$\tau$

$\beta =4$

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

收敛阶

$\beta =6$

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

收敛阶

$\frac{1}{64}$

0.069819

0.054153

$\frac{1}{128}$

0.019121

1.8685

0.013188

2.0377

$\frac{1}{256}$

0.004294

2.1547

0.003101

2.0883