乱流境界層中における大規模渦の成長と崩壊

概要

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Streamwise evolution of an artificial large-scale coherent vortex in a turbulent boundary layer was experimentally investigated by measuring velocity and shear stress distributions. The life of the vortex followed three stages; growth, self-preserving, and decay. In the growth stage, the induced velocity and the shear stress confined in the vortex increased rapidly as the scale of the vortex grew larger. The vortex kept its self-similar configuration during the self-preserving stage. The decay rate of the total induced shear stress confined in the vortex was about -1/3, the coherent component of which was still its dominant transporter. In the decay stage, the vortex had a passive structure being more inclined downstream and the decay rate was about -1. The vortex kept the coherency as far as 50δ downstream of its origin.
社団法人日本機械学会の論文
1990-04-25