Table 4: Numerical error and convergence rate .

Mesh
Norm typeError Rate Error Rate Error Rate Error Rate

1.36 1.07 1.03
1.31 0.97 0.95
1.00 1.00 1.00
1.00 1.00 1.00
1.01 1.00 1.00
1.00 0.99 0.99