# Model reduction using $L^1$ -norm minimization as an application to nonlinear hyperbolic problems

Abgrall, Rémi; Crisovan, R (2018). Model reduction using $L^1$ -norm minimization as an application to nonlinear hyperbolic problems. International Journal for Numerical Methods in Fluids, 87(12):628-651.

## Abstract

We are interested in the model reduction techniques for hyperbolic problems, particularly in fluids. This paper, which is a continuation of an earlier paper of Abgrall et al, proposes a dictionary approach coupled with an L1 minimization approach. We develop the method and analyze it in simplified 1‐dimensional cases. We show in this case that error bounds with the full model can be obtained provided that a suitable minimization approach is chosen. The capability of the algorithm is then shown on nonlinear scalar problems, 1‐dimensional unsteady fluid problems, and 2‐dimensional steady compressible problems. A short discussion on the cost of the method is also included in this paper.

## Abstract

We are interested in the model reduction techniques for hyperbolic problems, particularly in fluids. This paper, which is a continuation of an earlier paper of Abgrall et al, proposes a dictionary approach coupled with an L1 minimization approach. We develop the method and analyze it in simplified 1‐dimensional cases. We show in this case that error bounds with the full model can be obtained provided that a suitable minimization approach is chosen. The capability of the algorithm is then shown on nonlinear scalar problems, 1‐dimensional unsteady fluid problems, and 2‐dimensional steady compressible problems. A short discussion on the cost of the method is also included in this paper.

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Item Type: Journal Article, refereed, original work 07 Faculty of Science > Institute of Mathematics 510 Mathematics Physical Sciences > Computational Mechanics Physical Sciences > Mechanics of Materials Physical Sciences > Mechanical Engineering Physical Sciences > Computer Science Applications Physical Sciences > Applied Mathematics Mechanical Engineering, Mechanics of Materials, Applied Mathematics, Computational Mechanics, Computer Science Applications English 1 December 2018 17 Jan 2019 07:29 26 Jan 2022 16:56 Wiley-Blackwell Publishing, Inc. 0271-2091 Closed https://doi.org/10.1002/fld.4507 : FunderSNSF: Grant ID200021_153604: Project TitleHigh fidelity simulation for compressible material

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