High-Order Compact Difference Scheme and Multigrid Method for Solving the 2D Elliptic Problems

Table 4

Number of multigrid V(2,2) iterations and CPU time of the CDS and the FOC scheme for Problem 1.

Re	=1/64				=1/128				=1/256
	CDS		FOC		CDS		FOC		CDS		FOC
	Num	CPU	Num	CPU	Num	CPU	Num	CPU	Num	CPU	Num	CPU
1	9	0.17	7	0.18	9	0.42	7	0.45	9	1.56	7	1.61
10	9	0.17	7	0.17	9	0.42	7	0.43	9	1.56	7	1.59
10^2	8	0.15	8	0.17	8	0.39	8	0.48	8	1.42	7	1.61
10^3	-	-	9	0.18	-	-	8	0.48	-	-	8	1.77
10^4	-	-	22	0.28	-	-	24	1.03	-	-	20	3.56
10^5	-	-	136	1.14	-	-	115	4.11	-	-	103	15.98
10^6	-	-	177	1.45	-	-	583	19.94	-	-	955	134.2

Note: - indicates divergence, etc.