Grid

Crank Nicolson

Douglas

Rate

Rate

Rate

31 × 31

-

-

-

-

-

-

51 × 51

2.1882

3.0712

3.1098

2.881

3.0941

3.8172

81 × 81

2.1761

3.1971

3.2910

2.5619

3.4218

3.8971

101 × 101

1.4097

3.3468

4.0118

2.9431

3.7689

3.9981