壁面乱流の壁近傍領域の擬縦渦構造と構造論的モデリング

概要

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Coherant fluid motions near the wall in a fully-developed two-dimensional turbulent channel flow have been visualized by using a sophisticated hydrogen-bubble techique with partially insulatied fine tungsten wires, which generate segmental hydrogen-bubbles, at several distances from the wall. These flow visualizations supply not only a direct evidence for the existence of streamwise vortical motions but quantitative data of fluid motions in the wall region. Further data reduction produces instantaneous distributions of two velocity components of v and w as well as streamwise vorticity of ω_x in the y - z plane perpendicular to the flow direction. The instantaneous contours of streamwise vorticity thus obtained show pseudo-periodicity in the spanwise direction and also double-layer structure in the direction normal to the wall. The compatibility of the pseudo-vortical structure with what is known about the near-wall turbulence is tested and confirmed by a simple structural model based upon unsteady spanwise-periodic secondary motions.
社団法人日本機械学会の論文
1985-07-25