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ICHMT DIGITAL LIBRARY ONLINE

ISSN 961-91393-0-5

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Year 2006

Volume 1 - Turbulence, Heat and Mass Transfer 5
Proceeding of The International Symposium on Turbulence, Heat and Mass Transfer - Dubrovnik, Croatia, September 25-29, 2006

806 pages

Volume price - $246.00

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

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

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

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

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 Re_λ ≈ 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.