A Discrete Adjoint Solver for Time-Domain Fluid-Structure Interaction Problems with Large Deformations

Venkatesan-Crome, Charanya; Palacios, Rafael

doi:10.2514/6.2020-0406

Cited by 3 publications

(2 citation statements)

References 20 publications

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“…Coupling these together, namely full 3D finite element models (FEM) with boundary-layer resolving computational fluid dynamics (CFD) solvers is not a trivial procedure and computationally demanding problem. Thus, usually, for high aspect ratio aircraft the first simplifying assumption comes on the structural side, employing one-dimensional beam models for slender wings which can be more easily coupled with the aerodynamic model [6,7]. Beam models capable of capturing the nonlinear effects resulting from large deformations and finite rotations are now standard use in aeroelasticity, with several models for geometrically exact beam formulations available, notably intrinsic [8], displacement-based [9], or strain-based [10], but also others such as the modal rotation method [11,12].…”

Section: A Low Speed Aeroelasticitymentioning

confidence: 99%

Adaptive Sampling for Interpolation of Reduced-Order Aeroelastic Systems

2022

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A new strategy for the interpolation of parametric reduced-order models of dynamic aeroelastic systems is introduced. Its aim is to accelerate the numerical exploration of geometrically-nonlinear aeroelastic systems over large design spaces or multiple flight conditions. The parametric reduced-order models are obtained from high-dimensional models by Krylov subspace projection. They are subsequently interpolated to acquire realizations inexpensively anywhere in the parameter space, where having the state-space as opposed to interpolating an output metric permits the use of linear analysis tools. The interpolation scheme is heavily conditioned by the available training points, thus a novel methodology based on adaptive sampling and a combinatorial use of the available true-systems knowledge is presented, whereby we reuse all known data of the true models as different combinations of training and testing data to build statistical surrogates of the interpolation error across the parameter space and refine the sampling in those regions that need it. This minimizes the number of costly-to-evaluate functions calls and ensures that parameter space regions are sampled according to the underlying system dynamics. The initial implementation of this adaptive sampling strategy is demonstrated on a very flexible wing with a complex stability envelope.

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Section: A Low Speed Aeroelasticitymentioning

confidence: 99%

Adaptive Sampling for Interpolation of Reduced-Order Aeroelastic Systems

2022

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“…In addition to the results of steady state simulations, validated gradients for a simple unsteady CHT setup using the discrete adjoint method are implemented and available. The unsteady multizone adjoint requires additional care [2] in terms of implementation and especially objective function definition.…”

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confidence: 99%

Adjoint-Based Shape Optimization for Industrial Heat Exchangers

Kattmann¹,

Burghardt²,

Gauger³

et al. 2022

15th World Congress on Computational Mechanics (WCCM-XV) and 8th Asian Pacific Congress on Computational Mechanics (APCOM-VIII)

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Power electronics as used in electric cars derate their performance above certain temperatures, if not sufficiently cooled. Residential gas/hydrogen boilers require careful design for optimal efficiency and minimal emissions. In both application fields, a free-shape optimized design of the heat exchanger and surrounding components promises substantial performance gains that are relevant to fulfil the regulator's and customer demands.

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Adjoint-based Aerodynamic Optimization of a Side-view Mirror

Carvalho

Silva

2021

AIAA Scitech 2021 Forum

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A Discrete Adjoint Solver for Time-Domain Fluid-Structure Interaction Problems with Large Deformations

Cited by 3 publications

References 20 publications

Adaptive Sampling for Interpolation of Reduced-Order Aeroelastic Systems

Adaptive Sampling for Interpolation of Reduced-Order Aeroelastic Systems

Adjoint-Based Shape Optimization for Industrial Heat Exchangers

Adjoint-based Aerodynamic Optimization of a Side-view Mirror

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