University of Illinois Urbana-Champaign

Conditional sampling dissipation in high Reynolds number turbulence

Thoroddsen, Sigurdur T.

Permalink

https://hdl.handle.net/2142/112500

Description

Title
Conditional sampling dissipation in high Reynolds number turbulence
Author(s)
Thoroddsen, Sigurdur T.
Issue Date
1995-08
Keyword(s)
  • Conditional Sampling
  • Dissipation
  • High Reynolds Number Turbulence
Abstract
Multi-point hot-wire measurements in grid turbulence have been used to conditionally average the dissipation over inertial-scale features of the turbulent field. Velocities were measured at 5 separate spatial points obtaining six simultaneous velocities components, at turbulent Reynolds numbers Reλ as high as 230. The dissipation was approximated with pseudo-dissipation based on one or two velocity gradients. The conditioned dissipation є1r inside the most intense large-scale rotational regions of the flow is more than twice as large as the expected value of є1r over the whole domain. Conditional averaging was also carried out over large-scale fronts showing smaller excess in dissipation. It is thereby argued that the Kolmogorov Refined Similarity Hypothesis may not be the optimal way of describing the spatial structure of turbulent dissipation.
Publisher
Department of Theoretical and Applied Mechanics. College of Engineering. University of Illinois at Urbana-Champaign
Series/Report Name or Number
  • TAM R 802
  • 1995-6024
ISSN
0073-5264
Type of Resource
text
Language
eng
Permalink
http://hdl.handle.net/2142/112500
Copyright and License Information
Copyright 1995 Board of Trustees of the University of Illinois

Owning Collections

Technical Reports - Theoretical and Applied Mechanics (TAM) PRIMARY
TAM technical reports include manuscripts intended for publication, theses judged to have general interest, notes prepared for short courses, symposia compiled from outstanding undergraduate projects, and reports prepared for research-sponsoring agencies.