k
grid size
Mittal [21] 
Mittal [21] 
Khater [23] 
Khater [23] 
0.005
9.9586e−008
9.734e−008
9.9899e−009
9.8076e−009
1.70e−007
1.50e−007
0.0005
7.4323e−008
7.0323e−008
8.1271e−009
7.0450e−009
9.82e−007
8.50e−007
0.0001
6.1132e−008
6.0724e−008
7.2310e−009
6.0548e−009
....
....
0.0001
3.2554e−008
3.0231e−008
3.9366e−009
3.0601e−009
...
...