Very large-scale motion in the outer layer

K. C. Kim, Ronald Adrian

Research output: Contribution to journalArticle

502 Citations (Scopus)

Abstract

Very large-scale motions in the form of long regions of streamwise velocity fluctuation are observed in the outer layer of fully developed turbulent pipe flow over a range of Reynolds numbers. The premultiplied, one-dimensional spectrum of the streamwise velocity measured by hot-film anemometry has a bimodal distribution whose components are associated with large-scale motion and a range of smaller scales corresponding to the main turbulent motion. The characteristic wavelength of the large-scale mode increases through the logarithmic layer, and reaches a maximum value that is approximately 12-14 times the pipe radius, one order of magnitude longer than the largest reported integral length scale, and more than four to five times longer than the length of a turbulent bulge. The wavelength decreases to approximately two pipe radii at the pipe centerline. It is conjectured that the very large-scale motions result from the coherent alignment of large-scale motions in the form of turbulent bulges or packets of hairpin vortices.

Original languageEnglish (US)
Pages (from-to)417-422
Number of pages6
JournalPhysics of Fluids
Volume11
Issue number2
StatePublished - Feb 1999
Externally publishedYes

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Pipe
Wavelength
Pipe flow
Vortex flow
Reynolds number
horseshoe vortices
pipe flow
radii
velocity measurement
wavelengths
alignment

ASJC Scopus subject areas

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

Cite this

Very large-scale motion in the outer layer. / Kim, K. C.; Adrian, Ronald.

In: Physics of Fluids, Vol. 11, No. 2, 02.1999, p. 417-422.

Research output: Contribution to journalArticle

Kim, KC & Adrian, R 1999, 'Very large-scale motion in the outer layer', Physics of Fluids, vol. 11, no. 2, pp. 417-422.
Kim, K. C. ; Adrian, Ronald. / Very large-scale motion in the outer layer. In: Physics of Fluids. 1999 ; Vol. 11, No. 2. pp. 417-422.
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