Optimisation of Multi-Modal Aerodynamic Shape and Topology Problems

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Abstract

This paper presents further results on the development of a combined multi-fidelity shape and topology optimisation framework for aerodynamic optimisation. The combined framework comprises: a multilevel subdivision shape parameterisation used in combination with an adjoint solver and gradient-based optimiser for robust high-fidelity local shape optimisation; and a restricted snake volume of solid parameterisation and differential evolution search algorithm for flexible coverage of a global topological design space. Previous work has demonstrated the efficacy of extending a topological design space by including an efficient local shape optimisation, and the challenges which need to be addressed to do so. Importantly, the work has incorporated the two approaches such that the geometric flexibility of the restricted snake volume of solid method in representing arbitrary topology, has been combined with the efficient and high fidelity precision provided by local shape optimisation. As a result significant performance enhancements have been brought to the topology optimisation problem. The combined framework is benchmarked on a challenging constrained supersonic drag minimisation problem exhibiting multi-body solutions, discontinuities and multi-modality, and significant improvements are demonstrated compared to the individual local and global methods applied separately. In this paper, test cases with additional topological complexity are tackled with focus given to the multi-modality of the aerodynamic objective in the combined shape and topology design space.

Original languageEnglish
Title of host publicationAIAA Scitech 2019 Forum
Subtitle of host publication7-11 January 2019, San Diego, California
PublisherAmerican Institute of Aeronautics and Astronautics Inc. (AIAA)
Number of pages23
ISBN (Print)9781624105784
DOIs
Publication statusPublished - 6 Jan 2019
EventAIAA Scitech Forum, 2019 - San Diego, United States
Duration: 7 Jan 201911 Jan 2019
https://scitech.aiaa.org/

Publication series

NameAIAA Scitech 2019 Forum

Conference

ConferenceAIAA Scitech Forum, 2019
Country/TerritoryUnited States
CitySan Diego
Period7/01/1911/01/19
Internet address

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