軸対称形うず流崩壊におけるうず塊の形成過程とその構造 : 第2報,N-S方程式に基づく数値解析

概要

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In the preceding report, the authors proposed a theoretical model based on the inviscid linear theory, which explains the growing process of the axisymmetric type vortex breakdown, namely the process of birth and growth of a bubble in the swirling pipe flow. The present work describes the numerical analysis of the vortex breakdown (axisymmetric). The Navier-Stokes equations are solved in the range of Reynolds number R_e = 100 ~300, under the boundary condition of pipe entrance that the swirling velocity is varied abruptly. The aspect of streamlines and streaklines in time sequence clearly shoed the growing process of the bubble. And it is clarified that results from the inviscid theory mentioned above are in qualitative agreement with those of this work. Further, the occurring condition of the vortex breakdown and the axial position of the bubble in the pipe were also discussed using numerical solutions for various entrance boundary conditions.
一般社団法人日本機械学会の論文
1986-08-25