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Wall-shear stress patterns of coherent structures in turbulent duct flow

Published online by Cambridge University Press:  25 August 2009

SEBASTIAN GROSSE  and
WOLFGANG SCHRÖDER
SEBASTIAN GROSSE*
Affiliation:
Institute of Aerodynamics, RWTH Aachen University, D-52062 Aachen, Germany Laboratory for Aero and Hydrodynamics, Delft University of Technology, 2628 CA Delft, The Netherlands
WOLFGANG SCHRÖDER
Affiliation:
Institute of Aerodynamics, RWTH Aachen University, D-52062 Aachen, Germany
*
†Email address for correspondence: sebastian.grosse@rwth-aachen.de
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Abstract

The wall-shear stress distribution in turbulent duct flow has been assessed using the micro-pillar shear-stress sensor MPS3. The spatial resolution of the sensor line is 10.8l+ (viscous units) and the total field of view of 120l+ along the spanwise direction allows to capture characteristic dimensions of the wall-shear stress distribution at sufficiently high resolution. The results show the coexistence of low-shear and high-shear regions representing ‘footprints’ of near-wall coherent structures. The regions of low shear resemble long meandering bands locally interrupted by areas of higher shear stress. Conditional averages of the flow field indicate the existence of nearly streamwise counter-rotating vortices aligned in the streamwise direction. The results further show periods of very strong spanwise wall-shear stress to be related to the occurrence of high streamwise shear regions and momentum transfer towards the wall. These events go along with a spanwise oscillation and a meandering of the low-shear regions.

Type
Papers
Information
Journal of Fluid Mechanics , Volume 633 , 25 August 2009 , pp. 147 - 158
Copyright
Copyright © Cambridge University Press 2009

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