Utilizing a turbulent channel flow facility, experiments were performed to determine the modifications made to the temporal and spatial structure of turbulence over a sinusoidally rough surface due to momentum injection through the surface. As expected, when compared to the smooth-walled conditions, it was found that the surface roughness increased wall shear stress, decreased the turbulence energy content near the wall, and shifted that energy content to wavelengths on the order of the roughness elements. The addition of momentum injection was found to produce further modifications analogous to increasing the roughness height by increasing the wall shear stress and further reducing the energy content of the near-wall turbulence while simultaneously shifting it to longer wavelengths.

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Conference Proceeding

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Notes/Citation Information

Published in the Proceedings of the 51st AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition, Paper 2013-0534, p. 1-10.

Copyright © 2013 by Sean Bailey.

The copyright holder has granted the permission for posting the article here.

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