Measurements of the Effects of Streamwise Riblets on the Turbulence Structures in Boundary Layers
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This study presents experimental results on the effects of streamwise-oriented riblets on the coherent structures of turbulence. The riblet spacings correspond to 0.5 and 1.5 times the natural spacing of the low-speed streaks. The cross-sectional dimensions of the riblets were chosen to promote more effective control on the development and spatial distribution of wave packets consisting of hairpin vortices. Of the two riblet spacings considered, the wider spacing demonstrated effective control on the spanwise positioning of the wave packets, enabling reduction in their mutual interaction and realizing a reduction in their spanwise density compared to the conditions on a smooth surface. The closer-spaced riblets were observed to have even more control on the spanwise positioning of the wave packets, and produced notably stronger sweep and ejection events while promoting mutual interaction of hairpin vortices in spanwise-adjacent wave packets via spanwise-oriented vortical structures created by a Kelvin-Helmholtz instability mechanism.
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Copyright © 2016 the author(s). Theses may be used for non-commercial research, educational, or related academic purposes only. Such uses include personal study, research, scholarship, and teaching. Theses may only be shared by linking to Carleton University Institutional Repository and no part may be used without proper attribution to the author. No part may be used for commercial purposes directly or indirectly via a for-profit platform; no adaptation or derivative works are permitted without consent from the copyright owner.
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- 2016
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