地面に近接して回転する円筒まわりの流れ:第5報, 流体力のヒステリシスな現象と差分法による数値解析

概要

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The flow around rotating circular cylinder that is close to a moving plate has been investigated numerically and experimentally for the high Reynolds number(Re=3.3×10^4〜5×10^4). Two different flow patterns were observed under the same conditions changing peripheral velocity of the circular cylinder. The transition of the flow pattern occurs when the jet through a small gap(H/D=0.1)switches from the moving plate to the cylinder wall. This phenomenon is known as some kind of the Coanda effect. Furthermore the Coanda effect was accompanied by hysteretic effect. Computation of the two-dimensional unsteady Navier-Stokes equations was also conducted, The numerical results qualitatively agreed with the experimental ones. It was founs that the Coanda effect and the hysteretic phenomenon were greatly related to the standing vortex that exists behind the cylinder.
一般社団法人日本機械学会の論文
2000-01-25