Conditional sampling of dissipation in moderate Reynolds number grid turbulence

Sigurdur Thoroddsen*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

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 Re λ of 160 and 230. The dissipation was approximated with pseudo‐ or surro‐ gate dissipation ε r based on one or two velocity gradients. The conditioned dissipation ε r inside the most intense large‐scale rotational regions of the flow is more than twice as large as the expected value of ε r 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 - Jan 1 1996

Keywords

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

ASJC Scopus subject areas

  • Condensed Matter Physics

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