The role of aspect ratio on the dynamic stall process of swept finite wings is investigated using high-fidelity implicit large-eddy simulations. Two aspect ratios ( ARs = 4 and 8) are explored for a 30 deg swept wing (NACA 0012) pitching sinusoidally from an initial incidence of 4 deg to a maximum angle of attack of 22 deg with a reduced frequency of π / 16 over one pitching cycle. The flow is simulated at a chord Reynolds number of 2.0 × 10 5 and a freestream Mach number of 0.1 . The unsteady three-dimensional flowfield for the higher-aspect-ratio wing showed similarity with the lower-aspect-ratio wing through the initial flow separation at the leading edge. Motion-induced effects promoted earlier initiation of the unsteady vortical structures at higher aspect ratios. The vortex tube at the larger span underwent significant distortion, which contrasted with the Λ vortex observed at the lower span. The vortical structure eventually interacted with the trailing-edge vortex, which was not observed at AR = 4 . Examination of the unsteady loads detailed a larger lift slope, mean values, peak values, and earlier stall as the aspect ratio increased. Analysis of the aerodynamic pitch damping suggests the AR = 8 wing is less susceptible to local torsional instabilities than the AR = 4 wing.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Effect of Aspect Ratio on Swept-Wing Dynamic Stall


    Contributors:

    Published in:

    AIAA Journal ; 61 , 10 ; 4367-4377


    Publication date :

    2023-10-01




    Type of media :

    Conference paper , Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English




    EFFECT OF ASPECT RATIO ON SWEPT WING DYNAMIC STALL

    Hammer, Patrick R. / Garmann, Daniel J. / Visbal, Miguel R. | TIBKAT | 2021


    Effect of Aspect Ratio on Swept Wing Dynamic Stall

    Hammer, Patrick R. / Garmann, Daniel J. / Visbal, Miguel R. | AIAA | 2021


    Dynamic Stall Flow Structure During Pitching of Moderate Swept Finite-Aspect Ratio Wing

    Ullah, Al Habib / Fabijanic, Charles / Refling, William et al. | AIAA | 2022


    Aspect-Ratio Effects for Low-Order Modeling of Swept-Wing Stall

    Jamwal, Abhimanyu / Hosangadi, Pranav / Gopalarathnam, Ashok | AIAA | 2018


    ASPECT RATIO EFFECT ON FINITE WING DYNAMIC STALL

    Hammer, Patrick R. / Garmann, Daniel J. / Visbal, Miguel | TIBKAT | 2021