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ICHMT DIGITAL LIBRARY ONLINE

ISSN 961-91393-0-5

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Year 2006

• 1Turbulence, 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

Structure of the Scalar Dissipation Field in a Turbulent Channel Flow

H. Abe
Computational Science Research Group, Japan Aerospace Exploration Agency, 182-8522 Tokyo, Japan

R. A. Antonia
School of Mechanical Engineering, University of Newcastle, Newcastle, 2308 NSW, Australia

H. Kawamura
Department of Mechanical Engineering, Tokyo University of Science, 278-8510 Chiba, Japan

ABSTRACT

The structure of the scalar dissipation field is studied by performing direct numerical simulations of a turbulent channel flow with passive scalar transport. The Reynolds number is set to be 180, 395 and 640 based on the friction velocity and the channel half-width. The molecular Prandtl number is 0.71. Near the wall, the scalar dissipation field is associated primarily with anisotropic structures, which reflect the presence of quasi-streamwise vortices and streaks, whereas away from the wall, it is mainly sheet-like in form.