Conditional eddies in isotropic turbulence

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129 Citations (Scopus)

Abstract

Isotropic turbulence is examined for the existence of conditional flow structures by computing estimates of the velocity u(x + r, t) given that the velocity at (x, t) assumes some specified value, u(x, t). In general, the best mean-square estimate of u(x + r, t) is the conditional average 〈u(x + r, t)| u(x, t)〉. This quantity is approximated in terms of second- and third-order two-point spatial correlations using nonlinear estimation techniques. The estimate predicts conditional eddies that are vortex rings axisymmetric about the direction of u(x, t). Averaging these estimates over all values of u(x, t) yields two-point moments that are correct through third order.

Original languageEnglish (US)
Pages (from-to)2065-2070
Number of pages6
JournalPhysics of Fluids
Volume22
Issue number11
StatePublished - 1979
Externally publishedYes

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isotropic turbulence
Turbulence
vortices
Flow structure
estimates
Vortex flow
vortex rings
moments
Direction compound

ASJC Scopus subject areas

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

Cite this

Conditional eddies in isotropic turbulence. / Adrian, Ronald.

In: Physics of Fluids, Vol. 22, No. 11, 1979, p. 2065-2070.

Research output: Contribution to journalArticle

Adrian, Ronald. / Conditional eddies in isotropic turbulence. In: Physics of Fluids. 1979 ; Vol. 22, No. 11. pp. 2065-2070.
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