Observation of vortex packets in direct numerical simulation of fully turbulent channel flow

Ronald Adrian, Z. C. Liu

Research output: Contribution to journalArticle

43 Citations (Scopus)

Abstract

A number of experimental studies have inferred the existence of packets of inclined, hairpin- like vortices in wall turbulence on the basis of observations made in two-dimensional x-y planes using visualization and particle image velocimetry (PIV). However, there are very few observations of hairpins in existing three-dimensional studies made using direct numerical simulation (DNS), and no such study claims to have revealed packets. We demonstrate, for the first time, the existence of hairpin vortex packets in DNS of turbulent flow. The vortex packet structure found in the present study at low Reynolds number, Rer = 300, is consistent with and substantiates the observations and the results from two- dimensional PIV measurements at higher Reynolds numbers in channel, pipe and boundary layer flows. Thus, the evidence supports the view that vortex packets are a universal feature of wall turbulence, independent of effects due to boundary layer trips or critical conditions in the aforementioned numerical studies. Visualization of the DNS velocity field and vortices also shows the close association of hairpin packets with long low-momentum streaks and the regions of high Reynolds shear stress.

Original languageEnglish (US)
Pages (from-to)9-19
Number of pages11
JournalJournal of Visualization
Volume5
Issue number1
StatePublished - 2002
Externally publishedYes

Fingerprint

Direct numerical simulation
channel flow
Channel flow
direct numerical simulation
Vortex flow
vortices
horseshoe vortices
Velocity measurement
particle image velocimetry
Reynolds number
Turbulence
Visualization
turbulence
Boundary layer flow
boundary layer flow
Reynolds stress
high Reynolds number
Turbulent flow
low Reynolds number
Shear stress

Keywords

  • Direct numerical simulation
  • Hairpin vortex packets
  • Hairpin vortices
  • Structure
  • Wall eddies
  • Wall turbulence

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electrical and Electronic Engineering

Cite this

Observation of vortex packets in direct numerical simulation of fully turbulent channel flow. / Adrian, Ronald; Liu, Z. C.

In: Journal of Visualization, Vol. 5, No. 1, 2002, p. 9-19.

Research output: Contribution to journalArticle

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