Skin Friction Reduction Characteristics of Nonsmooth Surfaces Inspired by the Shapes of Barchan Dunes

Table 2

Validation of the grid independence.

Grid quantity	Skin friction of nonsmooth surfaces (N)	Skin friction of smooth surfaces (N)
475960	0.2985	0.4685
1316163	0.3081	0.4851
1845908	0.3106	0.4859
2747751	0.3291	0.4959
3273305	0.3281	0.4941