1 viv wall free -- khalak & willamson 1997
| case | m* | ζ |
| 1 | 2.4 | 0.0045 |
| 2 | 3.3 | 0.0026 |
| 3 | 10 | 0.00135 |
- fn is not given
in our setup, Re/Ur = 1000 ( ref. zhao, 2011, JFS)
| Ur | 2 | 3 | 3.5 | 3.92 | 5 | 6 | 7 | 8 | 9 | 10 | 11 |
| Re | 2000 | 3000 | 3500 | 3920 | 5000 | 6000 | 7000 | 8000 | 9000 | 10000 | 11000 |