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Numerical Upscaling via the Wave Equation with Perfectly Matched Layers
Mälardalens universitet, Akademin för utbildning, kultur och kommunikation, Utbildningsvetenskap och Matematik.ORCID-id: 0000-0003-4481-0964
2022 (Engelska)Ingår i: Springer Proc. Math. Stat., Springer Nature , 2022, s. 689-702Konferensbidrag, Publicerat paper (Refereegranskat)
Abstract [en]

One of the main ingredients of existing multiscale numerical methods for homogenization problems is an accurate description of the coarse scale quantities, e.g., the homogenized coefficient via local microscopic computations. Typical multiscale frameworks use local problems that suffer from the so-called resonance or cell-boundary error, dominating the all other errors in multiscale computations. Previously, the second order wave equation was used as a local problem to eliminate such an error. Although this approach eliminates the resonance error totally, the computational cost of the method is known to increase with increasing wave speed. In this paper, the possibility of integrating perfectly matched layers to the local wave equation is explored. In particular, questions in relation with accuracy and reduced computational costs are addressed. Numerical simulations are provided in a simplified one-dimensional setting to illustrate the ideas.

Ort, förlag, år, upplaga, sidor
Springer Nature , 2022. s. 689-702
Serie
Springer Proceedings in Mathematics & Statistics, ISSN 2194-1009
Nyckelord [en]
Homogenization, Wave equation, Errors, Numerical methods, Boundary errors, Cell boundary, Computational costs, Homogenization problems, Local problems, Multiscale computation, Multiscale framework, Perfectly Matched Layer, Upscaling, Wave equations
Nationell ämneskategori
Beräkningsmatematik
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URN: urn:nbn:se:mdh:diva-64450DOI: 10.1007/978-3-031-17820-7_30Scopus ID: 2-s2.0-85171555617ISBN: 9783031178207 (tryckt)OAI: oai:DiVA.org:mdh-64450DiVA, id: diva2:1802629
Konferens
Springer Proceedings in Mathematics and Statistics
Tillgänglig från: 2023-10-05 Skapad: 2023-10-05 Senast uppdaterad: 2026-02-27Bibliografiskt granskad

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Arjmand, Doghonay

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