二乱流斑点の融合による内部渦の相互干渉 : 流体工学,流体機械

概要

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A pair of turbulent spots was simultaneously generated in a zero pressure-gradient laminar boundary layer on a flat plate. Multi-hotwire measurements were conducted to obtain instantaneous configurations of the turbulent spots throughout their merging process. The spot is composed of a number of hairpin-like vortices. At each wingtip of the spot, an isolated longitudinal vortex induced an upwash which conformed a velocity defect region above it. As the two simultaneously generated spots grew downstream, they began to merge at their inside wingtips. Mutual interaction between the longitudinal vortices at the Inside wingtips enhanced the velocity defect above the merged region, where the resultant unstable velocity inflection gave birth to stronger spanwise vortices with the longitudinal vortices beneath. These spanwise vortices developed into large-scale horseshoe vortices in the transitional boundary layer.
社団法人日本機械学会の論文
2001-09-25