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Cross-stream stereoscopic particle image velocimetry of a modified turbulent boundary layer over directional surface pattern

Published online by Cambridge University Press:  23 January 2017

Kevin Kevin ,
J. P. Monty ,
H. L. Bai ,
G. Pathikonda ,
B. Nugroho ,
J. M. Barros ,
K. T. Christensen  and
N. Hutchins
Kevin Kevin*
Affiliation:
Department of Mechanical Engineering, University of Melbourne, Parkville, Victoria 3010, Australia
J. P. Monty
Affiliation:
Department of Mechanical Engineering, University of Melbourne, Parkville, Victoria 3010, Australia
H. L. Bai
Affiliation:
Department of Mechanical Engineering, University of Melbourne, Parkville, Victoria 3010, Australia Department of Civil and Environmental Engineering, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong
G. Pathikonda
Affiliation:
Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA Department of Aerospace and Mechanical Engineering, University of Notre Dame, Notre Dame, IN 46556, USA
B. Nugroho
Affiliation:
Department of Mechanical Engineering, University of Melbourne, Parkville, Victoria 3010, Australia
J. M. Barros
Affiliation:
Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA Department of Mechanical Engineering, United States Naval Academy, Annapolis, MD 21402, USA
K. T. Christensen
Affiliation:
Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA Department of Aerospace and Mechanical Engineering, University of Notre Dame, Notre Dame, IN 46556, USA International Institute for Carbon Neutral Energy Research (WPI-I2CNER), Kyushu University, Fukuoka 819-0395, Japan
N. Hutchins
Affiliation:
Department of Mechanical Engineering, University of Melbourne, Parkville, Victoria 3010, Australia
*
†Email address for correspondence: kevin.kevin@unimelb.edu.au
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Abstract

A turbulent boundary layer developed over a herringbone patterned riblet surface is investigated using stereoscopic particle image velocimetry in the cross-stream plane at $Re_{\unicode[STIX]{x1D70F}}\approx 3900$ . The three velocity components resulting from this experiment reveal a pronounced spanwise periodicity in all single-point velocity statistics. Consistent with previous hot-wire studies over similar-type riblets, we observe a weak time-average secondary flow in the form of $\unicode[STIX]{x1D6FF}$ -filling streamwise vortices. The observed differences in the surface and secondary flow characteristics, compared to other heterogeneous-roughness studies, may suggest that different mechanisms are responsible for the flow modifications in this case. Observations of instantaneous velocity fields reveal modified and rearranged turbulence structures. The instantaneous snapshots also suggest that the time-average secondary flow may be an artefact arising from superpositions of much stronger instantaneous turbulent events enhanced by the surface texture. In addition, the observed instantaneous secondary motions seem to have promoted a free-stream-engulfing behaviour in the outer layer, which would indicate an increase turbulent/non-turbulent flow mixing. It is overall demonstrated that the presence of large-scale directionality in transitional surface roughness can cause a modification throughout the entire boundary layer, even when the roughness height is 0.5 % of the layer thickness.

JFM classification

Boundary Layers: Boundary layer structure Turbulent Flows: Turbulence control Turbulent Flows: Turbulent boundary layers

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Papers
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Journal of Fluid Mechanics , Volume 813 , 25 February 2017 , pp. 412 - 435
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© 2017 Cambridge University Press 

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