負浮力によるカルマン渦列の発達過程とその特異性

概要

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Precise streaklines obtained by numerical calculation of the laminar, time-dependent continuity, Navier-Stokes and energy equations in an opposing flow of air show that the vortex scale increases, the vortex spiral is activated, and the wake frequency decreases, with an increase in the Richardson number Ri at the given Reynolds number Re. The increase of the vortex scale in an opposing wake was also shown by the present smoke-wire experiment. Thus the isothermal Karman vortex street develops due to negative buoyancy, and the developed Karman vortex street occurs in the wide range of Ri. These are resulted in the generation of wake vorticity due to negative buoyancy. The vortex street developed at the given Re and Ri never occurs in an isothermal wake, a wake with negative buoyancy at a low Re, and a wake developed at other Re and Ri.
一般社団法人日本機械学会の論文
1998-08-25