Numerical Investigation of Energy Dissipation and Hydraulic Performance of Slotted Roller Buckets with a Different Teeth Configuration

The issue of scouring downstream of dams is one of the main topics that must be considered in the hydraulic design of structures.The enormous energy carried by the flow during spillway discharge, if not controlled, can cause severe erosion in the downstream area of the dam.To reduce the amount of scouring, it is necessary to examine the flow hydraulics and reduce turbulent energy and velocity in the flow direction while increasing the velocity in perpendicular directions to the flow, which leads to increased mixing.This can be achieved by using energy dissipators to reduce scouring.This study examines the roller bucket and the displacement of its teeth.In this manner, a roller bucket with zigzag teeth is used.The bucket and spillway were constructed using AutoCAD software and tested in FLOW-3D software to determine the modified hydraulics compared to aligned teeth.The results showed that the implemented changes decreased energy and velocity in the flow direction and increased the velocity perpendicular to the flow.It is evident that these results can reduce scouring in the downstream area of the bucket. .