On differentiable local bounds preserving stabilization for Euler equations

Santiago Badia, Jesús Bonilla, Sibusiso Mabuza, John N. Shadid

Research output: Contribution to journalArticleResearchpeer-review

Abstract

This work presents the design of nonlinear stabilization techniques for the finite element discretization of Euler equations in both steady and transient form. Implicit time integration is used in the case of the transient form. A differentiable local bounds preserving method has been developed, which combines a Rusanov artificial diffusion operator and a differentiable shock detector. Nonlinear stabilization schemes are usually stiff and highly nonlinear. This issue is mitigated by the differentiability properties of the proposed method. Moreover, in order to further improve the nonlinear convergence, we also propose a continuation method for a subset of the stabilization parameters. The resulting method has been successfully applied to steady and transient problems with complex shock patterns. Numerical experiments show that it is able to provide sharp and well resolved shocks. The importance of the differentiability is assessed by comparing the new scheme with its non-differentiable counterpart. Numerical experiments suggest that, for up to moderate nonlinear tolerances, the method exhibits improved robustness and nonlinear convergence behavior for steady problems. In the case of transient problem, we also observe a reduction in the computational cost.

Original languageEnglish
Article number113267
Number of pages22
JournalComputer Methods in Applied Mechanics and Engineering
Volume370
DOIs
Publication statusPublished - 1 Oct 2020

Keywords

  • Euler equations
  • Hyperbolic systems
  • Positivity preservation
  • Shock capturing

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