This paper investigates suppressing the pitching oscillation of a NACA 0012 airfoil at a Reynolds number of 1.35 × 10 5 by using phase-shifted trailing-edge morphing. The latter considering geometric nonlinearity is simulated numerically based on spatiotemporal polynomial surface fitting. Flowfield results and aerodynamic forces are obtained by solving the unsteady Reynolds-averaged Navier–Stokes equations accompanied by a low-Reynolds-number modified-shear-stress transport model. Dynamic meshing combining a sliding mesh and Laplacian diffusion is developed to deal with the deformation of the computational grid due to the large-amplitude coupled pitching and morphing motion of the airfoil. The airfoil is subjected to stall-flutter analysis from an energy perspective by calculating the energy extracted by the airfoil from the freestream in an oscillation cycle. The flow control mechanism of the phase-offset trailing-edge morphing is analyzed in terms of the pressure distribution and moment contribution. The results suggest that trailing-edge motion with a phase of π / 2 reduces the energy extraction by more than 300% and could be effective for suppressing the stall-flutter limit-cycle oscillation amplitude in specific ranges of amplitude and frequency.


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    Title :

    Effect of Trailing-Edge Morphing on Flow Characteristics Around a Pitching Airfoil


    Contributors:
    Wu, You (author) / Dai, Yuting (author) / Yang, Chao (author) / Hu, Yating (author) / Huang, Guangjing (author)

    Published in:

    AIAA Journal ; 61 , 1 ; 160-173


    Publication date :

    2021-11-09


    Size :

    14 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English



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