On the Characteristics of Wall Turbulence and Secondary Flow in a Rectangular Open Channel with Small Width to Depth Ratio

Abstract

In order to visualize 3-D turbulent structure of the outer region in an open channel flow, visualization technique using a vertical light sheet and particle tracers is used. Spatial structure of turbulent intensity, two-dimensional divergence and vorticity is obtained. On the basis of computed velocity component of long period, the mechanism of wall turbulence and the spatial structure of secondary flow is discussed.