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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

Local Statistical Geometry of the Resolved-Scale Velocity and Temperature Gradient Fields in a Vertical Slot Flow

Jing Yin
Department of Mechanical Engineering, University of Saskatchewan, Saskatoon, SK, S7N5A9, Canada

Bing-Chen Wang
Defence Research & Development Canada—Suffield, P.O. Box 4000, Medicine Hat, AB, T1A8K6, Canada

Donald J. Bergstrom
Department of Mechanical Engineering, University of Saskatchewan, Saskatoon, SK, S7N5A9, Canada

ABSTRACT

Local statistical geometrical properties of the resolved-scale velocity gradient tensor and temperature gradient vector are investigated based on large-eddy simulation (LES) of a mixed convection in a vertical slot. Previous studies on turbulence geometry appearing in the literature have primarily focused on either isotropic turbulence or isothermal flow, whereas in this work, we report the effect of thermal buoyancy on the local statistical geometry and the anisotropic behaviours due to existence of the wall. In particular, enstrophy generation, helicity and alignments of vorticity, temperature gradient and SGS heat flux vector with the eigenframe of the strain rate tensor are investigated for both the hot and cold flow regions, respectively.