Numerical Simulation of Flow Reattachment Length in Stilling Basin with Step-down Floor

The concept of eco-friendly trend of dam construction, Energy dissipation of hydraulic jump is a good type of energy dissipator. The use of stilling basin with step-down floor can remarkably decrease flow velocity on the floor and operation risk. In the context of a number of high dam adopted this energy dissipator in recent years, this article studied the relationship of reattachment length, step height, flow depth on the step and velocity on the step applying two-phase flow numerical simulation combining RNG k-ε Turbulence mode with VOF method. The simulation result show that the reattachment length does not change with the velocity on step under certain conditions in the variable of Step height and flow depth on the step. Based on the dimensionless parameter of L/d (Reattachment Length /step heigh) and d/h0(step height/flow depth on the step), their fitting curves are established

Keywords:

energy dissipation by hydraulic jump , Reattachment Length , Numerical Simulation , RNG k-ε Turbulence model