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New Results in Numerical and Experimental Fluid Mechanics XI pp 349–358Cite as

Study About Boundary-Layer Suction at a Juncture for Sustained Laminar Flow

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Part of the book series: Notes on Numerical Fluid Mechanics and Multidisciplinary Design ((NNFM,volume 136))

Abstract

Two-dimensional direct numerical simulations (DNS) are used to study the influence of active and passive suction at the juncture between two wing elements on laminar-turbulent transition. Suction is applied through the juncture’s gap in front of a forward-facing step. For first, fundamental investigations, the juncture is located in a compressible flat-plate boundary-layer flow without streamwise pressure gradient. To quantify the impact of suction on laminar-turbulent transition, N-factors are calculated. For this, the growth of introduced Tollmien-Schlichting (TS) waves is evaluated according to the \(e^N\) method. Depending on the perilousness of juncture shapes, suction is capable or incapable to compensate their negative impact on laminar-turbulent transition. In addition to active suction, a method allowing passive suction is presented. The work concludes with a discussion about possible integrations of suction at aerodynamic elements, in particular at wings.

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References

  1. Edelmann, C.A., Rist, U.: Impact of forward-facing steps on laminar-turbulent transition in transonic flows. AIAA J. https://doi.org/10.2514/1.J053529 (2015)

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Authors and Affiliations

  1. Institute of Aerodynamics and Gas Dynamics, Pfaffenwaldring 21, 70569, Stuttgart, Germany

    Johannes Zahn & Ulrich Rist

Authors
  1. Johannes Zahn
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  2. Ulrich Rist
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Corresponding author

Correspondence to Johannes Zahn .

Editor information

Editors and Affiliations

  1. Institut für Aerodynamik und Strömungstechnik, Deutsches Zentrum für Luft- und Raumfahrt, Göttingen, Germany

    Andreas Dillmann

  2. Airbus Deutschland, Bremen, Germany

    Gerd Heller

  3. Institut für Aerodynamik und Gasdynamik, Universität Stuttgart, Stuttgart, Germany

    Ewald Krämer

  4. Institut für Aerodynamik und Strömungstechnik, Deutsches Zentrum für Luft- und Raumfahrt, Göttingen, Germany

    Claus Wagner

  5. Institut für Strömungsmechanik, Technische Universität Braunschweig, Braunschweig, Germany

    Stephan Bansmer

  6. Institut für Strömungsmechanik, Technische Universität Braunschweig, Braunschweig, Germany

    Rolf Radespiel

  7. Institut für Strömungsmechanik, Technische Universität Braunschweig, Braunschweig, Germany

    Richard Semaan

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Zahn, J., Rist, U. (2018). Study About Boundary-Layer Suction at a Juncture for Sustained Laminar Flow. In: Dillmann, A., et al. New Results in Numerical and Experimental Fluid Mechanics XI. Notes on Numerical Fluid Mechanics and Multidisciplinary Design, vol 136. Springer, Cham. https://doi.org/10.1007/978-3-319-64519-3_32

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  • DOI: https://doi.org/10.1007/978-3-319-64519-3_32

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  • Publisher Name: Springer, Cham

  • Print ISBN: 978-3-319-64518-6

  • Online ISBN: 978-3-319-64519-3

  • eBook Packages: EngineeringEngineering (R0)

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