E114 角柱を過ぎる流れの不安定性

概要

論文の詳細を見る
Instability and transition of flow past two square bars which are placed perpendicularly to the flow direction in a uniform flow are investigated numerically, experimentally and theoretically on the assumption of two-dimensional and incompressible flow field. It is known that the flow is steady and symmetric along the streamwise centerline through the middle of the two bars at small Reynolds numbers, but becomes unstable and oscillatory at a critical Reynolds number. An exchange of two different instability modes is confirmed as the distance ratio between the square bars changes, which has been observed in experiments by vortices being alternately or simultaneously detached from the two rear corners of the two squre bars. The origin of the exchange of instability modes is found by the linear stability analysis.
日本流体力学会の論文
2001-07-31