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Thanks to a finite element method, we solve numerically parabolic partial differential equations on complex domains by avoiding the mesh generation, using a regular background mesh, not fitting the domain and its real boundary exactly. Our technique follows the -FEM paradigm, which supposes that the domain is given by a level-set function. In this paper, we prove a priori error estimates in and norms for an implicit Euler discretization in time. We give numerical illustrations to highlight the performances of -FEM, which combines optimal convergence accuracy, easy implementation process and fastness.
Duprez, Michel 1 ; Lleras, Vanessa 2 ; Lozinski, Alexei 3 ; Vuillemot, Killian 1, 2
@article{CRMATH_2023__361_G11_1699_0, author = {Duprez, Michel and Lleras, Vanessa and Lozinski, Alexei and Vuillemot, Killian}, title = {$\phi ${-FEM} for the heat equation: optimal convergence on unfitted meshes in space}, journal = {Comptes Rendus. Math\'ematique}, pages = {1699--1710}, publisher = {Acad\'emie des sciences, Paris}, volume = {361}, number = {G11}, year = {2023}, doi = {10.5802/crmath.497}, language = {en}, url = {http://geodesic.mathdoc.fr/articles/10.5802/crmath.497/} }
TY - JOUR AU - Duprez, Michel AU - Lleras, Vanessa AU - Lozinski, Alexei AU - Vuillemot, Killian TI - $\phi $-FEM for the heat equation: optimal convergence on unfitted meshes in space JO - Comptes Rendus. Mathématique PY - 2023 SP - 1699 EP - 1710 VL - 361 IS - G11 PB - Académie des sciences, Paris UR - http://geodesic.mathdoc.fr/articles/10.5802/crmath.497/ DO - 10.5802/crmath.497 LA - en ID - CRMATH_2023__361_G11_1699_0 ER -
%0 Journal Article %A Duprez, Michel %A Lleras, Vanessa %A Lozinski, Alexei %A Vuillemot, Killian %T $\phi $-FEM for the heat equation: optimal convergence on unfitted meshes in space %J Comptes Rendus. Mathématique %D 2023 %P 1699-1710 %V 361 %N G11 %I Académie des sciences, Paris %U http://geodesic.mathdoc.fr/articles/10.5802/crmath.497/ %R 10.5802/crmath.497 %G en %F CRMATH_2023__361_G11_1699_0
Duprez, Michel; Lleras, Vanessa; Lozinski, Alexei; Vuillemot, Killian. $\phi $-FEM for the heat equation: optimal convergence on unfitted meshes in space. Comptes Rendus. Mathématique, Tome 361 (2023) no. G11, pp. 1699-1710. doi: 10.5802/crmath.497
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