Artículo
Low-rank approximations for parametric non-symmetric elliptic problems
Autor/es | Chacón Rebollo, Tomás
Gómez Mármol, María Macarena Sánchez Muñoz, Isabel María |
Departamento | Universidad de Sevilla. Departamento de Ecuaciones Diferenciales y Análisis Numérico Universidad de Sevilla. Departamento de Matemática Aplicada I (ETSII) |
Fecha de publicación | 2022-05-10 |
Fecha de depósito | 2024-04-05 |
Publicado en |
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Resumen | In this study, we obtained low-rank approximations for the solution of parametric non-symmetric elliptic partial differential equations. We proved the existence of optimal approximation subspaces that minimize the error ... In this study, we obtained low-rank approximations for the solution of parametric non-symmetric elliptic partial differential equations. We proved the existence of optimal approximation subspaces that minimize the error between the solution and an approximation on this subspace, with respect to the mean parametric quadratic norm associated with any preset norm in the space of solutions. Using a low-rank tensorized decomposition, we built an expansion of approximating solutions with summands on finite-dimensional optimal subspaces and proved the strong convergence of the truncated expansion. For rank-one approximations, similar to the PGD expansion, we proved the linear convergence of the power iteration method to compute the modes of the series for data small enough. We presented some numerical results in good agreement with this theoretical analysis. |
Identificador del proyecto | US-1254587
RTI2018- 093521-B-C31 |
Cita | Chacón Rebollo, T., Gómez Mármol, M.M. y Sánchez Muñoz, I.M. (2022). Low-rank approximations for parametric non-symmetric elliptic problems. Frontiers in Physics, 10 (869681). https://doi.org/10.3389/fphy.2022.869681. |
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