Abstract
A mixing shear flow is formed by bringing together two streams of water, moving at different velocities in a channel. The vortical structures are generated in the mixing flow and transported downstream. The simultaneous data on the two components of velocity, density fluctuation at almost one point were obtained together with the data on the displacement of assumed interface between the upper layer and the lower layer. Taking ensemble averages on various turbulent quantities e. g. turbulence, density fluctuation, Reynolds stress, turbulent flux, … based on the displacement of assumed interface, not only the spatial structures of various quantities accompanied by the vortices but also their temporal changes in spatial structures were obtained without using the assumption of Taylor's frozen turbulence. It is apparent from these spatial-temporal structures that the large vortex plays important roles on momentum and mass transport, production of turbulence, entrainment in a mixing shear flow.
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