Direct numerical simulation of turbulent flow in a circular pipe subjected to radial system rotation
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Date
2019-04-26
Authors
Zhang, Zhao-Ping
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Abstract
In this thesis, direct numerical simulations have been preformed with a high-order spectral element method computer code to investigate the Coriolis force effect on a fully-developed turbulent flow confined within a circular pipe subjected to radial system rotations. In order to study the radially rotating effects on the flow, a wide range of rotation numbers have been tested. In response to the system rotation imposed, large-scale secondary flows appear as streamwise counter-rotating vortices, which highly interact with the boundary layer and have a significant impact on the turbulent flow structures and dynamics. A quasi Taylor-Proudman region occurs at low rotation numbers, where the mean axial velocity is invariant along the rotating axis. As the rotation number increases, laminarization occurs near the bottom wall of the pipe, and the flow become fully laminarized when the rotation number approaches one. 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, pre-multiplied spectra of velocity fluctuations, budget balance of the transport equation of Reynolds stresses, and coherent flow structures.
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Keywords
Turbulent flow, Circular pipe, Radial system rotation, Coherent structure
Citation
Z.-P. Zhang and B.-C. Wang, "Direct numerical simulation of turbulent flow in circular pipe subjected to radial system rotation", Flow, Turbulence and Combustion (under review, invited for publication in the Journal Special Issue of THMT-9), 2019.
Z.-P. Zhang and B.-C. Wang, "DNS study of turbulent flow in a circular pipe subjected to radial rotation", in Proc. 9th International Symposium on Turbulence, Heat and Mass Transfer (THMT'18), Rio de Janeiro, Brazil, 2018.
Z.-P. Zhang and B.-C. Wang, "On the coherent structures of a radially-rotating turbulent circular pipe flow", in Proc. 26th Annual conference of CFD Society of Canada, Winnipeg, MB, Canada, 2018.
Z.-P. Zhang and B.-C. Wang, "DNS study of turbulent flow in a circular pipe subjected to radial rotation", in Proc. 9th International Symposium on Turbulence, Heat and Mass Transfer (THMT'18), Rio de Janeiro, Brazil, 2018.
Z.-P. Zhang and B.-C. Wang, "On the coherent structures of a radially-rotating turbulent circular pipe flow", in Proc. 26th Annual conference of CFD Society of Canada, Winnipeg, MB, Canada, 2018.