Optimal 25-Point Finite-Difference Subgridding Techniques for the 2D Helmholtz Equation

Table 2

The performance of the refined subgridding 25p. The pair denotes the error for the layer with and the layer with , respectively.

	(12 m, 6 m)	(6 m, 3 m)	(3 m, 1.5 m)
	11432	36602	100100
Errors	(0.0370, 0.0261)	(0.0208, 0.0077)	(0.0185, 0.0029)
Time	73.3205 s	796.7439 s	s