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DNS study of turbulent flow in a circular pipe subjected to radial rotation

DOI: 10.1615/THMT-18.1140
pages 1013-1024

Zhao-Ping Zhang
Dept. of Mechanical Engineering, Univ. of Manitoba, Winnipeg, MB, R3T 5V6, Canada

Bing-Chen Wang
Department of Mechanical & Manufacturing Engineering, University of Manitoba, Winnipeg, MB, R3T 5V6, Canada

Abstrakt

The effect of Coriolis force on turbulent flow confined within a circular pipe subjected to radial system rotation has been studied using direct numerical simulation (DNS). In order to study the rotating effects, a wide range of rotation numbers have been tested. In response to the system rotation imposed, large-scale secondary flows appear in the form of axial counter-rotating vortices, which have a significant impact on the coherent structures and dynamics of the flow field. A quasi Taylor-Proudman region is observed at moderate rotation numbers, where the mean axial velocity is invariant along the rotating axis. However, full laminarization occurs at high rotation numbers. The characteristics of the flow field are investigated in both physical and spectral spaces, which include the analyses of the first- and second-order statistical moments, two point auto-correlation coefficients, spectra of velocity fluctuations, and budget balance of the transport equation of Reynolds stresses.

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