α

h

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

Order ≈

$\Vert u-U\Vert$

Order ≈

0.3

0.6

0.9

1/20

1/30

1/40

1/50

1/20

1/30

1/40

1/50

1/20

1/30

1/40

1/50

4.1206e−03

1.8305e−03

1.0295e−03

6.5883e−04

4.1082e−03

1.8263e−03

1.0274e−03

6.5755e−04

4.0921e−03

1.8201e−03

1.0241e−03

6.5550e−04

—

2.0012

2.0005

2.0003

—

1.9994

1.9996

1.9999

—

1.9981

1.9990

1.9995

2.0602e−03

9.1521e−04

5.1427e−04

3.2940e−04

2.0540e−03

9.1310e−04

5.1366e−04

3.2876e−04

2.0459e−03

9.1001e−04

5.1202e−04

3.2773e−04

—

2.0012

2.0036

1.9964

—

1.9994

1.9997

1.9998

—

1.9980

1.9991

1.9995