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Improved Delayed Detached-Eddy Simulations of Actively Controlled Flow

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Progress in Hybrid RANS-LES Modelling (HRLM 2016)

Part of the book series: Notes on Numerical Fluid Mechanics and Multidisciplinary Design ((NNFM,volume 137))

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Abstract

In this study, Improved Delayed Detached-Eddy Simulations (IDDES) were conducted for active flow control with a harmonic actuation on a backward-facing step (BFS) and pulsed blowing on a NACA0015 airfoil for reattachment and separation controls. By using Dynamic Mode Decomposition, the characteristic physical modes of the unexcited flow have been extracted for both cases. With better understanding of unsteady flow features, effective control practices were illustrated. For the BFS case, the optimum excitation frequency was found identical with the step-mode frequency of the baseline flow. Such harmonic actuation enhanced the pairing process, forming the largest scale spanwise coherent structures in the free shear layer, resulting in 40% the maximum reduction of the bubble length. For the airfoil case, with the optimum excitation frequency that determined by the vortex-shedding mode of the baseline flow, 194% the increase of the lift-to-drag ratio was obtained.

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Acknowledgements

This work was supported by the National Key Basic Research Program of China (2014CB744801), the EU-China Joint Project MARS (266326), the NSFC Grants 11572177, 51376106 & 11272183, and the Tsinghua University initiative Scientific Research Program (2014z21020).

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Authors and Affiliations

  1. Department of Engineering Mechanics, Tsinghua University, 100084, Beijing, China

    Liang Wang & Song Fu

  2. Department of Engineering Mechanics, Shanghai Jiao Tong University, 200240, Shanghai, China

    Ruyun Hu

  3. AVIC Aerodynamics Research Institute, Harbin, China

    Liying Li

Authors
  1. Liang Wang
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  2. Ruyun Hu
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  3. Liying Li
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  4. Song Fu
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Corresponding author

Correspondence to Song Fu .

Editor information

Editors and Affiliations

  1. ICube—Strasbourg University, Strasbourg, France

    Yannick Hoarau

  2. Swedish Defence Research Agency, Information and Aeronautical Systems FOI, Stockholm, Sweden

    Shia-Hui Peng

  3. Deut Zent für Luft- & Rau.V. (DLR), Institut für Aerodynamik und Strömungstechnik, Göttingen, Germany

    Dieter Schwamborn

  4. School of Mechanical, Aerospace and Civil Engineering, The University of Manchester, Manchester, United Kingdom

    Alistair Revell

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Wang, L., Hu, R., Li, L., Fu, S. (2018). Improved Delayed Detached-Eddy Simulations of Actively Controlled Flow. In: Hoarau, Y., Peng, SH., Schwamborn, D., Revell, A. (eds) Progress in Hybrid RANS-LES Modelling. HRLM 2016. Notes on Numerical Fluid Mechanics and Multidisciplinary Design, vol 137. Springer, Cham. https://doi.org/10.1007/978-3-319-70031-1_5

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  • DOI: https://doi.org/10.1007/978-3-319-70031-1_5

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  • Publisher Name: Springer, Cham

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  • Online ISBN: 978-3-319-70031-1

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