MFWH computes several Helmholtz solutions simultaneously from one wave-equation solve using multiple time filters, with convergence theory and O(N) scaling shown on square domains.
Erlangga, Advances in iterative methods and preconditioners for the Helmholtz equation, Archives of Computational Methods in Engineering 15 (1) (2008) 37–66
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A Multi-Frequency Helmholtz Solver Based on the WaveHoltz Algorithm
MFWH computes several Helmholtz solutions simultaneously from one wave-equation solve using multiple time filters, with convergence theory and O(N) scaling shown on square domains.