$\tau$

$\beta =2$

${\Vert {\widehat{e}}_u\Vert }_{H^1}$

收敛阶

$\beta =4$

${\Vert {\widehat{e}}_u\Vert }_{H^1}$

收敛阶

$\frac{1}{64}$

0.074343

0.047937

$\frac{1}{128}$

0.020612

1.8507

0.010880

2.1394

$\frac{1}{256}$

0.004996

2.0447

0.002814

1.9507