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Large-Scale Streamwise Vortices in Turbulent Channel Flow Induced by Active Wall Actuations

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Abstract

Direct numerical simulations of turbulent flow in a plane channel using spanwise alternatively distributed strips (SADS) are performed to investigate the characteristics of large-scale streamwise vortices (LSSVs) induced by small-scale active wall actuations, and their role in suppressing flow separation. SADS control is obtained by alternatively applying out-of-phase control (OPC) and in-phase control (IPC) to the wall-normal velocity component of the lower channel wall, in the spanwise direction. Besides the non-controlled channel flow simulated as a reference, four controlled cases with 1, 2, 3 and 4 pairs of OPC/IPC strips are studied at M = 0.2 and R e = 6,000, based on the bulk velocity and the channel half height. The case with 2 pairs of strips, whose width is Δz + = 264 based on the friction velocity of the non-controlled case, is the most effective in terms of generating large-scale motions. It is also found that the OPC (resp. IPC) strips suppress (resp. enhance) the coherent structures and that leads to the creation of a vertical shear layer, which is responsible for the LSSVs presence. They are in a statistically steady state and their cores are located between two neighbouring OPC and IPC strips. These motions contribute significantly to the momentum transport in the wall-normal and spanwise directions showing potential for flow separation suppression.

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Acknowledgments

The project is supported by the Key Subjects of the National Natural Science Foundation of China (51420105008, 11572025 and 51476004), the UK Turbulence Consortium via EPSRC (Grant number EP/L000261/1), and the Department of Research and Advanced Engineering of PSA. The authors also would like to thank EPSRC for the use of ARCHER for running the simulations and the STFC Hartree Centre for post-processing the data.

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Authors and Affiliations

  1. National Key Laboratory of Science and Technology on Aero-Engine Aero-Thermodynamics, School of Energy and Power Engineering, Beihang University, Bei**g, 100191, China

    Weidan Ni, Lipeng Lu & Jian Fang

  2. Scientific Computing Department, Science & Technology Facilities Council Daresbury Laboratory, Warrington, WA4 4AD, UK

    Weidan Ni, Jian Fang & Charles Moulinec

  3. Department of Engineering Design and Mathematics, University of the West of England, Bristol, BS16 1QY, UK

    Yufeng Yao

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  1. Weidan Ni
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Correspondence to Jian Fang.

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Ni, W., Lu, L., Fang, J. et al. Large-Scale Streamwise Vortices in Turbulent Channel Flow Induced by Active Wall Actuations. Flow Turbulence Combust 100, 651–673 (2018). https://doi.org/10.1007/s10494-017-9871-5

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  • DOI: https://doi.org/10.1007/s10494-017-9871-5

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