A simple recipe for selecting evanescent plane wave bases substantially reduces instabilities in Trefftz methods for the Helmholtz equation and improves UWVF performance.
Trefftz, Ein Gegenstuck zum Ritzschen Verfahren,Proceedings of the 2nd Inter- national Congress for Applied Mechanics, Zurich (1926), 131–137
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Trefftz methods with evanescent plane waves
A simple recipe for selecting evanescent plane wave bases substantially reduces instabilities in Trefftz methods for the Helmholtz equation and improves UWVF performance.