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Application of generic algorithms in aerodynamic optimisation design procedures

Published online by Cambridge University Press:  03 February 2016

R. P. Clayton  and
R. F. Martinez-Botas
R. P. Clayton
Affiliation:
Department of Mechanical Engineering, Imperial College London, London, UK
R. F. Martinez-Botas
Affiliation:
Department of Mechanical Engineering, Imperial College London, London, UK
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Abstract

Direct optimisation techniques using different methods are presented and compared for the solution of two common flows: a two dimensional diffuser and a drag minimisation problem of a fixed area body. The methods studied are a truncated Newton algorithm (gradient method), a simplex approach (direct search method) and a genetic algorithm (stochastic method). The diffuser problem has a known solution supported by experimental data, it has one design performance measure (the pressure coefficient) and two design variables. The fixed area body also has one performance measure (the drag coefficient), but this time there are four design variables; no experimental data is available, this computation is performed to assess the speed/progression of solution.

In all cases the direct search approach (simplex method) required significantly smaller number of evaluations than the generic algorithm method. The simplest approach, the gradient method (Newton) performed equally to the simplex approach for the diffuser problem but it was unable to provide a solution to the four-variable problem of a fixed area body drag minimisation. The level of robustness obtained by the use of generic algorithm is in principle superior to the other methods, but a large price in terms of evaluations has to be paid.

Type
Research Article
Information
The Aeronautical Journal , Volume 108 , Issue 1090 , December 2004 , pp. 611 - 620
Copyright
Copyright © Royal Aeronautical Society 2004 

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