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An experimental study into the effects of streamwise and spanwise acceleration in a turbulent boundary layer

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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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Official URL: http://dx.doi.org/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 and Medicine > Engineering > Engineering
Journal or Publication Title: Experiments in Fluids
Publisher: Springer
ISSN: 0723-4864
Official Date: 2013
Dates:
DateEvent
2013Published
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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