$\alpha$

$\beta$

$\tau$

$\Vert u-u_h\Vert$

收敛阶

$\Vert q-q_h\Vert$

收敛阶

0.25

1.75

4

1.1014E−02

-

2.1851E−01

-

8

3.5408E−03

1.6371

7.0988E−02

1.6221

12

1.8298E−03

1.6281

3.7209E−02

1.5931

0.5

1.5

4

9.2919E−03

-

1.8452E−01

-

8

2.6592E−03

1.8050

5.3583E−02

1.7839

12

1.2504E−03

1.8610

2.5771E−02

1.8053

0.75

1.25

4

8.8596E−03

-

1.7599E−01

-

8

2.5443E−03

1.8000

5.1315E−02

1.7780

12

1.2071E−03

1.8389

2.4917E−02

1.7817