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Improving the efficiency of aerodynamic shape optimization proceduresThe computational efficiency of an aerodynamic shape optimization procedure which is based on discrete sensitivity analysis is increased through the implementation of two improvements. The first improvement involves replacing a grid point-based approach for surface representation with a Bezier-Bernstein polynomial parameterization of the surface. Explicit analytical expressions for the grid sensitivity terms are developed for both approaches. The second improvement proposes the use of Newton's method in lieu of an alternating direction implicit (ADI) methodology to calculate the highly converged flow solutions which are required to compute the sensitivity coefficients. The modified design procedure is demonstrated by optimizing the shape of an internal-external nozzle configuration. A substantial factor of 8 decrease in computational time for the optimization process was achieved by implementing both of the design improvements.
Document ID
19930036312
Document Type
Conference Paper
Authors
Burgreen, Greg W. (NASA Langley Research Center Hampton, VA, United States)
Baysal, Oktay (NASA Langley Research Center Hampton, VA, United States)
Eleshaky, Mohamed E. (Old Dominion Univ. Norfolk, VA, United States)
Date Acquired
August 15, 2013
Publication Date
January 1, 1992
Publication Information
Publication: In: AIAA(USAF)NASA/OAI Symposium on Multidisciplinary Analysis and Optimization, 4th, Cleveland, OH, Sept. 21-23, 1992, Technical Papers. Pt. 1 (A93-20301 06-66)
Subject Category
AERODYNAMICS
Report/Patent Number
AIAA PAPER 92-4697
Funding Number(s)
CONTRACT_GRANT: NAG1-1188
Distribution Limits
Public
Copyright
Other