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Stability and Coherent Structures in the Wake of Axisymmetric Bluff Bodies

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Instability and Control of Massively Separated Flows

Part of the book series: Fluid Mechanics and Its Applications ((FMIA,volume 107))

Abstract

The coherent structures observed in the turbulent wake of axisymmetric bluff bodies are investigated. Concepts from hydrodynamic stability are used to derive low-dimensional mathematical models based on a weakly nonlinear analysis of the governing Navier-Stokes equations that describe the temporal amplitude evolution of the coherent structures in the near wake. Forced experiments applying axisymmetric pulsed-jet blowing on the base of the body are performed to validate the models. Very good quantitative agreement between model predictions and experiments is obtained, showing for the first time that Landau-type models are capable of describing the dynamic behavior of a three-dimensional turbulent wake.

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Acknowledgments

We are indebted to EPSRC (Grant EP/I005684) for financial support.

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Authors and Affiliations

  1. Department of Aeronautics, Imperial College London, London, UK

    Georgios Rigas, Aimee S. Morgans & Jonathan F. Morrison

Authors
  1. Georgios Rigas
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  2. Aimee S. Morgans
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  3. Jonathan F. Morrison
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Corresponding author

Correspondence to Georgios Rigas .

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Editors and Affiliations

  1. School of Aerospace Engineering, Technical University of Madrid, Madrid, Spain

    Vassilis Theofilis

  2. Department of Mechanical and Aerospace Engineering, Monash University, Melbourne, VIC, Australia, and Department of Aeronautical Engineering, King Abdulaziz University, Jeddah, Saudi Arabia

    Julio Soria

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© 2015 Springer International Publishing Switzerland

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Rigas, G., Morgans, A.S., Morrison, J.F. (2015). Stability and Coherent Structures in the Wake of Axisymmetric Bluff Bodies. In: Theofilis, V., Soria, J. (eds) Instability and Control of Massively Separated Flows. Fluid Mechanics and Its Applications, vol 107. Springer, Cham. https://doi.org/10.1007/978-3-319-06260-0_21

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  • DOI: https://doi.org/10.1007/978-3-319-06260-0_21

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  • Publisher Name: Springer, Cham

  • Print ISBN: 978-3-319-06259-4

  • Online ISBN: 978-3-319-06260-0

  • eBook Packages: EngineeringEngineering (R0)

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