Table 2.

Errors and convergence rate.

Global level κ = 0 grids	163		323		643
Grid sizes for ηκmax = η2	$\frac{40}{64}$		$\frac{40}{128}$		$\frac{40}{256}$
Time step sizes θ	2 × 10−2		1 × 10−2		5 × 10−3
Error		3.41765 × 10−3		1.76463 × 10−3
Rate			0.95364