Abstract
Abstract
Highlights
The structural organisation of wall-bounded turbulent flows has been a topic of great interest for the past several decades and significant development has been achieved during this time
We have mostly focused our attention on the temporal characteristics of P(U, t) and their link to the spatial signature of the underlying velocity structures
The parameter study provided some coarse guidelines for data acquisition and processing while some of the observed trends contributed to our physical understanding of the flow. Both of these were further enhanced with the use of the model datasets: knowledge of the exact velocity scales present in the flow significantly improved spatial and temporal resolution considerations, while the manipulation of geometrical characteristics of the velocity field in a controlled manner allowed us to isolate the spatial characteristics of u responsible for the temporal patterns in P(U, t)
Summary
The structural organisation of wall-bounded turbulent flows has been a topic of great interest for the past several decades and significant development has been achieved during this time. Very-large-scale motions (VLSMs) or superstructures (internal or external geometries, respectively) were identified in the logarithmic region, and large-scale motions (LSMs) in the outer region, linked to the formation of downstream-leaning ramp-like bulges at the boundary with the irrotational free stream (see Kim & Adrian 1999; Zhou et al 1999; Guala, Hommema & Adrian 2006; Balakumar & Adrian 2007; Hutchins & Marusic 2007; Monty et al 2009, among others) Associated with these characteristic elements is another structural feature, observed initially by Meinhart & Adrian (1995) in the outer region of turbulent boundary layers: the organisation of the streamwise velocity into large zones of uniform momentum (UMZs), separated by internal shear layers of concentrated vorticity
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