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Modelling and Numerical Simulation for Flow Control

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Advances in Effective Flow Separation Control for Aircraft Drag Reduction

Part of the book series: Computational Methods in Applied Sciences ((COMPUTMETHODS,volume 52))

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Abstract

This study deals with numerical prediction through Improved-Delayed-Detached-Eddy Simulation of the separating-reattaching flow over a backward-facing step and the manipulated flow with harmonic actuation for investigating the mechanism of reattaching acceleration. The predicted base flow agrees well with the experimental results in terms of both the time-averaged sense and the spectra content. Mode decomposition analyses, including Proper Orthogonal Decomposition and Dynamic Mode Decomposition are applied to the base flow data to extract the salient coherent structures, that is, shear layer mode and shedding mode. Then the base flow is excited with slot-shaped harmonic actuators with different excitation amplitudes and frequencies corresponding to those of the salient coherent structures. The flow data are analyzed with Triple Decomposition Technique to recognize the excited flow due to the actuation. We find that the reattachment is accelerated under the excitation of shear layer mode, while a significant promotion obtained under the excitation of vortex pairing. A better understanding of the separating-reattaching flow is presented and the mechanism of reattaching acceleration is finally proposed.

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Authors and Affiliations

  1. School of Mechanical Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai, 200240, China

    Ruyun Hu

  2. School of Aerospace Engineering, Tsinghua University, Haidian District, Beijing, 100084, China

    Liang Wang & Song Fu

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

Correspondence to Song Fu .

Editor information

Editors and Affiliations

  1. Department of Mechanical Engineering, University of Sheffield, Sheffield, UK

    Ning Qin

  2. Universitat Politècnica de Catalunya, International Center for Numerical Methods in Engineering, Barcelona, Spain

    Jacques Periaux

  3. Universitat Politècnica de Catalunya, International Center for Numerical Methods in Engineering, Barcelona, Spain

    Gabriel Bugeda

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Hu, R., Wang, L., Fu, S. (2020). Modelling and Numerical Simulation for Flow Control. In: Qin, N., Periaux, J., Bugeda, G. (eds) Advances in Effective Flow Separation Control for Aircraft Drag Reduction. Computational Methods in Applied Sciences, vol 52. Springer, Cham. https://doi.org/10.1007/978-3-030-29688-9_16

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  • DOI: https://doi.org/10.1007/978-3-030-29688-9_16

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  • Publisher Name: Springer, Cham

  • Print ISBN: 978-3-030-29687-2

  • Online ISBN: 978-3-030-29688-9

  • eBook Packages: EngineeringEngineering (R0)

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