円筒境界層における低周波圧力変動に及ぼす流入攪乱の影響(安定性(3),一般講演)

概要

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Spatial direct numerical simulations and linear stability analyses are used to study the development of turbulent structures and the resultant sound emission mechanism in a compressible boundary layer, for a high-speed train model conducted in a moving model facility, where the free stream velocity is 500Km/h (corresponding Mach number is 0.41). Disturbances of compressible isotropic turbulence are superimposed on the laminar profile at the inlet boundary layer in the computational box. The Reynolds number at the inlet based on the displacement thickness is 1640, which meets the measurement of the boundary layer undergoing transition. Simulation results show that the inlet disturbances affect the transition and the low-frequency velocity/pressure fluctuations generated from the groups of eddies growing to the edge of a subsonic cylindrical boundary layer.
日本流体力学会の論文
2010-09-09