The turbulent/nonturbulent interface in boundary layers
  This video shows three-dimensional contours at two different values of enstrophy for a turbulent boundary layer up to $Re_\theta \simeq 2500$. Its intention is to show how, what can be be considered the turbulent/nonturbulent interface for a turbulent boundary layer, evolves in time. Keyword: fluid dynamics video 
Guillem Borrell, Juan A. Sillero and Javier Jim\'enez
physics.flu-dyn