On the existence of uniform momentum zones in a turbulent boundary layer

Carl D. Meinhart, Ronald Adrian

Research output: Contribution to journalArticle

126 Citations (Scopus)

Abstract

Instantaneous velocity fields in the x-y plane of a zero pressure gradient turbulent boundary layer are measured using particle image velocimetry. It is found that there exist random, time-varying zones in the u-ν fields in which the streamwise momentum is remarkably uniform. The largest dimension of a typical zone is proportional to the boundary layer thickness. The zone closest to the wall contains viscous-inertial inclined structures similar to those found in low Reynolds number wall turbulence. A second zone is located above the wall zone in a region that coincides roughly with the logarithmic layer. The wake region of the boundary layer contains a complicated, time-varying pattern of several nearly-constant-momentum zones. The zones are separated from each other and from the free stream by thin viscous shear layers that contain concentrations of spanwise vorticity.

Original languageEnglish (US)
Pages (from-to)694-696
Number of pages3
JournalPhysics of Fluids
Volume7
Issue number4
StatePublished - 1995
Externally publishedYes

Fingerprint

turbulent boundary layer
Momentum
Boundary layers
momentum
boundary layer thickness
free flow
shear layers
low Reynolds number
particle image velocimetry
Vorticity
Pressure gradient
pressure gradients
wakes
Velocity measurement
vorticity
boundary layers
Reynolds number
Turbulence
velocity distribution
turbulence

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Physics and Astronomy(all)
  • Mechanics of Materials
  • Computational Mechanics
  • Fluid Flow and Transfer Processes

Cite this

On the existence of uniform momentum zones in a turbulent boundary layer. / Meinhart, Carl D.; Adrian, Ronald.

In: Physics of Fluids, Vol. 7, No. 4, 1995, p. 694-696.

Research output: Contribution to journalArticle

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