Lagrangian properties of the entrainment across turbulent/non-turbulent interface layers

Tomoaki Watanabe, Carlos B. Da Silva, Yasuhiko Sakai, Koji Nagata, Toshiyuki Hayase

Research output: Contribution to journalArticlepeer-review

26 Citations (Scopus)

Abstract

Lagrangian statistics obtained from direct numerical simulations of turbulent planar jets and mixing layers are reported for the separation distance between the tracer particles at the outer edge of the turbulent/non-turbulent interface layer, and the entrained fluid particles. In the viscous superlayer (VSL) the mean square particle distance exhibits a ballistic evolution, while the Richardson-like scaling for relative dispersion prevails inside the turbulent sublayer (TSL). The results further support the existence of two different regimes within the interface layer, where small-scale outward enstrophy diffusion governs the entrained particles in the VSL, while inviscid small-scale motions govern the TSL.

Original languageEnglish
Article number31701
JournalPhysics of Fluids
Volume28
Issue number3
DOIs
Publication statusPublished - 2016 Mar 1

ASJC Scopus subject areas

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

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