AM05-04-002 回転2円板間流れの遷移とパターン形成(境界層とせん断流1,一般講演)

概要

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Pattern formation in flow between two corotating disks in an enclosure is investigated numerically and experimentally. The outer cylindrical boundary of the flow field is assumed to be fixed, whereas the inner cylinder rotates together with the two disks. The axisymmetry of the flow field is broken due to instability at high Reynolds numbers. Such instability occurs for small gap ratios, the ratio of the gap between two disks to the radius of the annulus, and yields a polygonal flow pattern in the plane normal to the rotation axis. We identified two kinds of three dimensional unsteady flow by numerical simulations, one of which is asymmetric with respect to the inter-disk midplane and the other has a shift-and-reflect symmetry with the midplane, and compared them with those obtained by experiment. We found that the critical Reynolds number at which the axisymmetric makes a transition to unsteady 3D flow is smaller than those evaluated in previous papers, although the flow patterns are the same with those reported in them.
日本流体力学会の論文
2005-09-05