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Session: Wall-bounded flows 6
Session starts: Friday 28 August, 10:30
Presentation starts: 11:15
Room: Room B

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Christoph Bruecker (Institute of Mechanics and Fluid Dynamics, TU Freiberg, Germany)

Abstract:
The recent discovery of rare backflow events in turbulent boundary layer flows based on the analysis of DNS data has raised again the need of experimental visualizations of wall-shear stress (WSS) fields in such unsteady flows. Of importance is the localization of critical points which are thought to strongly correlate with large-scale events in the log-layer. Up to now there is no experimental prove of these rare events and their topological patterns in the skin-friction field. Their existence in a turbulent boundary-layer flow is shown herein by means of imaging with 2D arrays of flexible micropillars attached at the wall.