Author(s): Q. Xia; Z. Liu; X. Guo

Linked Author(s): Xiaolin Guo, Zhiqi Liu

Keywords: Energy dissipation; Hydraulic jump; Reattachment length; Numerical simulation; Renormalization group k-ε turbulence model

Abstract: A hydraulic jump is a good energy dissipator for eco-friendly dam construction. Using a stilling basin with a step-down floor remarkably decreases flow velocity on the floor as well as operation risk. Considering that the number of high dams that have adopted this type of energy dissipator has recently increased, this study investigates the relationship among reattachment length, step height, and flow depth and velocity on the step by applying a two-phase flow numerical simulation that combines the renormalization group k-ε turbulence model and the volume of fluid method. Simulation results show that the reattachment length does not change with the velocity on the step under certain conditions during which step height and flow depth on the step are variable. Fitting curves are established based on the dimensionless parameter of reattachment length/step height and step height/flow depth on the step.

DOI: https://doi.org/10.14264/uql.2014.32

Year: 2014