• Multi-fidelity surrogate model-based airfoil optimization at a transitional low Reynolds number

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    • Keywords


      Low Reynolds number flow; laminar-turbulent transition; aerodynamic shape optimization; surrogate modeling; trust-region method.

    • Abstract


      The aerodynamic design optimization of an airfoil is carried out at a transitional low Reynolds number in the framework of multi-fidelity surrogate modeling. Two multi-fidelity surrogate-based optimization methodologies are proposed. The first method involves the co-Kriging surrogate model with prediction-basedhigh-fidelity model update strategy. The second method uses the Kriging model of the low-fidelity function, and subsequent co-Kriging modeling with high-fidelity infills done using the gradient-free trust-region approach. The high-fidelity solutions are obtained by solving the Reynolds-averaged Navier-Stokes equations with the flow transition modeled by the γ-Reθ model. The low-fidelity solutions are obtained by a panel code in conjunction with the eN method. The proposed optimization methodologies are applied to two different objective functions in the transitional low Reynolds number regime, namely, (i) maximization of lift coefficient, and (ii) maximization of endurance factor. Significant improvements in each of the objective functions are obtained using both thesemethodologies.

    • Author Affiliations



      1. Department of Aerospace Engineering, Faculty of Engineering and Technology, M S Ramaiah University of Applied Sciences, Bangalore 560 058, India
    • Dates

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