回転系における渦崩壊の数値解析 [in Japanese] Numerical calculation on Vortex Breakdown in Rotating System [in Japanese]
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Numerical study on vortex breakdown in a rotating cylindrical container is presented Flow depend on Rossby number R ?? =|Ω<SUB> b</SUB>-Ω|/2Ω, Ekman number Ek=ν/(2ΩR<SUP> 2</SUP> ) and aspect ratio of the container H/R, here ν was kinematic viscosity of working fluid, Ω and Ω<SUB> b</SUB> respectively angular velocities of the container and a rotating endwall, H fluid depth, and R a radius of the rotating disk. Calculations were carried out for H/R=2.5, Reynolds number Re=Ro/Ek=2126, EK=5.00×10<SUP> -12</SUP>-2.00×10<SUP> -1</SUP>. Despite rotation of a container was very slow compared to a rotating endwall, flow was quite different from the case without rotation of the container. In rotating frame, rotating endwall and a container rotate in a opposite direction, breakdown bubbles are moved to downstream. They rotate in a same direction, bubbles are moved to upstream.
- Transactions of Visualization Society of Japan
Transactions of Visualization Society of Japan 17, 289-292, 1997-07-01
The Visualization Society of Japan