The viscous superlayer in turbulent planar jets

Direct numerical simulations of turbulent planar jets are used to study the characteristics of the turbulent/non-turbulent interface (TNTI) separating the turbulent from the irrotational regions of the jet, and to define and visualize the viscous super-layer. Conditional statistics near the TNTI show the existence of a region of a region of ``dominating enstrophy diffusion and negligible enstrophy production,'' outside the TNTI. This is the much debated viscous super-layer. The super layer is not continuos and its thickness is of the order of the Kolmogorov micro-scale.