Johannes von Lindheim, Technische Universität Berlin
"What is... a coherent structure?"
Although a formal definition of a coherent (or turbulent) structure has so far been elusive, it is generally thought to be a region of space and time within which the flow field exhibits a characteristic coherent pattern. With the contribution from flow visualization experiments and DNS simulations, Pope (2001) classifies these structures into eight categories. In this talk, I will give a brief overview on turbulent structures and then shift the focus to identifying one category of such structures, namely vortices, both in the Eulerian and Lagrangian specification of the flow field.