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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/46457

Title: Asymmetry and bifurcations in three-dimensional sudden-contraction channel flows
Authors: Chiang TP;Sau A;Hwang RR.
Contributors: 國立臺灣海洋大學:機械與機電工程學系
Date: 2011
Issue Date: 2018-05-17T07:44:49Z
Publisher: Phys Rev E Stat Nonlin Soft Matter Phys
Abstract: Abstract:This study reports the presence of two different stable modes of bifurcation in the near field of a three-dimensional sudden contraction. To be precise, flow downstream of a symmetric sudden contraction undergoes a transition from a symmetric state to an asymmetric state through a symmetry-breaking pitchfork bifurcation following an increase in the channel aspect ratio or the Reynolds number. In addition, the oncoming (upstream) symmetry-plane flow exhibits spanwise bifurcations along the topological core lines of each of the salient roof and floor eddies. Small aspect-ratio (contraction) channels are noted to facilitate interesting splitting of the salient roof and floor eddies into multicore forms with accompanying spanwise flow bifurcations along the respective vortical core lines. Herein extensive three-dimensional simulations performed with various aspect and contraction ratios and Reynolds numbers clearly suggest that flow transition in the sudden-contraction channels should indeed occur primarily through these two generically distinct modes of bifurcation.
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/46457
Appears in Collections:[系統工程暨造船學系] 期刊論文

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