Comparison of Algebraic Multigrid Preconditioners for Solving Helmholtz Equations

Table 2

Computational performance of GMRES with SLPs.

𝑘	(𝛽1,𝛽2)=(0,0)		(𝛽1,𝛽2)=(−1,0)		(𝛽1,𝛽2)=(0,1)		(𝛽1,𝛽2)=(1,0.5)		(𝛽1,𝛽2)=(1,0.3)
	Iter	𝑇_solve (s)	Iter	𝑇_solve (s)	Iter	𝑇_solve (s)	Iter	𝑇_solve (s)	Iter	𝑇_solve (s)
10	15	0.593	19	0.282	18	0.625	13	0.39	11	3.422
20	50	1.218	64	1.406	56	98.032	38	2.046	29	6.328
30	99	4.547	125	5.203	113	185.468	69	170.484	—	—