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

Table 4

Numerical error of Example 4.

𝑛𝑥×𝑛𝑦×𝑛𝑧	Error in 𝑢^−	Order
10 × 10 × 10	0.016
20 × 20 × 20	0.0050	1.70
40 × 40 × 40	0.0013	1.96
80 × 80 × 80	0.00032	2.02