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Fluid-Structure-Sound Interactions and Control pp 83–88Cite as

POD Study of a Turbulent Boundary Layer Over a Rough Forward-Facing Step

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Part of the book series: Lecture Notes in Mechanical Engineering ((LNME))

Abstract

Large-scale fluctuating flow structures are studied using snapshot proper orthogonal decomposition (POD) in a turbulent boundary layer over a realistic rough forward-facing step (FFS) at Re h  = 3,450 and δ/h = 8. It was observed that large-scale Q2 event induced by hairpin vortex packet and large-scale Q4 event are the dominant fluctuating flow structures that contribute significantly to the first POD mode for both smooth and rough steps. However, the flow structures close to the rough surface were affected differently by different roughness topographies.

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References

  • Hattori H, Nagano Y (2010) Investigation of turbulent boundary layer over forward-facing step via direct numerical simulation. Int J Heat Fluid Flow 31:284–294

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  • Ren H, Wu Y (2011) Turbulent boundary layers over smooth and rough forward-facing steps. Phys Fluids 23:045102

    Article  Google Scholar 

  • Wu Y, Christensen KT (2010) Spatial structure of a turbulent boundary layer with irregular surface roughness. J Fluid Mech 655:380–418

    Article  MATH  Google Scholar 

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Author information

Authors and Affiliations

  1. School of Mechanical and Aerospace Engineering, Nanyang Technological University, Singapore, Singapore

    Yanhua Wu & Hui Tang

Authors
  1. Yanhua Wu
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  2. Hui Tang
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Corresponding author

Correspondence to Yanhua Wu .

Editor information

Editors and Affiliations

  1. The Hong Kong Polytechnic University, Hong Kong, People's Republic of China

    Yu Zhou

  2. The Hong Kong Polytechnic University, Hong Kong, People's Republic of China

    Yang Liu

  3. The University of Hong Kong, Hong Kong, People's Republic of China

    Lixi Huang

  4. Georgia Institute of Technology, Atlanta, Georgia, USA

    Dewey H. Hodges

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© 2014 Springer-Verlag Berlin Heidelberg

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Cite this paper

Wu, Y., Tang, H. (2014). POD Study of a Turbulent Boundary Layer Over a Rough Forward-Facing Step. In: Zhou, Y., Liu, Y., Huang, L., Hodges, D. (eds) Fluid-Structure-Sound Interactions and Control. Lecture Notes in Mechanical Engineering. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-40371-2_11

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  • DOI: https://doi.org/10.1007/978-3-642-40371-2_11

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  • Publisher Name: Springer, Berlin, Heidelberg

  • Print ISBN: 978-3-642-40370-5

  • Online ISBN: 978-3-642-40371-2

  • eBook Packages: EngineeringEngineering (R0)

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