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Aspect Ratio Effect on Multiple Flow Solutions in a Two-Sided Parallel Motion Lid-Driven Cavity

Published online by Cambridge University Press:  12 August 2014

K.-T. Chen ,
C.-C. Tsai ,
W.-J. Luo ,
C.-W. Lu  and
C.-H. Chen
K.-T. Chen
Affiliation:
Department of Applied Mathematics, National Chung Hsing University, Taichung, Taiwan
C.-C. Tsai
Affiliation:
Department of Applied Mathematics, National Chung Hsing University, Taichung, Taiwan
W.-J. Luo*
Affiliation:
Graduate Institute of Precision Manufacturing, National Chin-Yi University of Technology, Taichung, Taiwan
C.-W. Lu
Affiliation:
Department of Refrigeration, Air Conditioning and Energy Engineering, National Chin-Yi University of Technology, Taichung, Taiwan
C.-H. Chen
Affiliation:
Department of Mechanics, National Chin-Yi University of Technology, Taichung, Taiwan
*
*Corresponding author (wjluo@ncut.edu.tw)
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Abstract

A continuation method, accompanied with a linear stability analysis, is employed to investigate the bifurcation diagram of the flow solutions, as well as the multiple flow states in a cavity with different aspect ratios for parallel motion of two facing lids. The Reynolds number proportional to the wall velocity is used as the continuation parameter, and the evolution of the bifurcation diagrams in cases with different aspect ratios is illustrated. The induced flow patterns are highly dependent upon both the aspect ratios and the moving velocity of the walls. Three different types of bifurcation diagrams and their corresponding flow states are classified according to the aspect ratios. One stable symmetric flow state and one stable asymmetric flow state are identified. The stable asymmetric flow state is obtained at a high aspect ratio and a low Reynolds number. Meanwhile, the regions of stable and unstable flows are distinguished according to the different aspect ratios.

Keywords

InstabilitiesFlow bifurcationLid-driven cavity flowAspect ratio
Type
Research Article
Information
Journal of Mechanics , Volume 31 , Issue 2 , April 2015 , pp. 153 - 160
Copyright
Copyright © The Society of Theoretical and Applied Mechanics, R.O.C. 2014 

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