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

4.8790e−03

3.1855e−04

2.0141e−05

1.2671e−06

4.9616e−03

3.2140e−04

2.0265e−05

1.2733e−06

4.8584e−03

3.1242e−04

1.9642e−05

1.2318e−06

—

3.9370

3.9833

3.9905

—

3.9484

3.9873

3.9923

—

3.9589

3.9915

3.9951

2.6858e−03

1.7607e−04

1.1126e−05

6.9719e−07

2.7313e−03

1.7764e−04

1.1195e−05

7.0064e−07

2.6742e−03

1.7269e−04

1.0852e−05

6.7782e−07

—

3.9311

3.9841

3.9962

—

3.9426

3.9880

3.9980

—

3.9529

3.9922

4.0009