Abstract
Abstract
Highlights
Two-dimensional internal shear layer structures were reported before in turbulent boundary layers (TBLs) by Meinhart & Adrian (1995) and Adrian, Meinhart & Tomkins (2000) as the regions where high gradients in the streamwise velocity occur; and by Eisma et al (2015) as highly sheared regions
This paper provides an experimental investigation on the internal shear layers and the edges of the uniform momentum zones (UMZs) in a turbulent pipe flow
To address some of the above questions, we provide a comprehensive analysis of internal shear layers based on the experimental databases acquired with time-resolved stereoscopic particle image velocimetry (PIV) in the cross-section of a turbulent pipe flow which can be reconstructed into quasi-instantaneous 3-D realizations, following van Doorne & Westerweel (2007)
Summary
Two-dimensional internal shear layer structures were reported before in turbulent boundary layers (TBLs) by Meinhart & Adrian (1995) and Adrian, Meinhart & Tomkins (2000) as the regions where high gradients in the streamwise velocity occur; and by Eisma et al (2015) as highly sheared regions In these studies, it was shown that the shear layers are bounding large-scale energetic motions that have nearly uniform streamwise velocities. Shear layers may be important general features of turbulence This finds statistical support in the average flow field associated with turbulent strain, which reveals a shear layer bounded by two large-scale approximately uniform flow regions similar to the instantaneous internal shear layers (Wei et al 2014; Elsinga et al 2017).
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