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Coupling of finite element and plane waves discontinuous Galerkin methods for time-harmonic problems
University of Le Mans.ORCID iD: 0000-0001-9071-6325
Université du Maine, Le Mans France. (LAUM)
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Marcus Wallenberg Laboratory MWL. Centre for ECO2 Vehicle Design.ORCID iD: 0000-0003-1855-5437
University of Le Mans.
2018 (English)In: International Journal for Numerical Methods in Engineering, ISSN 0029-5981, E-ISSN 1097-0207, Vol. 116, no 7, p. 487-503Article in journal (Refereed) Published
Abstract [en]

A coupling approach is presented to combine a wave-based method to the standard finite element method. This coupling methodology is presented here for the Helmholtz equation but it can be applied to a wide range of wave propagation problems. While wave-based methods can significantly reduce the computational cost, especially at high frequencies, their efficiency is hampered by the need to use small elements to resolve complex geometric features. This can be alleviated by using a standard finite element model close to the surfaces to model geometric details and create large, simply-shaped areas to model with a wave-based method. This strategy is formulated and validated in this paper for the wave-based discontinuous Galerkin method together with the standard finite element method. The coupling is formulated without using Lagrange multipliers and results demonstrate that the coupling is optimal in that the convergence rates of the individual methods are maintained.

Place, publisher, year, edition, pages
John Wiley & Sons, 2018. Vol. 116, no 7, p. 487-503
National Category
Applied Mechanics
Identifiers
URN: urn:nbn:se:kth:diva-239305DOI: 10.1002/nme.5933ISI: 000446988200003Scopus ID: 2-s2.0-85052440540OAI: oai:DiVA.org:kth-239305DiVA, id: diva2:1264286
Note

QC 20181120

Available from: 2018-11-19 Created: 2018-11-19 Last updated: 2018-12-11Bibliographically approved

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Göransson, Peter

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