α

h

${\Vert u-U\Vert }_{\infty }$

Order ≈

$\Vert u-U\Vert$

Order ≈

0.3

0.6

0.9

1/5

1/10

1/20

1/40

1/5

1/10

1/20

1/40

1/5

1/10

1/20

1/40

2.5267e−04

1.7291e−05

1.0927e−06

6.8846e−08

2.5690e−04

1.7444e−05

1.0993e−06

6.9182e−08

2.5159e−04

1.6961e−05

1.0660e−06

6.6948e−08

—

3.8692

3.9841

3.9884

—

3.8804

3.9881

3.9900

—

3.8908

3.9919

3.9930

1.3605e−04

8.8958e−06

5.6198e−07

3.5215e−08

1.3832e−04

8.9745e−06

5.6541e−07

3.5387e−08

1.3546e−04

8.7266e−06

5.4826e−07

3.4246e−08

—

3.9349

3.9845

3.9963

—

3.9460

3.9885

3.9980

—

3.9563

3.9925

4.0009