Numerical Method for Solving Matrix Coefficient Elliptic Equation on Irregular Domains with Sharp-Edged Boundaries

Table 5

Numerical error of Example 5.

𝑛𝑥×𝑛𝑦×𝑛𝑧	Error in 𝑢^−	Order
10 × 10 × 10	0.00090
20 × 20 × 20	0.00025	1.86
40 × 40 × 40	0.000062	2.01
80 × 80 × 80	0.000015	2.00