$p_{\xi }=p_{\eta }$

DOF

${\Vert u-u^h\Vert }_{\infty \mathrm{,}\text{rel}}$

${\Vert v-v^h\Vert }_{\infty \mathrm{,}\text{rel}}$

${\Vert u-u^h\Vert }_{L_2\mathrm{,}\text{rel}}$

${\Vert v-v^h\Vert }_{L_2\mathrm{,}\text{rel}}$

2

60

3.816E−00

2.333E−00

3.142E−00

2.103E−00

3

96

1.435E−00

1.945E−01

6.447E−01

1.812E−01

4

176

2.284E−01

1.017E−01

1.659E−01

8.127E−02

5

280

7.493E−02

1.142E−02

2.754E−02

1.069E−01

6

408

1.822E−02

6.621E−03

7.580E−03

3.255E−03

7

560

5.590E−03

6.702E−04

1.180E−03

5.394E−04

8

736

1.264E−03

4.110E−04

3.269E−04

1.306E−04

9

936

3.618E−04

5.643E−05

4.977E−05

2.551E−05

10

1160

8.230E−05

2.636E−05

1.364E−05

5.271E−06

11

1408

2.154E−05

3.159E−06

2.054E−06

1.164E−06

12

1680

4.766E−06

1.446E−06

5.569E−07

2.153E−07

13

1976

1.230E−06

3.281E−07

8.242E−08

5.206E−08

14

2296

1.688E−07

1.783E−07

2.231E−08

8.811E−09