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

7.2392e−03

9.6939e−04

1.8474e−04

4.2611e−05

7.3520e−03

9.8069e−04

1.8699e−04

4.3163e−05

7.3015e−03

9.8548e−04

1.8974e−04

4.3988e−05

—

2.9007

2.3916

2.1162

—

2.9063

2.3908

2.1151

—

2.8893

2.3768

2.1089

3.9869e−03

5.3685e−04

1.0242e−04

2.3571e−05

4.0485e−03

5.4294e−04

1.0363e−04

2.3858e−05

4.0198e−03

5.4535e−04

1.0508e−04

2.4285e−05

—

2.8927

2.3900

2.1194

—

2.8985

2.3894

2.1189

—

2.8819

2.3757

2.1134