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

Table 6

Numerical error of Example 6.

𝑛𝑥×𝑛𝑦×𝑛𝑧	Error in 𝑢^−	Order
10 × 10 × 10	0.041
20 × 20 × 20	0.011	1.92
40 × 40 × 40	0.0029	1.88
80 × 80 × 80	0.00076	1.95