In a large reproducible benchmark of two-level domain-decomposition solvers for the heterogeneous Helmholtz equation, harmonic and extended-harmonic spectral coarse spaces outperform DtN and Hk-GenEO in iteration count and size, especially in 3D.
Can DtN and GenEO Coarse Spaces Be Sufficiently Robust for Heteroge- neous Helmholtz Problems?
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Achieving wavenumber robustness in domain decomposition for heterogeneous Helmholtz equation: an overview of spectral coarse spaces
In a large reproducible benchmark of two-level domain-decomposition solvers for the heterogeneous Helmholtz equation, harmonic and extended-harmonic spectral coarse spaces outperform DtN and Hk-GenEO in iteration count and size, especially in 3D.