Interfaces of uniform momentum zones in turbulent boundary layers
Charitha M de Silva, Jimmy Philip, Nicholas Hutchins, Ivan Marusic
JOURNAL OF FLUID MECHANICS | CAMBRIDGE UNIV PRESS | Published : 2017
In this paper we examine the characteristics of the interfaces that demarcate regions of relatively uniform streamwise momentum in turbulent boundary layers. The analysis utilises particle image velocimetry databases that span more than an order of magnitude of friction Reynolds number (Reτ = 103-104), enabling us to provide a detailed description of the interfacial layers as a function of Reynolds number. As reported by Adrian et al. (J. Fluid Mech., vol. 422, 2000, pp. 1-54), these interfaces appear as persistent regions of strong shear with distinct patches of vorticity consistent with a packet-like structure. Here, however, we treat these interfaces as continuous lines, thus averaging th..View full abstract
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The authors gratefully acknowledge the financial support of the Australian Research Council.