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Comparative Study of Vorticity and Material Lines Evolution in Numerical Turbulence − the Role of Forcing

DOI: 10.1615/ICHMT.2006.TurbulHeatMassTransf.90
pages 105-108

B. Galanti
Department of Fluid Mechanics and Heat Transfer, School of Mechanical Engineering, Tel-Aviv University, P.O. Box 39040, Tel-Aviv 69978, Israel

Dmitri Gendler- Fishman
Department of Fluid Mechanics and Heat Transfer, School of Mechanical Engineering, Tel-Aviv University, P.O. Box 39040, Tel-Aviv 69978, Israel

Arkady Tsinober
Department of Fluid Mechanics and Heat Transfer, School of Mechanical Engineering, Tel-Aviv University, Tel-Aviv, Israel; and Institute for Mathematical Sciences and Department of Aeronautics, Imperial College, London, United Kingdom

Abstract

A comparative study of the differences in the evolution processes of vorticity and material lines based on DNS of NSE is performed at low Reynolds number Reλ ≈ 50 for time periods up to 15 Kolmogorov microscales. In order to observe such differences we looked for regions in which the forcing and the viscous terms are approximately balancing each other (in the sense as defined in the main text) and used the Lagrangian tracking of fluid particles originating from these regions for time periods during which the above balance between the forcing and the viscous terms remain valid.

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