Richardson Cascadic Multigrid Method for 2D Poisson Equation Based on a Fourth Order Compact Scheme

Table 2

Numerical results of EXCMG and RCMG for Example 5.

𝐿	1/ℎ𝐿	EXCMG		RCMG
		||𝑢^𝐿−𝑢||∞	cpu	||𝑢^𝐿−𝑢||∞	cpu
3	128	2.80𝐸−06	0.39	1.77𝐸−06	0.16
	256	4.50𝐸−07	1.22	2.50𝐸−07	0.50
	512	4.18𝐸−08	4.17	3.16𝐸−08	1.23
4	128	1.07𝐸−05	0.25	4.29𝐸−06	0.11
	256	1.92𝐸−06	1.00	9.28𝐸−07	0.30
	512	1.71𝐸−07	4.23	1.39𝐸−07	1.17
5	128	1.74𝐸−05	0.28	2.56𝐸−06	0.09
	256	5.29𝐸−06	1.01	2.00𝐸−06	0.31
	512	7.94𝐸−07	4.07	3.35𝐸−07	1.06