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Multi-stage Design Approach for High Fidelity Aerodynamic Optimization of Multi-body Geometries by Kriging Based Models and Adjoint Variable Method

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Authors
Yim, JinWoo; Lee, ByungJoon; Kim, Chongam
Issue Date
2010-06
Publisher
ECCOMAS
Citation
V European Conference on Computational Fluid Dynamics, ECCOMAS CFD 2010, pp. 1-20.
Keywords
공학Aerodynamic Shape optimizationGAKrigingAdjoint Variable Method
Abstract
An efficient and high-fidelity design approach for wing-body configuration is
presented. Depending on the size of design space and the number of design of variable,
aerodynamic shape optimization is carried out via selective optimization strategy at
each design stage. In the first stage, global optimization techniques are applied to
planform design with a few geometric design variables. In the second stage, local
optimization techniques are employed for wing surface design with a lot of design
variables which can maintain a sufficient design space with a high DOF (Degree of
Freedom) geometric change. For global optimization, Kriging method in conjunction
with GA (Genetic Algorithm) is used. A searching algorithm of EI (Expected
Improvement) points is introduced to enhance the quality of global optimization for the
wing-planform design. For local optimization, a discrete adjoint method is adopted, and
adjoint numerical dissipation is introduced to improve convergence behavior of the
adjoint solver. By the successive combination of global and local optimization
techniques, drag minimization is performed for a multi-body aircraft configuration in
inviscid and viscous flow conditions while maintaining the baseline lift and the wing
weight. Through the design process, performances of the test models are remarkably
improved in comparison with the single stage design approach. The performance of the
proposed design framework including wing planform design variables can be efficiently
evaluated by the drag decomposition method, which can examine the improvement of
various drag components, such as induced drag, wave drag and viscous drag
Language
English
URI
https://hdl.handle.net/10371/82422
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College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Mechanical Aerospace Engineering (기계항공공학부)Others_기계항공공학부
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