Conference Proceedings

Regions of uniform streamwise momentum in turbulent boundary layers

CM de Silva, I MARUSIC, N Hutchins

Australasian Fluid Mechanics Society (AFMS) | Published : 2014

Abstract

This study investigates the presence of zones of uniform stream-wise momentum (or UMZs) across a range of Reynolds numbers in turbulent boundary layers, spanning more than an order of magnitude (Reτ ≈ 103 - 104). A rigorous examination of the identification criteria suggested by Adrian et al. [1] is presented, and then employed to show that a zonal-like structure is prevalent in all datasets examined. Preliminary observations reveal further evidence of a hierarchical length scale distribution of structures within turbulent boundary layers, leading to zonal-like organisations. Interpretation of these results is aided by employing synthetic velocity fields generated using the attached-eddy mod..

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