GMRES convergence plateaus near Helmholtz resonances are explained by harmonic Ritz values slowly approximating small eigenvalues, and deflation of the associated modes removes the plateaus.
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Convergence analysis of GMRES applied to Helmholtz problems near resonances
GMRES convergence plateaus near Helmholtz resonances are explained by harmonic Ritz values slowly approximating small eigenvalues, and deflation of the associated modes removes the plateaus.