Abstract
The turbulent burst under a sheared air-water interface was experimentally investigated using hydrogen bubble visualization technique. The surface shear was imposed by an airflow over the water flow which was kept free from surface waves. Results show that the wind shear has the main influence on the bursting events. At relatively high shear rates, the flow near the interface is dominated primarily by intermittent bursting events. The general features of bursting processes are described in some detail. The observed bursting events show qualitative similarities with those occurring in near-wall turbulence. However, a few distinctive phenomena were also observed, including the existence of vertical vortices and thickening process of the boundary layer, which appear to be associated with the characteristics of air-water interface.
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