k = Δ t

l 2 error norm

Max. abs. error

1 × 10−8

1.24425 × 109

2.50000 × 109

5 × 10−8

3.60618 × 109

7.01476 × 109

9 × 10−8

6.28548 × 109

1.23521 × 108

1 × 107

6.96308 × 109

1.36862 × 108

5 × 107

3.43304 × 108

6.70310 × 108

9 × 107

6.17481 × 108

1.20322 × 107

0.000001

6.86028 × 108

1.33638 × 107

0.000005

3.42689 × 107

6.63631 × 107

0.000009

6.16534 × 107

1.18849 × 106

0.0001

6.84959 × 107

1.31890 × 106