Exploring multi-stage shape optimization strategy of multi-body geometries using Kriging-based model and adjoint method

Cited 6 time in Web of Science Cited 14 time in Scopus

Yim, JinWoo; Lee, Byung Joon; Kim, Chongam

Issue Date
COMPUTERS & FLUIDS Vol.68, pp. 71-87
공학Aerodynamic shape optimizationDiscrete adjoint methodKriging modelExpected Improvement
This paper deals with an efficient and high-fidelity design strategy for wing-body configuration. According
to the nature of the design space and the number of design variables, aerodynamic shape optimization
is carried out at each design stage by using a selective optimization strategy. In the first stage, global
optimization techniques are applied to wing planform design with a few geometric design variables. In
the second stage, local optimization techniques are employed to wing surface design with many design
variables, which can maintain a sufficient design space with a high Degree of Freedom (DOF) geometric
change. For global optimization, the Kriging method in conjunction with a Genetic Algorithm (GA) is
used. A searching algorithm exploiting Expected Improvement (EI) design points is introduced to efficiently
enhance the quality of the initial Kriging model for the wing planform design. For local optimization,
a discrete adjoint method is adopted to obtain sensitivity information by fully hand-differentiating
the three-dimensional Euler and N.S equations on an overset mesh topology. By the successive use of the
global and local optimization methods, the drag of a multi-body aircraft configuration can be minimized
for inviscid and viscous flow conditions while the baseline lift and wing weight are maintained. Throughout
the design process, the performances of the test models are improved, compared to those with the
single stage design approach. The performance of the proposed multi-stage design framework is evaluated
by the drag decomposition method.
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College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Mechanical Aerospace Engineering (기계항공공학부)Journal Papers (저널논문_기계항공공학부)
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