Lifetimes of flow topology in a turbulent boundary layer

Abstract

This study involves an experimental investigation of the local flow topology dynamics in the logarithmic and outer region of a turbulent boundary layer. In particular, we wish to establish characteristic life-times for the energy containing eddies and possibly relate those to the coherent structures commonly observed in boundary layers. So far the instantaneous spatial organization of these eddies has received important attention, leaving, however, open questions regarding the dynamics and time-scales of these eddies.