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

Table 5

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

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	7	0.17	7	0.17	7	0.34	7	0.43	7	1.23	7	1.59
10	8	0.15	7	0.18	7	0.34	7	0.43	7	1.25	7	1.59
10^2	7	0.15	7	0.18	8	0.37	7	0.45	8	1.375	7	1.58
10^3	-	-	6	0.17	-	-	8	0.46	-	-	8	1.73
10^4	-	-	42	0.43	-	-	32	1.29	-	-	24	4.13
10^5	-	-	349	2.75	-	-	364	12.53	-	-	232	35.23
10^6	-	-	403	3.17	-	-	1402	47.70	-	-	3423	514.1