# Characteristics of single and multiple bursting events in the inner layer. Part 2. Level-crossing events

Characteristics of single and multiple bursting events in the inner layer. Part 2. Level-crossing... The grouping method we developed in earlier work is applied to the ejections identified by level crossings of the u′v′ signal in the inner layer of a fully developed turbulent channel flow. The groups of ejections and solitary events are separately investigated. Their frequencies, contributions to the mean $$\overline {u'v'}$$ and related conditional averages are reported. It is argued that the packets and single events result from different regeneration mechanisms. The coherent streamwise alignment of the structures within the groups makes the associated scale significantly large. The groups transport large values of the kinetic energy and of the Reynolds shear stress. The results confirm recent studies and show that the main features of the near-wall turbulence dynamics can be adequately revealed by single-point measurements. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Experiments in Fluids Springer Journals

# Characteristics of single and multiple bursting events in the inner layer. Part 2. Level-crossing events

, Volume 33 (5) – Nov 21, 2002
13 pages

/lp/springer_journal/characteristics-of-single-and-multiple-bursting-events-in-the-inner-i0B0mx03zp
Publisher
Springer-Verlag
Subject
Engineering; Engineering Fluid Dynamics; Fluid- and Aerodynamics; Engineering Thermodynamics, Heat and Mass Transfer
ISSN
0723-4864
eISSN
1432-1114
D.O.I.
10.1007/s00348-002-0482-z
Publisher site
See Article on Publisher Site

### Abstract

The grouping method we developed in earlier work is applied to the ejections identified by level crossings of the u′v′ signal in the inner layer of a fully developed turbulent channel flow. The groups of ejections and solitary events are separately investigated. Their frequencies, contributions to the mean $$\overline {u'v'}$$ and related conditional averages are reported. It is argued that the packets and single events result from different regeneration mechanisms. The coherent streamwise alignment of the structures within the groups makes the associated scale significantly large. The groups transport large values of the kinetic energy and of the Reynolds shear stress. The results confirm recent studies and show that the main features of the near-wall turbulence dynamics can be adequately revealed by single-point measurements.

### Journal

Experiments in FluidsSpringer Journals

Published: Nov 21, 2002

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