S0506-3-6 平行平板間クエット乱流中における大規模ストリーク空間構造の解明([0506-3]乱流における運動量,熱,物質の輸送現象(3))
詳細
In turbulent Couette flows, there exists a large-scale streamwise vortical structure of which width is of the ordre of the channel height 2h. The vortical structure affects the streamwise velocity fluctuation. In this study, 32-channel I-type probe, which covers 6h in the spanwise direction, is used to examine the fluctuation of large-scale streak. Fluctuation of the large-scale streak in shorter period (5-10h) than those of which periodic lenth is 40-60h is identified. This fluctuation is closely related to the self-sustaing process found in minimal Couette flow simulation.
