Small-scale aspects of flows in proximity of the turbulent/nonturbulent interface

M. Holzner*, A. Liberzon, N. Nikitin, W. Kinzelbach, A. Tsinober

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

77 Scopus citations

Abstract

The work reported below is the first of its kind to study the properties of turbulent flow without strong mean shear in a Newtonian fluid in proximity of the turbulent/nonturbulent interface, with emphasis on the small-scale aspects. The main tools used are a three-dimensional particle tracking system allowing one to measure and follow in a Lagrangian manner the field of velocity derivatives and direct numerical simulations. The comparison of flow properties in the turbulent (A), intermediate (B), and nonturbulent (C) regions in the proximity of the interface allows for direct observation of the key physical processes underlying the entrainment phenomenon. The differences between small-scale strain and enstrophy are striking and point to the definite scenario of turbulent entrainment via the viscous forces originating in strain.

Original languageEnglish
Article number071702
JournalPhysics of Fluids
Volume19
Issue number7
DOIs
StatePublished - Jul 2007

Funding

FundersFunder number
Russian Foundation for Basic Research05-01-00607
Eidgenössische Technische Hochschule Zürich0-20151-03

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