Intermittency of acceleration in isotropic turbulence

Sang Lee, Changhoon Lee

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

The intermittency of acceleration is investigated for isotropic turbulence using direct numerical simulation. Intermittently found acceleration of large magnitude always points towards the rotational axis of a vortex filament, indicating that the intermittency of acceleration is associated with the rotational motion of the vortices that causes centripetal acceleration, which is consistent with the reported result for the near-wall turbulence. Furthermore, investigation on movements of such vortex filaments provides some insights into the dynamics of local dissipation, enstrophy and acceleration. Strong dissipation partially covering the edge of a vortex filament shows weak correlation with enstrophy, while it is strongly correlated with acceleration.

Original languageEnglish
Article number056310
JournalPhysical Review E - Statistical, Nonlinear, and Soft Matter Physics
Volume71
Issue number5
DOIs
Publication statusPublished - 2005 May 1

Fingerprint

isotropic turbulence
Intermittency
intermittency
Turbulence
vortex filaments
Vortex Filament
vorticity
Dissipation
dissipation
direct numerical simulation
Vortex
coverings
Covering
turbulence
vortices
Motion
causes

All Science Journal Classification (ASJC) codes

  • Statistical and Nonlinear Physics
  • Statistics and Probability
  • Condensed Matter Physics

Cite this

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Intermittency of acceleration in isotropic turbulence. / Lee, Sang; Lee, Changhoon.

In: Physical Review E - Statistical, Nonlinear, and Soft Matter Physics, Vol. 71, No. 5, 056310, 01.05.2005.

Research output: Contribution to journalArticle

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AB - The intermittency of acceleration is investigated for isotropic turbulence using direct numerical simulation. Intermittently found acceleration of large magnitude always points towards the rotational axis of a vortex filament, indicating that the intermittency of acceleration is associated with the rotational motion of the vortices that causes centripetal acceleration, which is consistent with the reported result for the near-wall turbulence. Furthermore, investigation on movements of such vortex filaments provides some insights into the dynamics of local dissipation, enstrophy and acceleration. Strong dissipation partially covering the edge of a vortex filament shows weak correlation with enstrophy, while it is strongly correlated with acceleration.

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