that has a wide spectrum in the near wall region. Second one is the wave that has a discrete spectral. The wave of "discrete" spectral decreases gradually with the increase of frequency.
日本流体力学会の論文
2006-09-05