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Sensitivity assessment of optimal solution in aerodynamic design optimisation using SU2

Sensitivity assessment of optimal solution in aerodynamic design optimisation using SU2
Sensitivity assessment of optimal solution in aerodynamic design optimisation using SU2
Computational fluid dynamics has become the method of choice for aerodynamic shape optimisation of complex engineering problems. However, the sensitivity of the final aerodynamic shape to numerical parameters has been largely underestimated to date. The purpose of this work is to investigate the influence that numerical parameters have on the optimisation results for two aerofoil problems (NACA 0012 and RAE 2822) in transonic flow, and to provide compact guidelines for best practice. Numerical parameters include: a) two parameterisation methods, Hicks-Henne bump functions and free{form deformation; b) numerical settings related to the tuning of each parameterisation method; and c) closure coefficients of Spalart-Allmaras (SA) turbulence model. All optimisations were performed using the open{source software tool SU2, and gradients were computed using the continuous adjoint method. It was found that: a) the optimisation result of NACA 0012 aerofoil exhibits strong dependence onall numerical parameters investigated, whereas the optimal design of RAE 2822 aerofoil is insensitive to those numerical settings; b) the degree of sensitivity reflects the difference in the design space, particularly of the local curvature on the optimised shape; c) the closure coefficients of SA model affect the final optimisation performance, raising the need for a good calibration of the turbulence model.
aerodynamic shape optimisation, SU2, Uncertainty, gradient optimisation, Hicks-Henne bump functions, free-form deformation
1270-9638
362-374
Yang, Guangda
619bb9c3-57bb-4ee3-8dd7-6504e814aea3
Da Ronch, Andrea
a2f36b97-b881-44e9-8a78-dd76fdf82f1a
Drofelnik, Jernej
e785f695-61ef-4afc-bf0a-9dc7966f5516
Xie, Zheng-Tong
98ced75d-5617-4c2d-b20f-7038c54f4ff0
Yang, Guangda
619bb9c3-57bb-4ee3-8dd7-6504e814aea3
Da Ronch, Andrea
a2f36b97-b881-44e9-8a78-dd76fdf82f1a
Drofelnik, Jernej
e785f695-61ef-4afc-bf0a-9dc7966f5516
Xie, Zheng-Tong
98ced75d-5617-4c2d-b20f-7038c54f4ff0

Yang, Guangda, Da Ronch, Andrea, Drofelnik, Jernej and Xie, Zheng-Tong (2018) Sensitivity assessment of optimal solution in aerodynamic design optimisation using SU2. Aerospace Science and Technology, 81, 362-374. (doi:10.1016/j.ast.2018.08.012).

Record type: Article

Abstract

Computational fluid dynamics has become the method of choice for aerodynamic shape optimisation of complex engineering problems. However, the sensitivity of the final aerodynamic shape to numerical parameters has been largely underestimated to date. The purpose of this work is to investigate the influence that numerical parameters have on the optimisation results for two aerofoil problems (NACA 0012 and RAE 2822) in transonic flow, and to provide compact guidelines for best practice. Numerical parameters include: a) two parameterisation methods, Hicks-Henne bump functions and free{form deformation; b) numerical settings related to the tuning of each parameterisation method; and c) closure coefficients of Spalart-Allmaras (SA) turbulence model. All optimisations were performed using the open{source software tool SU2, and gradients were computed using the continuous adjoint method. It was found that: a) the optimisation result of NACA 0012 aerofoil exhibits strong dependence onall numerical parameters investigated, whereas the optimal design of RAE 2822 aerofoil is insensitive to those numerical settings; b) the degree of sensitivity reflects the difference in the design space, particularly of the local curvature on the optimised shape; c) the closure coefficients of SA model affect the final optimisation performance, raising the need for a good calibration of the turbulence model.

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Accepted/In Press date: 10 August 2018
e-pub ahead of print date: 17 August 2018
Published date: October 2018
Keywords: aerodynamic shape optimisation, SU2, Uncertainty, gradient optimisation, Hicks-Henne bump functions, free-form deformation

Identifiers

Local EPrints ID: 423876
URI: http://eprints.soton.ac.uk/id/eprint/423876
ISSN: 1270-9638
PURE UUID: 52655aaa-702d-45b2-b360-18656aaabf62
ORCID for Guangda Yang: ORCID iD orcid.org/0000-0002-8029-8518
ORCID for Zheng-Tong Xie: ORCID iD orcid.org/0000-0002-8119-7532

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Date deposited: 03 Oct 2018 16:30
Last modified: 17 Dec 2019 05:15

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