回転平面クエット流の乱流域におけるロールセルの実験観測(乱流基礎(6),一般講演)

概要

論文の詳細を見る
This study describes experimental results of stable 2D and 3D roll cells in a fully turbulent plane Couette flow with spanwise system rotation. It is well known that system rotation gives rise to a Coriolis force, which may substantially affect the flow stability and transition as well as the mean flow pattern. Existing studies indicate that when the destabilizing rotation is imposed, a tertiary flow in form of a 3D roll-cell state occurs via transition from a secondary flow (2D roll cell). We have performed experiments for a wide parameter range and observed different flow states. At a high rotation speed, the 3D roll cell is more distinct, whereas at a low speed, the turbulent flow instead contains the stable 2D roll cell. The spanwise wavelength of these structures in turbulent flow resembles that in laminar flow, but the streamwise wavelength is about twice of that in the laminar case.
日本流体力学会の論文
2008-09-04