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Evidence of rare backflow and skin-friction critical points in near-wall turbulence using micropillar imaging

Brücker, C. (2015). Evidence of rare backflow and skin-friction critical points in near-wall turbulence using micropillar imaging. Physics of Fluids, 27(031705), doi: 10.1063/1.4916768

Abstract

© 2015 AIP Publishing LLC. The recent discovery of rare backflow events in turbulent boundary layer flows based on the analysis of simulation data has again raised the need of experimental visualizations of wall-shear stress fields in unsteady flows. The localization of critical points, which are thought to strongly correlate with large-scale events in the log-layer, is of importance. Up to now, there is no experimental proof of these rare events and their topological patterns. Their existence in a turbulent boundary-layer flow along a flat plate is shown herein by means of imaging with 2D arrays of flexible micropillars attached at the wall.

Publication Type: Article
Additional Information: Copyright 2015 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in Brücker, C. (2015). Evidence of rare backflow and skin-friction critical points in near-wall turbulence using micropillar imaging. Physics of Fluids, 27(031705), doi: 10.1063/1.4916768 and may be found at dx.doi.org/10.1063/1.4916768.
Subjects: T Technology
Departments: School of Mathematics, Computer Science & Engineering
Related URLs:
URI: http://openaccess.city.ac.uk/id/eprint/12940
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