h

$\alpha =1.1$

$\alpha =1.5$

$\alpha =1.9$

${\Vert e\Vert }_{L_2}$

order

${\Vert e\Vert }_{L_2}$

order

${\Vert e\Vert }_{L_2}$

order

1/36

6.2367e−08

1.7600e−06

3.4639e−05

1/49

2.5157e−08

2.9448

7.0975e−07

2.9456

1.3916e−05

2.9579

1/64

1.1428e−08

2.9546

3.2178e−07

2.9620

6.2896e−06

2.9736

1/81

5.6916e−09

2.9591

1.5981e−07

2.9710

3.1157e−06

2.9819

1/100

3.0492e−09

2.9617

8.5351e−08

2.9765

1.6605e−06

2.9865