Abstract
The effect of weak stratification on turbulent plane Couette flows is studied by means of direct numerical simulations at the Prandtl number of air. We demonstrate that the stratification tends to reduce the intensity of Couette streamwise streaks in the channel center, eventually breaking the characteristic Couette large-scale rolls. By analyzing the bursting mechanism (i.e. sweeps and ejections) responsible for the vertical momentum transfer, we observe weaker events in a disorganized spatial configuration. This scenario no longer supports the generation of Couette large-scale streaks and rolls in the channel center.
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