Numerical simulation of overflow with consider of shape of flip bucket in chute spillway

Flip bucket is one part of dam spillways for energy dissipation. Flip bucket are a standard element of dam spillways for an efficient energy dissipation if takeoff velocities are large, and stilling basins cannot be applied.
This study investigates the hydraulic performance of a triangular-shaped, rather than the conventional circular-shaped, bucket placed at the takeoff of flip bucket. In this research we survey and compare some hydraulic parameters like depth, velocity, frude number and cavitation number on triangular and circular flip bucket. In simulation, we used volume of fluid(VOF) method and k-ε (RNG) turbulence model.
Analyze of results of this research proposed a kind of triangular flip bucket instead of circular flip bucket and also shows that the circular flip bucket has a middle behavior in compare with two kinds of triangular flip buckets in investigation in depth, frude number and cavitation number.
Investigation in behavior of cavitation number of these three flip buckets shows that flip bucket A is a good and proper substitution in contrast with triangular flip bucket B. Also surveying of connection between frude number and cavitation number in end of chute and flip bucket which has critical point that maximum potential of cavitation and this point is not necessary in maximum discharge.