Abstract: The characteristics of turbulent/non-turbulent interfaces and turbulent/turbulent interfaces (TNTI and TTI) are analysed by new carefully designed direct numerical simulations (DNS). Whereas TNTIs separate the turbulent from the non-turbulent region in free shear flows and turbulent boundary layers, TTIs appear whenever two regions of dis- tinct turbulent characteristics interact such as in turbulent jets and wakes surrounded by external turbulent flow, or strongly perturbed turbulent boundary layers, i.e., when the external flow is in turbulent condition. Direct numerical simulations (DNS) of temporally evolving and spatially evolving TTIs are carried out to analyse the conditional mean profiles of enstrophy. Preliminary results suggest that, if properly normalised using the mean local Kolmogorov velocity and length scale, these conditional mean profiles are universal. 

Curriculum Vitae: Carlos B. da Silva graduated in Mechanical Engineering at Instituto Superior Técnico (IST), then part of the Technical University of Lisbon (now University of Lisbon UL) in 1996 and after this worked in CFD development/simulations in several Industrial and European research projects. In 1998 he moved to the Laboratoire des Écoulements Géophysiques et Industriels (LEGI) in Grenoble (France), attached to the Institut polytechnique de Grenoble (now Grenoble Institute of Technology), where he defended his Doctoral thesis in grid/subgrid-scale interactions in jets (2001). After several post-doctoral and researcher appointments in Grenoble, Porto and Lisbon, he became permanent staff Instituto Superior Técnico/University of Lisbon in 2009, where he is now Full Professor in Fluid Mechanics at the Department of Mechanical Engineering. His research interests include, among other topics, i) the physics of turbulence, ii) turbulent entrainment and, iii) turbulence in complex and non-Newtonian fluids.