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Fourth International Symposium on Turbulence and Shear Flow Phenomena
June, 27-29, 2005, Marriot Hotel, Williamsburg, Virginia, USA

DOI: 10.1615/TSFP4

DNS OF TURBULENT FLOW IN AN ELLIPTICAL DUCT

pages 883-888
DOI: 10.1615/TSFP4.1480
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RESUMO

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. The mean flow characteristics and turbulence statistics have been obtained. The variation of the statistical quantities such as the Reynolds stresses and turbulence intensities along the minor axis of the elliptical cross-section were found to be similar to plane channel data. The turbulent statistics along the major axis was found to be inhibited by the secondary flow transferring high-momentum fluid from the duct's center towards the wall. The instantaneous velocity fields in the near-wall region revealed 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 was found.

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