An adjoint-based aerodynamic shape optimization framework for natural laminar flows is developed. The laminar to turbulent-transition onset is predicted by the correlation-based Bas–Cakmakcioglu transition model that is coupled with the Spalart–Allmaras turbulence model. A discrete adjoint implementation is subsequently developed. Automatic differentiation is utilized to construct the partial derivatives in the discrete adjoint formulation. The turbulence and transition models are fully coupled into the sensitivity derivative evaluations, as well as into the objective function evaluations. The sensitivity derivatives evaluated by the discrete adjoint solver are validated against those of the finite central difference method. The discrete adjoint-based aerodynamic shape optimization framework developed for natural laminar flows is successfully employed to optimize aerodynamic characteristics of the NLF(1)-0416 airfoil and a low-aspect-ratio wing.


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    Title :

    Discrete Adjoint-Based Aerodynamic Shape Optimization Framework for Natural Laminar Flows


    Contributors:

    Published in:

    AIAA Journal ; 60 , 1 ; 197-212


    Publication date :

    2021-09-30


    Size :

    16 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English








    Aerodynamic Shape Optimization Using the Discrete Adjoint Method

    Nemec, M. / Zingg, D. W. / Canadian Aeronautics and Space Institute | British Library Conference Proceedings | 2001