Analysis of flow over backward facing step with transition

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• 作者：Dwarikanath Ratha (1)
  Arindam Sarkar (2)
  
  1. Civil Engineering Department ; Thapar University ; Patiala ; Punjab ; 147001 ; India
  2. School of Infrastructure ; Indian Institute of Technology ; Bhubaneswar ; 751013 ; India
  
• 关键词：Reattachment length ; backward facing step ; transition ; flow separation ; k ; 蓻 model
• 刊名：Frontiers of Architecture and Civil Engineering in China
• 出版年：2015
• 出版时间：March 2015
• 年：2015
• 卷：9
• 期：1
• 页码：71-81
• 全文大小：522 KB
• 参考文献：1. Wu, T, Kareem, A (2012) An overview of vortex induced vibration (VIV) of bridge decks. Frontiers of Structural and Civil Engineering 6: pp. 335-347
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  18. Kim, J Y, Ghajar, A J, Tang, C, Foutch, G L (2005) Comparison of near-wall treatment methods for high Reynolds number backward-facing step flow. International Journal of Computational Fluid Dynamics 19: pp. 493-500 CrossRef
  19. Rajesh Kanna, P, Kumar Das, M (2006) A short note on the reattachment length for BFS problem. International Journal for Numerical Methods in Fluids 50: pp. 683-692 CrossRef
  20. Rani, H P, Sheu, T W H, Tsai, E S F (2007) Eddy structures in a transitional backward facing step flow. Journal of Fluid Mechanics 588: pp. 43-58 CrossRef
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• 刊物类别：Engineering
• 刊物主题：Civil Engineering
  Cities, Countries and Regions
  Chinese Library of Science
  
• 出版者：Higher Education Press, co-published with Springer-Verlag GmbH
• ISSN：1673-7512

文摘

The present study deals with the study of the velocity distribution and the separation phenomenon of flow of air over a two dimensional backward facing step. The flow of air over a backward facing step has been investigated numerically using FLUENT. Flow simulation has been carried out in a backward facing step having an expansion ratio (ratio of the height before and after the step) of 1:1.94 and the results obtained are compared with the published experimental results. Comparison of flow characteristics between steps with three different transitions is made. The variation of reattachment length for all the three cases are analyzed for wide range of Reynolds number ranging from 100 to 7000 which covers the laminar, transition and turbulent flow of air. Simulation of the flow over steps with expansion ratios of 1:1.24, 1:1.38, 1:1.47, 1:1.53, 1:1.94, 1:2.20 are also carried out to examine the effect of different expansion ratios on the reattachment length. It is found that the primary reattachment length increases with increase in the expansion ratio. The primary reattachment length at the bottom wall downstream of the step is minimum for the step with round edged transition and maximum for the step with a vertical drop transition.