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φ-FEM: an efficient simulation tool using simple meshes for problems in structure mechanics and heat transfer

Abstract : One of the major issues in the computational mechanics is to take into account the geometrical complexity. To overcome this difficulty and to avoid the expensive mesh generation, geometrically unfitted methods, i.e. the numerical methods using the simple computational meshes that do not fit the boundary of the domain, and/or the internal interfaces, have been widely developed. In the present work, we investigate the performances of an unfitted method called φ-FEM that converges optimally and uses classical finite element spaces so that it can be easily implemented using general FEM libraries. The main idea is to take into account the geometry thanks to a level set function describing the boundary or the interface. Up to now, the φ-FEM approach has been proposed, tested and substantiated mathematically only in some simplest settings: Poisson equation with Dirichlet/Neumann/Robin boundary conditions. Our goal here is to demonstrate its applicability to some more sophisticated governing equations arising in the computational mechanics. We consider the linear elasticity equations accompanied by either pure Dirichlet boundary conditions or by the mixed ones (Dirichlet and Neumann boundary conditios co-existing on parts of the boundary), an interface problem (linear elasticity with material coefficients abruptly changing over an internal interface), a model of elastic structures with cracks, and finally the heat equation. In all these settings, we derive an appropriate variant of φ-FEM and then illustrate it by numerical tests on manufactured solutions. We also compare the accuracy and efficiency of φ-FEM with those of the standard fitted FEM on the meshes of similar size, revealing the substantial gains that can be achieved by φ-FEM in both the accuracy and the computational time.
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https://hal.archives-ouvertes.fr/hal-03372733
Contributor : Michel Duprez Connect in order to contact the contributor
Submitted on : Monday, October 11, 2021 - 9:53:56 AM
Last modification on : Wednesday, June 22, 2022 - 3:34:56 AM
Long-term archiving on: : Wednesday, January 12, 2022 - 7:04:21 PM

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  • HAL Id : hal-03372733, version 1

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Stéphane Cotin, Michel Duprez, Vanessa Lleras, Alexei Lozinski, Killian Vuillemot. φ-FEM: an efficient simulation tool using simple meshes for problems in structure mechanics and heat transfer. Partition of Unity Methods (Wiley Series in Computational Mechanics) 1st Edition, Wiley, 2022, 978-0470667088. ⟨hal-03372733⟩

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