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• W3112570415 abstract "Solving time-harmonic wave propagation problems in the frequency domain and within heterogeneous media brings many mathematical and computational challenges, especially in the high frequency regime. We will focus here on computational challenges and try to identify the best algorithm and numerical strategy for a few well-known benchmark cases arising in applications. The aim is to cover, through numerical experimentation and consideration of the best implementation strategies, the main two-level domain decomposition methods developed in recent years for the Helmholtz equation. The theory for these methods is either out of reach with standard mathematical tools or does not cover all cases of practical interest. More precisely, we will focus on the comparison of three coarse spaces that yield two-level methods: the grid coarse space, DtN coarse space, and GenEO coarse space. We will show that they display different pros and cons, and properties depending on the problem and particular numerical setting." @default.
• W3112570415 created "2020-12-21" @default.
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• W3112570415 date "2021-09-01" @default.
• W3112570415 modified "2023-10-09" @default.
• W3112570415 title "A comparison of coarse spaces for Helmholtz problems in the high frequency regime" @default.
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• W3112570415 doi "https://doi.org/10.1016/j.camwa.2021.07.011" @default.
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