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

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

doi:10.1063/1.4942959

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

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

FRIS - Frontier Research Institute for Interdisciplinary Sciences (institute affiliation only)

Research output: Contribution to journal › Article › peer-review

38 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 language	English
Article number	31701
Journal	Physics of Fluids
Volume	28
Issue number	3
DOIs	https://doi.org/10.1063/1.4942959
Publication status	Published - 2016 Mar 1

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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.",

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AU - Nagata, Koji

AU - Hayase, Toshiyuki

PY - 2016/3/1

Y1 - 2016/3/1

N2 - 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.

AB - 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.

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

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