On Xinshe Old-stepped Spillway Hydraulic Feature Numerical Simulation of Yan'an Yellow River Diversion Work

The stepped spillway was used to design the Xinshe old inverted siphon of Yan'an Yellow River diversion work.The improvement RNG k-ε turbulence model and SIMPLEC algorithm were used, with 3D numerical simulation, it researched its hydraulic features.With the 1:1.2 slope ratio, it analyzed the change rule of time pressure distribution,velocity distribution and air ration of design working condition with the different step sizes stepped energy dissipater.