${\Vert {\text{Error}}_{\text{cd}}\Vert }_{\infty }$

$\epsilon =10$

${\Vert {\text{Error}}_{\text{cd}}\Vert }_{\infty }$

$\epsilon =1$

${\Vert {\text{Error}}_{\text{cd}}\Vert }_{\infty }$

$\epsilon =\frac{1}{10}$

${\Vert {\text{Error}}_{\text{cd}}\Vert }_{\infty }$

$\epsilon =\frac{1}{100}$

${\Vert {\text{Error}}_{\text{cd}}\Vert }_{\infty }$

$\epsilon =\frac{1}{200}$

$N_x=N_y=21$

3.59E−05

5.43E−05

0.003404

0.614740

1.585612

$N_x=N_y=41$

9.01E−06

1.36E−05

0.000856

0.171562

0.662713

$N_x=N_y=51$

5.77E−06

8.70E−06

0.000547

0.111182

0.421548

$N_x=N_y=81$

2.25E−06

3.40E−06

0.000214

0.045283

0.186831

$N_x=N_y=101$

1.44E−06

2.18E−06

0.000137

0.029173

0.123285