Numerical simulation calculation of hydraulic transition process in free-flow tunnel

The hydraulic transition process in free-flow tunnel of water diversion and power generation system in water power station is a new issue in the design of water power station especially it is met frequently in the development of cascade water power station.The paper gives the foundational equation of hydraulic transition process numerical simulation in the free-flow tunnel and the additional equation of the boundary for upstream,downstream and waste weir,calculates the water level variation process in free-flow tunnel.