Visualization and Tracking of Vortices and Shear Layers in the Late Stages of Boundary-Layer Laminar-Turbulent Transition

The purpose of this contribution is to present some examples for the use of recent data processing and visualization techniques for the study of unsteady vortical flows. The basic idea is to extract vortices, shear layers and data defining their current state from DNS data and to track their evolution in time. Some apparent signatures which help to get additional insight into the flow dynamics have been identified. They demonstrate the promising features of the technique, albeit further studies are necessary to complete this work.