On the effect of discrete roughness on the growth of crossflow instability in very low turbulence environment

Marco Placidi, Evelien van Bokhorst, Chris J. Atkin

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)


Wind tunnel experiments were conducted in a low-turbulence environment (Tu < 0.006%) on the stability of 3D boundary layers. The effect of two different distributions of discrete roughness elements (DREs) on crossflow vortices disturbances and their growth was evaluated. As previously reported, DREs are found to be an effective tool in modulating the behaviour of crossflow modes. However, the effect of 24µm DREs was found to be weaker than previously thought, possibly due to the low level of environmental disturbances herewith. Preliminary results suggest that together with the height of the DREs and their spanwise spacing, their physical distribution across the surface also intimately affects the stability of 3D boundary layers. Finally, crossflow vortices are tracked along the chord of the model and their merging is captured. This phenomena is accompanied by a change in the critical wavelength of the dominant mode.

Original languageEnglish
Title of host publication8th AIAA Flow Control Conference
PublisherAmerican Institute of Aeronautics and Astronautics Inc. (AIAA)
ISBN (Print)9781624104329
Publication statusPublished - 2016
Event8th AIAA Flow Control Conference, 2016 - Washington, United States
Duration: 13 Jun 201617 Jun 2016

Publication series

Name8th AIAA Flow Control Conference


Conference8th AIAA Flow Control Conference, 2016
Country/TerritoryUnited States

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