Downstream evolution of perturbations in a zero pressure gradient turbulent boundary layer
File(s)
Author(s)
Bruce, PJK
Buxton, ORH
Rodriguez-Lopez, E
Type
Journal Article
Abstract
This paper examines the evolution of perturbations generated by various trips in a zero pressure gradient turbulent boundary layer. Measurements taken using hot-wire anemometry show that the evolution of the boundary layer towards the natural state is strongly dependent on the trip geometry. In particular the mechanisms creating the boundary layer appear to depend primarily on the wall normal distribution of blockage ratio, recovering the natural properties more rapidly for a uniform distribution of blockage (wall normal cylinders) than for non-uniform blockage (sawtooth fence). The relative size of the trip with respect to the boundary layer is shown to be a second order effect. Standard behaviour (characterized by the skin friction coefficient, CfCf, the wake component, ΠΠ, and the shape factor, H) is recovered successfully 500D∼75h500D∼75h downstream, presenting 175%175% higher momentum thickness, θθ, than the natural case for the same downstream distance.
Date Issued
2016-03-03
Date Acceptance
2015-04-20
Citation
Progress in Turbulence VI: Proceedings of the iTi Conference on Turbulence 2014, 2016, 165, pp.133-137
ISSN
0930-8989
Publisher
Springer
Start Page
133
End Page
137
Journal / Book Title
Progress in Turbulence VI: Proceedings of the iTi Conference on Turbulence 2014
Volume
165
Copyright Statement
The final publication is available at Springer via http://dx.doi.org/10.1007/978-3-319-29130-7_24
Sponsor
Commission of the European Communities
Grant Number
FP7 - 317269
Publication Status
Published