Coherent structures in marginally turbulent square duct flow

Markus Uhlmann, Alfredo Pinelli, Atsushi Sekimoto, Genta Kawahara

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Direct numerical simulation of fully developed turbulent flow in a straight square duct was performed in order to determine the minimal requirements for self-sustaining turbulence. It was found that turbulence can be maintained for values of the bulk Reynolds number above approximately 1100, corresponding to a friction-velocity-based Reynolds number of 80. The minimum value for the streamwise period of the computational domain measures around 190 wall units, roughly independently of the Reynolds number. Furthermore, we present a characterization of the marginal state, where coherent structures are found to have significant relevance to the appearance of secondary flow of Prandtl's second kind.

Original languageEnglish
Title of host publicationIUTAM Symposium on Computational Physics and New Perspectives in Turbulence - Proceedings of the IUTAM Symposium on Computational Physics and New Perspectives in Turbulence
Pages137-142
Number of pages6
DOIs
Publication statusPublished - 2008
Externally publishedYes
EventIUTAM Symposium on Computational Physics and New Perspectives in Turbulence - Nagoya, Japan
Duration: Sep 11 2006Sep 14 2006

Publication series

NameSolid Mechanics and its Applications
Volume4
ISSN (Print)1875-3507

Other

OtherIUTAM Symposium on Computational Physics and New Perspectives in Turbulence
Country/TerritoryJapan
CityNagoya
Period9/11/069/14/06

Keywords

  • Coherent structure
  • Marginally turbulent flow
  • Secondary flow
  • Square duct

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Automotive Engineering
  • Aerospace Engineering
  • Acoustics and Ultrasonics
  • Mechanical Engineering

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