The Numerical Simulation Of Hydraulic Jumps On Corrugated Beds With SPH Method

Hydraulic jump is one of the common energy dissipation forms in hydraulic structures.The jump length and depth will affect the length of the stilling basin and its height.Submergence and turbulence of the hydraulic jump make the free surface produce complex changes.Therefore,it is difficult to establish and solve the turbulence model when performing numerical simulation.All these leads to many problems in the experimental research,theoretical research and numerical simulation of hydraulic jump.SPH method have advantages in dealing with large deformation and free surface tracking problems.Therefore,in this paper SPH method,SPHysics the open source code and combining with existing experimental research data is used to study the hydraulic jump that forms on a corrugated bed.The influence of wave form,wave crest,wavelength,on the hydraulic jump characteristic of corrugated bed is explored.And got the variation law of hydraulic jump characteristics on the corrugated bed.Optimal waveform is obtained with the goal of improving the energy dissipation rate,providing reference data for the research of such energy dissipator.The main conclusions are as follows: SPH method can be applied to the study of corrugated beds.In addition,the hydraulic jump length and water depth after the jump on the corrugated beds are both reduced,and the energy dissipation rate increases significantly.It shows the superiority of corrugated beds in energy dissipation.The energy dissipation rate of the three waveform is higher than that of the smooth bed.Among them,the triangle bed has the best energy dissipation rate,the sinusoidal bed is the second,and the trapezoidal bed is the worst.Under the same conditions,the wave height is directly proportional to the water depth and length of the jump,and inversely proportional to the energy dissipation rate.Wave length is directly proportional to jump length and energy dissipation rate and inversely proportional to jump.Therefore,under appropriate conditions,the wave height should be reduced and the wavelength increased to improve the energy dissipation rate.