Robust and scalable h-adaptive aggregated unfitted finite elements for interface elliptic problems

Eric Neiva, Santiago Badia

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1 Citation (Scopus)

Abstract

This work introduces a novel, fully robust and highly-scalable, h-adaptive aggregated unfitted finite element method for large-scale interface elliptic problems. The new method is based on a recent distributed-memory implementation of the aggregated finite element method atop a highly-scalable Cartesian forest-of-trees mesh engine. It follows the classical approach of weakly coupling nonmatching discretisations at the interface to model internal discontinuities at the interface. We propose a natural extension of a single-domain parallel cell aggregation scheme to problems with a finite number of interfaces; it straightforwardly leads to aggregated finite element spaces that have the structure of a Cartesian product. We demonstrate, through standard numerical analysis and exhaustive numerical experimentation on several complex Poisson and linear elasticity benchmarks, that the new technique enjoys the following properties: well-posedness, robustness with respect to cut location and material contrast, optimal (h-adaptive) approximation properties, high scalability and easy implementation in large-scale finite element codes. As a result, the method offers great potential as a useful finite element solver for large-scale interface problems modelled by partial differential equations.

Original languageEnglish
Article number113769
Number of pages26
JournalComputer Methods in Applied Mechanics and Engineering
Volume380
DOIs
Publication statusPublished - 1 Jul 2021

Keywords

  • Adaptive mesh refinement
  • High performance scientific computing
  • Interface linear elasticity
  • Interface Poisson
  • Unfitted finite elements

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