The cavitation index and flow pressure were computed for 77 scenarios with 7 Froude numbers ranging from 2.56 to 20.1 and 11 expansion angles (0, 1, 2, …, 10) (see Table 3). Different Froude numbers were used to determine the possibility of cavitation and flow pressure at the entrance of the transition region. It is worth noting that the cross-section shape of this region was rectangular in all simulations.
Froude numbers and lateral expansion angles used in this study
| Specified pressure (reservoir head) . | Froude number . | α . |
|---|---|---|
| 5 7 15 35 50 80 100 (normal water level in Seymareh bottom Dam) | 2.56 4.49 6.30 10.90 14.00 17.50 20.10 | 0 1 2 3 4 5 6 7 8 9 10 |
| Specified pressure (reservoir head) . | Froude number . | α . |
|---|---|---|
| 5 7 15 35 50 80 100 (normal water level in Seymareh bottom Dam) | 2.56 4.49 6.30 10.90 14.00 17.50 20.10 | 0 1 2 3 4 5 6 7 8 9 10 |