Numerical Simulation Study Of Surge Propagation Process And Characteristics Based On Smooth Particle Method

The swell caused by earthquakes,landslides and other factors affects the normal operation of water conservancy,shipping and other facilities,and seriously threatens the lives and property of coastal residents.N umerical simulation of the swell propagation under typical conditions is carried out by numerical simulation.The kinetic information obtained by the calculation can be used to study the propagation characteristics of swell waves,and it has practical reference significance for the coastal coastal disaster protection engineering.The Smoothed Particle Hydrodynamics(SPH)method has advantages in dealing with fluid flow problems with large deformations.The thesis uses the open source program SPHysics to calculate the simulation,and realizes the simulation of landslide movement,opening and closing gate and setting obstacle by FORTRAN language rewriting,and studies the dam surge process,landslide surge process,opening and closing gate and controlling obstacle.Under the surge process,the surge process under different conditions is compared with the analytical solution and experimental data to verify its numerical correctness.The numerical simulation of the dam surge gives the velocity and pressure distribution characteristics of the water body.Studies have shown that when the water depth is large,the assumptions of the analytical theory are no longer satisfied,so the analytical theoretical solution is no longer applicable.The numerical simulation of the rigid body landslide gives the variation of the waveform and wave height of the surge.The results show that the second maximum creep of the near-shore surge reverse propagation is greater than the first maximum climb,according to the calculation of the opposite shore.The relationship between the climb height and the slope angle is the sensitive range of the surge climb on the other side(40°-60° for the first climb and 45° for the second climb).In the numerical simulation of the opening and closing gate,the four typical propagation stages of the surge under the protective structure are obtained.The calculation also gives different gate starting speeds and opening degrees,as well as setting different types of obstacles.The transient pressure distribution,the pressure bending time history curve,the maximum force and the time-course curve of the control factors of the surge wave at each observation point of the protection structure.Through the comparative analysis of the calculation results,the influence of the gate starting speed and opening degree on the force of the protective structure is obtained,and the stable control conditions of the protective structure under the condition of the example are obtained.Finally,the effects of different types of obstacles are compared,and the rationality of obstacle forms under the constraints of the site is evaluated.