すきま比β=0.14での回転2球間クエット流れの層流-乱流遷移のカオス

概要

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We investigated the laminar-turbulent transition of a spherical Couette flow for clearance ratio β=0.14 at which velocity fluctuation disappears. We found that the root mean square value for V_φ shows complicated evolution for distribution in the radial direction, while the root mean square value for V_∂ shows a relatively simple one, where V_∂ and V_φ are the fluctuating velocity components of the azimuthal and meridian directions, respectively. Calculating the correlation dimension and drawing the Poincare section, it is revealed that the flow field traces a scenario as follows : steady state-> periodic state-> quasi-periodic state-> chaos-> periodic state-> steady state (the disappearance of velocity fluctuation) -> periodic state-> chaos. It is also shown that in the quasi-periodic state, the first return map becomes irreversible as the Reynolds number increases.
社団法人日本機械学会の論文
1997-11-25