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Symposium on Field of the Research Unit 1066

FOR 1066 2014: Advances in Simulation of Wing and Nacelle Stall pp 23–39Cite as

Computations of Separated Flows with a Hybrid RANS/LES Approach

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Part of the book series: Notes on Numerical Fluid Mechanics and Multidisciplinary Design ((NNFM,volume 131))

Abstract

In an effort to accurately compute nacelle stall processes, the research unit FOR1066 (Simulation of Wing and Nacelle Stall) has been working extensively on the development of advanced simulation methods. Due to the high dependency of the separation aerodynamics on the turbulent structures developed within the boundary layer, embedded LES methods appear promising to reliably compute such processes. Nevertheless, these approaches are characterized by exhibiting a very long “grey area“ (also known as adaptation distance) that may lead to the degradation of the whole solution. To shorten this adaptation distance, an advanced synthetic turbulence generator is implemented that forces the development of resolved turbulence at the inlet of the LES domain. The implementation is accessed for a zero pressure gradient flat plate, the HGR-01 airfoil, and a subsonic flow-through nacelle case. The numerical results are validated against experimental data and compared with numerical results without applying synthetic turbulence forcing. Results show that the implementation considerably reduces the required adaptation distance enhancing the overall solution. However, the success of the computation also depends on the solver numerical settings and the grid resolution.

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Author information

Authors and Affiliations

  1. Institut für Strömungsmechanik - TU Braunschweig, 38108, Braunschweig, Germany

    Daniela G. Francois & Rolf Radespiel

  2. Institute of Aerodynamics and Flow Technology, DLR, 37073, Göttingen, Germany

    Silvia Reuß & Axel Probst

Authors
  1. Daniela G. Francois
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  2. Rolf Radespiel
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  3. Silvia Reuß
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  4. Axel Probst
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Corresponding author

Correspondence to Daniela G. Francois .

Editor information

Editors and Affiliations

  1. Institute of Fluid Mechanics, Technische Universität Braunschweig, Braunschweig, Germany

    Rolf Radespiel

  2. Institute of Jet Propulsion, Universität der Bundeswehr München, Neubiberg, Germany

    Reinhard Niehuis

  3. Institute of Aerodynamics and Flow Technology, German Aerospace Center (DLR), Braunschweig, Germany

    Norbert Kroll

  4. Institute of Fluid Mechanics, Technische Universität Braunschweig, Braunschweig, Germany

    Kathrin Behrends

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© 2016 Springer International Publishing Switzerland

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Francois, D.G., Radespiel, R., Reuß, S., Probst, A. (2016). Computations of Separated Flows with a Hybrid RANS/LES Approach. In: Radespiel, R., Niehuis, R., Kroll, N., Behrends, K. (eds) Advances in Simulation of Wing and Nacelle Stall. FOR 1066 2014. Notes on Numerical Fluid Mechanics and Multidisciplinary Design, vol 131. Springer, Cham. https://doi.org/10.1007/978-3-319-21127-5_2

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  • DOI: https://doi.org/10.1007/978-3-319-21127-5_2

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  • Publisher Name: Springer, Cham

  • Print ISBN: 978-3-319-21126-8

  • Online ISBN: 978-3-319-21127-5

  • eBook Packages: EngineeringEngineering (R0)

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