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논문 기본 정보
- 자료유형
- 학술대회자료
- 저자정보
- 발행연도
- 2008.5
- 수록면
- 46 - 49 (4page)
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초록· 키워드
오류제보하기
Two independent approaches of enhancing adjoint design methods are presented in the paper. First, enhancing the Euler adjoint methods have been achieved by optimizing the adjoint parameters using a non-linear gradient-based optimization package, SNOPT. The Euler adjoint parameters include the coefficients of the residual smoothing scheme, the CFL numbers of the Euler and adjoint solutions, the implicit gradient smoothing coefficient, and the step size of the steepest descent method. The numerical results showed the feasibility of integration of the SNOPT package and the adjoint software in order to speed-up, improve and stabilize the performance of the design methods. Second, the paper presents a reduced adjoint gradient method using the both Euler and Navier-Stokes equations which reduces the computational cost of the gradients by transforming the volume integral part of the adjoint gradient formula into a surface integral. The savings are particularly significant for three-dimensional aerodynamic shape optimization problems. To validate the concept, the reduced gradient equations have been tested for various aerodynamic shape-optimization problems using the Euler equations.
목차
ABSTRACT
INTRODUCTION
PARAMETER OPTIMIZATION
REDUCTION OF THE ADJOINT GRADIENT FORMULA
CONCLUSION
ACKOWLEDGEMENT
REFERENCES
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UCI(KEPA) : I410-ECN-0101-2009-410-011286587