チャネル流における局在斜め乱流構造の維持機構

抄録

An isolated turbulent oblique band is investigated at a low bulk Reynolds number Re_m = 440 in plane channel flow with a very large numerical domain. The downstream edge of the band propagates in the streamwise and spanwise directions to quasi-periodically generates disturbances which will be left behind to decay in time. Long time integration shows that the band keeps roughly constant length in time without continuously shrinking, extending or splitting, suggesting the presence of an isolated equilibrium turbulent band.