Pearce, N. F., Denissenko, Petr and Lockerby, Duncan A. (2013) An experimental study into the effects of streamwise and spanwise acceleration in a turbulent boundary layer. Experiments in Fluids, Volume 54 (Number 1). Article number 1414. doi:10.1007/s00348-012-1414-1

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Abstract

We compare two turbulent boundary layers produced in a low-speed water channel experiment. Both are subjected to an identical streamwise pressure gradient generated via a lateral contraction of the channel, and an additional spanwise pressure gradient is imposed on one of the layers by curving the contraction walls. Despite a relatively high streamwise acceleration, hot-film probe measurements of the mean-velocity distributions show that the Reynolds number increases whilst the coefficient of friction decreases downstream. Visualization of the viscous layers using hydrogen bubbles reveal an increase in the non-dimensional streak spacing in response to the acceleration. Changes in statistical moments of the streamwise velocity near the wall suggest an increased dominance of high-velocity fluctuations. The near-wall streaks and velocity statistics have little sensitivity to the boundary layer three-dimensionality induced by the spanwise pressure gradient, with the boundary-layer crossflow velocity reaching 11 % that of the local freestream velocity.

Item Type:	Journal Article
Divisions:	Faculty of Science > Engineering
Journal or Publication Title:	Experiments in Fluids
Publisher:	Springer
ISSN:	0723-4864
Official Date:	2013
Dates:	Date Event 2013 Published
Volume:	Volume 54
Number:	Number 1
Page Range:	Article number 1414
DOI:	10.1007/s00348-012-1414-1
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access

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