Experimental And Numerical Study Of Sluices Rapidly Varied Unsteady Flow Based On VOF And Turbulence Model

China is confronting deficient of water resources, and company with increase of population, development of economy and global warming, the problem becomes more and more serious.Water transportation by pipes or channels is utilized in water resources allocation projects and irrigation projects. Sluice gates adjust the water level and control the flow discharge, besides, the change of sluice gate height affects the Flow Pattern. During this process, Flow Pattern downstream is unsteady rapidly varied flow. Unsteady flow caused at downstream impacts on Hydraulic Structures.According to the Statistics in2000year, among the total dangerous sluices, destruction of the energy dissipation facilities is responsible to42.3percentages in sluice gate damages. Thus, there is a causal relationship between the damage of energy dissipation facilities and the unsteady rapidly varied flow with gates operation.The physical model test on unsteady rapidly varied flow with gates operation was presented in this paper, the turbulence model combined with VOF two phases model simulated the unsteady rapidly varied flow, and studied the construction of flow pattern.Major Contents and Conclusions:1) The UDF program was developed to control the operation of sluice gates in the model simulation; the PISO pressure and velocity coupled method, self-adaptive mesh skill and high quality structured quadrilateral mesh were used in order to increase the speed and accuracy of calculation.2) The pressure in stilling basin base was the highest when the sluice gate was opening. At the same point in the cross section, the pressure increased with sluice time up along the vertical direction, but the increasing speed was slow and the total pressure was going to be steady.3) The region where the velocity increased obviously was around the slope side of stilling basin. The velocity in high velocity region decreased and moved to the sluice with the sluice time increasing; the highest velocity located in approximate0.2m beyond the base of slope side.4) The velocity distribution at the end of apron was uniform and had almost no change at0.2m up from the bottom, but the velocity near the bottom was still high and scoured the downstream significantly.