Turbulent entrainment in high Reynolds number planar wakes, jets and shear free turbulence.

The turbulent/non-turbulent interface (TNTI) is the sharp and highly contorted layer that exists at the edges of jets, wakes, and that separates the turbulent core from the irrotational flow region.

The characteristics of the turbulent/non-turbulent interface (TNTI) are analysed through new high resolution direct numerical simulations (DNS) of shear free turbulence, planar turbulent jets and wakes. Using conditional statistic, performed in relation to the position of the interface, it's possible to highlight the flow features near the interface that otherwise would be masked.

The differences and similarities between the TNTIs of this flows, as well how these affect the dynamics of the nearby quantities will be discussed.