A Reduced Order Approach for the Embedded Shifted Boundary FEM and a Heat Exchange System on Parametrized Geometries
Autor: | Guglielmo Scovazzi, Gianluigi Rozza, Giovanni Stabile, Efthymios N. Karatzas, Nabil M. Atallah |
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Jazyk: | angličtina |
Předmět: |
Model order reduction
Discretization Computer science Mathematical analysis Immersed/embedded finite element method Reduced order modeling Unfitted mesh Boundary (topology) 010103 numerical & computational mathematics 01 natural sciences Domain (mathematical analysis) Finite element method 010101 applied mathematics Reduced basis methods Shifted boundary method Settore MAT/08 - Analisi Numerica Settore ICAR/08 - Scienza delle Costruzioni Boundary value problem 0101 mathematics Boundary element method Parametric statistics |
Zdroj: | IUTAM Bookseries IUTAM Bookseries-IUTAM Symposium on Model Order Reduction of Coupled Systems, Stuttgart, Germany, May 22–25, 2018 IUTAM Symposium on Model Order Reduction of Coupled Systems, Stuttgart, Germany, May 22–25, 2018 ISBN: 9783030210120 IUTAM Symposium on Model Order Reduction of Coupled Systems, Stuttgart, Germany, May 22–25, 2018-MORCOS 2018 |
ISSN: | 1875-3507 1875-3493 |
DOI: | 10.1007/978-3-030-21013-7_8 |
Popis: | A model order reduction technique is combined with an embedded boundary finite element method with a POD-Galerkin strategy. The proposed methodology is applied to parametrized heat transfer problems and we rely on a sufficiently refined shape-regular background mesh to account for parametrized geometries. In particular, the employed embedded boundary element method is the Shifted Boundary Method (SBM), recently proposed in Main and Scovazzi, J Comput Phys [17]. This approach is based on the idea of shifting the location of true boundary conditions to a surrogate boundary, with the goal of avoiding cut cells near the boundary of the computational domain. This combination of methodologies has multiple advantages. In the first place, since the Shifted Boundary Method always relies on the same background mesh, there is no need to update the discretized parametric domain. Secondly, we avoid the treatment of cut cell elements, which usually need particular attention. Thirdly, since the whole background mesh is considered in the reduced basis construction, the SBM allows for a smooth transition of the reduced modes across the immersed domain boundary. The performances of the method are verified in two dimensional heat transfer numerical examples. |
Databáze: | OpenAIRE |
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