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

4.0633e−02

1.8075e−02

1.0170e−02

6.5100e−03

4.0389e−02

1.7992e−02

1.0129e−02

6.4848e−03

4.0071e−02

1.7870e−02

1.0064e−02

6.4445e−03

—

1.9978

1.9990

1.9992

—

1.9943

1.9971

1.9985

—

1.9916

1.9958

1.9975

2.0306e−02

9.0329e−03

5.0826e−03

3.2533e−03

2.0184e−02

8.9914e−03

5.0617e−03

3.2407e−03

2.0025e−02

8.9304e−03

5.0293e−03

3.2205e−03

—

1.9978

1.9989

1.9994

—

1.9943

1.9972

1.9983

—

1.9916

1.9959

1.9976