H

h

$\Vert u-{\tilde{u}}^h\Vert$

$\Vert p-{\tilde{p}}^h\Vert$

${\eta }_{\mathcal{A}}$

$\frac{\Vert p-{\tilde{p}}^h\Vert }{{\eta }_{\mathcal{A}}}$

1/2

1/4

0.0669

1.6708

1.9978

0.84

1/4

1/16

0.0062

0.4379

0.4652

0.94

1/8

1/64

0.0013

0.1093

0.1137

0.96

1/16

1/256

0.0004

0.0273

0.0282

0.97