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

Carl D. Meinhart, Ronald J. Adrian

Research output: Contribution to journalArticlepeer-review

195 Scopus citations


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
Issue number4
StatePublished - 1995
Externally publishedYes

ASJC Scopus subject areas

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


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