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The turbulent/non-turbulent interface and viscous superlayer in turbulent planar jets

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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.

Author(s):

Carlos B. da Silva    
IST/Technical University of Lisbon
Portugal

Rodrigo R. Taveira    
IST/Technical University of Lisbon
Portugal