Numerical Simulation of Effect of Expansion Angle and End-sill Location on the Hydraulic Jump in Gradually Expanding Stilling Basins

Document Type : Research Article


1 Civil Engineering Department, Science and Research Branch, Islamic Azad University, Tehran, Iran

2 Civil Engineering Department, Lamerd Branch, Islamic Azad University, Fars, Iran

3 Civil Engineering Department, Faculty of Engineering, Kharazmi University, Tehran, Iran


Expanding stilling basins not only are effective energy dissipators, but also appropriate translations between hydraulic structures. Hence, the present study aims at numerical simulation of the effect of end-sill location on the energy dissipation. Doing so, Fluent software was employed and hydraulic jump under two divergence angels and four end-sill locations in the range of 4 to 8 Froude number was examined. According to the results, for larger expansion angles, the sequent depth and jump length are lower and energy dissipation is much more. Moreover, as the end-sill closes to the basin’s entrance, the lower sequent depth, shorter jump, and less energy dissipation are observed. For very close locations more instability in the flow surface are seen. Results showed that for a given expansion angel, improving the location of the end-sill can decease 20% the conjugate depth, enhance 90% the amount of energy dissipation, and reduce 26% the jump length.


Main Subjects

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