Numerical sensitivity analysis for aerodynamic optimization: A survey of approaches

Peter, Jacques; Dwight, Richard P.

doi:10.1016/j.compfluid.2009.09.013

Cited by 226 publications

(121 citation statements)

References 107 publications

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“…AD has seen a diverse range of successful practical applications, including for example in engineering design [38,39] and large-scale ocean state estimation [40,41]. However, the black-box line-by-line application of AD without any consideration of the mathematical structure of the problem can be too inefficient for practical use [42]. In addition the implementation of an adjoint model is significantly hampered by the need to access forward model data in the reverse order to which it was computed, necessitating the use of data checkpointing and recovery strategies.…”

Section: Adjoint Modelsmentioning

confidence: 99%

Rapid development and adjoining of transient finite element models

Maddison

Farrell

2014

Computer Methods in Applied Mechanics and Engineering

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Recent advances in high level finite element systems have allowed for the symbolic representation of discretisations and their efficient automated implementation as model source code. This allows for the extremely compact implementation of complex non-linear models in a handful of lines of high level code. In this work we extend the high level finite element FEniCS system to introduce an abstract representation of the temporal discretisation: this enables the similarly rapid development of transient finite element models. Efficiency is achieved via aggressive optimisations that exploit the temporal structure, such as automated pre-assembly and caching of forms, and the robust re-use of matrix factorisations and preconditioner data. The resulting models are as fast or faster than hand-optimised finite element codes. The high level representation of the system remains extremely compact and easily manipulated. This structure is exploited to derive the associated discrete adjoint model automatically, with the adjoint model inheriting the performance advantages of the forward model. Combined, this provides a system for the rapid development of efficient transient models, together with their discrete adjoints.

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Section: Adjoint Modelsmentioning

confidence: 99%

Rapid development and adjoining of transient finite element models

Maddison

Farrell

2014

Computer Methods in Applied Mechanics and Engineering

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“…However, the exact linearization of all terms in the discrete residual is quite complex, laborious and might be often prone to errors. To simplify this tedious effort and ease the development of the adjoint solvers, various Jacobian approximations [18] have been proposed in the past. In these approximations, linearization of certain terms in the flux Jacobian is omitted.…”

Section: Introductionmentioning

confidence: 99%

A Two-Level Hybrid Approach for Optimal Active Flow Control on a Three-Element Airfoil

Nemili¹,

Özkaya²,

Gauger³

et al. 2016

Proceedings of the VII European Congress on Computational Methods in Applied Sciences and Engineering (ECCOMAS Congress 2016)

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Abstract. In this paper we present a two-level approach that combines an adjoint-based gradient search method with an evolutionary algorithm for optimal active flow control. The suggested method effectively combines the advantages of both approaches and achieves a good compromise between the computational effort and the degree of freedom used in optimization. In the first level, a global optimization is performed with few design parameters using an evolutionary algorithm. In the second level, the global optimal solution from the first level is taken as the initial setting for the adjoint based local optimization using a large number of design parameters. The unsteady discrete adjoint solver required for the second level is developed based on Algorithmic Differentiation techniques for the unsteady incompressible flowsgoverned by Unsteady Reynolds-Averaged Navier Stokes (URANS) equations. In this way, the discrete adjoint solver is robust and has exactly the same functionality with the underlying URANS flow solver. The applicability of the two-level method is demonstrated by finding the optimal parameters of the active flow control mechanism on a three element airfoil configuration at a Reynolds number of Re = 10 6 and an angle of attack of AoA = 6 • . Numerical results have shown that the hybrid approach completely suppressed the separation and very significantly increased the mean-lift coefficient by 67% compared to the un-actuated baseline flow.

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“…In addition to the 17 references [4][5][6][7]11,12,16,[18][19][20][21][22][23][24][25]28,29] based on elsA in peerreviewed journals, the following list (alphabetically by the first author) gathers nearly 100 other papers dealing with elsA in such journals. This list is again a demonstration of cooperative work about elsA since the co-authors often belong to several research labs, or to both research laboratories and industry.…”

Section: Appendixmentioning

confidence: 99%

“…elsA also includes an "aeroelasticity module" [16,17] offering a framework for aeroelastic simulations and an "optimization module" for calculation of sensitivities by linearized equation solution or by adjoint solver techniques [18,19].…”

Section: General Description Of Elsamentioning

confidence: 99%

The OneraelsACFD software: input from research and feedback from industry

Cambier

Heib

Plot

2013

Mechanics & Industry

393

249

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-The Onera elsA CFD software is both a software package capitalizing the innovative results of research over time and a multi-purpose tool for applied CFD and multi-physics. The research input from Onera and other laboratories and the feedback from aeronautical industry users allow enhancement of its capabilities and continuous improvement. The paper presents recent accomplishments of varying complexity from research and industry for a wide range of aerospace applications: aircraft, helicopters, turbomachinery...

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Numerical sensitivity analysis for aerodynamic optimization: A survey of approaches

Cited by 226 publications

References 107 publications

Rapid development and adjoining of transient finite element models

Rapid development and adjoining of transient finite element models

A Two-Level Hybrid Approach for Optimal Active Flow Control on a Three-Element Airfoil

The OneraelsACFD software: input from research and feedback from industry

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