Interaction layer between a turbulent boundary layer and free-stream turbulence

Hearst, Jason, Dogan, Eda and Ganapathisubramani, Bharath (2016) Interaction layer between a turbulent boundary layer and free-stream turbulence. Segalini, Antonia (ed.) In Proceedings of the 5th International Conference on Jets, Wakes and Separated Flows (ICJWSF2015). vol. 185, Springer Cham. pp. 325-332 . (doi:10.1007/978-3-319-30602-5_41).

Record type: Conference or Workshop Item (Paper)

Abstract

The interaction between a turbulent free-stream and a turbulent boundary layer is investigated through particle image velocimetry measurements. An `interaction layer' located between $0.12 \le y/\delta \le 0.19$, at the end of the log layer, is identified whereby the kinetic energy in this layer describes the flow above it. Conditional averages about the interaction layer indicate that it is home to peaks in the Reynolds stresses and that it is the location of a change in the vortical structure. Furthermore, the conditional information identifies that low kinetic energy deficit states in the interaction layer result in a more full boundary layer profile due to increased movement of the bulk flow towards the wall.

Text

hearst_dogan_gana_icjwsf2015_final.pdf - Accepted Manuscript

Available under License University of Southampton Accepted Manuscript Licence.

Download (3MB)