Conditional sampling of dissipation in moderate Reynolds number grid turbulence

S. T. Thoroddsen*

*Corresponding author for this work

Research output: Contribution to journalLetterpeer-review

2 Scopus citations

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 velocity components, at turbulent Rey‐ nolds numbers Reλ of 160 and 230. The dissipation was approximated with pseudo‐ or surro‐ gate dissipation εr based on one or two velocity gradients. The conditioned dissipation εr inside the most intense large‐scale rotational regions of the flow is more than twice as large as the expected value of εr over the whole domain. Conditional averaging was also carried out over strong large‐scale fronts showing smaller excess in dissipation.

Original languageEnglish (US)
Pages (from-to)1333-1335
Number of pages3
JournalPhysics of Fluids
Volume8
Issue number5
DOIs
StatePublished - May 1996
Externally publishedYes

Keywords

  • ENERGY LOSSES
  • HOT WIRE ANEMOMETERS
  • REYNOLDS NUMBER
  • TURBULENT FLOW
  • VISCOUS FLOW

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Fluid Flow and Transfer Processes
  • Computational Mechanics

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