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Direct numerical simulation of turbulent flow in elliptical ducts

Published online by Cambridge University Press:  27 May 2005

NIKOLAY NIKITIN
Affiliation:
Institute of Mechanics, Moscow State University, 1 Michurinsky prospect, 119899 Moscow, Russia
ALEXANDER YAKHOT
Affiliation:
The Pearlstone Centre for Aeronautical Engineering Studies, Department of Mechanical Engineering, Ben-Gurion University of the Negev, Beersheva 84105, Israel

Abstract

Direct numerical simulation (DNS) of fully developed turbulent flow in elliptical ducts is performed. The mean cross-stream secondary flows exhibited by two counter-rotating vortices which are symmetrical about the major ellipse's axis are examined. The mean flow characteristics and turbulence statistics are obtained. The variation of the statistical quantities such as the Reynolds stresses and turbulence intensities along the minor axis of the elliptical cross-section are found to be similar to plane channel data. The turbulent statistics along the major axis are found to be inhibited by the secondary flow transferring high-momentum fluid from the duct's centre towards the wall. The instantaneous velocity fields in the near-wall region reveal structures similar to the ‘streaks’ except in the vicinity of the major axis endpoints where significant reduction of the turbulent activity due to the wall transverse curvature effect is found.

Type
Papers
Copyright
© 2005 Cambridge University Press

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