AM06-11-019 周期的急拡大管を伝わる2種類の波動(境界層とせん断流・遷移(5),一般講演)

概要

論文の詳細を見る
Bifurcations of flow in a two-dimensional symmetric channel with suddenly expanded sections arranged periodically and its relaxation processes are investigated numerically. Linear stability analysis revealed that the flow is subject to both a symmetry-breaking pitchfork bifurcation leading to a steady deflection and a Hopf bifurcation leading to an oscillation like Tollmien-Schlichting wave. In a resultant flow of the pitchfork bifurcation, we found a flow pattern with twice the period of the channel structure. We observed two kinds of propagating wave in a relaxation process to another bistable steady state, one of which is a fast wave being convected passively and the other a slow wave flipping the flow deflections. It is confirmed that the deflection-flipping wave propagates downstream without decaying due to a self-sustaining mechanism of instability.
日本流体力学会の論文
2006-09-05