Numerical Simulation Of Wave Propagation Generated By Landslide Besed On OpenFOAM

Disasters caused by landslide surges refer to the initial surges generated after a certain volume of landslides hits the water body and spreads far away in the waters,causing disasters to ships,coastal personnel and facilities in the water.The main reasons for the instability of most landslides can be attributed to the following aspects.One is the construction of water conservancy projects that has changed the local natural geographical conditions and the distribution of soil stress,which is easy to cause deformation and damage of the soil and rock masses around the water conservancy project.On the other hand,during the period of application,the change of pore pressure caused by the rapid rise or fall of the water level can easily induce the instability and slide of the landslide mass as well.The construction and use of water conservancy and hydropower projects play an important role in my country’s shipping,electric power and agricultural irrigation,but there are also potential safety hazards that induce landslide instability and generate swells.Therefore,in order to prevent or reduce the disasters caused by landslide surges,it is necessary to carry out research on the generation and propagation characteristics of landslide surges.In this thesis,based on the open source CFD software OpenFOAM,a two-dimensional numerical water tank is established to analyze the propagation characteristics of landslide swell,and the numerical calculation of the large motion of the rigid landslide body is realized by the overlapping grid technology.Combined with the waves2 Foam toolbox,an appropriate waveabsorbing boundary is set to reduce the impact of surge reflections.In order to verify the correctness of the landslide swell numerical flume,this paper sets up and calculates the following three typical experimental examples: the problem of wedge-shaped body entering water,the problem of solitary wave generated by a square box entering water vertically,and the sliding of landslide body along a 45° slope The swell problem is formed.The velocity of the wedge-shaped body,the falling velocity of the square box,the solitary wave shape and the propagation process of the landslide swell are calculated and compared respectively.The results show that the numerical simulation results are in good agreement with the experimental values.The sink can accurately simulate landslide swell problems.Further,this paper carried out a numerical simulation for the swell problem of a partially submerged landslide,and discussed the factors such as the forward inclination angle,relative thickness,relative volume,relative mass,initial velocity,slope angle and water depth of the landslide mass on the generation and relationship of the landslide swell.The influence of propagation,through nonlinear analysis,the fitting formulas of the maximum wave amplitude,maximum wave height,wave period and propagation speed of the landslide swell are obtained,and the empirical formula for the attenuation of the landslide swell in its propagation direction and with time changes is obtained.At the same time,the propagation and arrival time of landslide surge is predicted,which provides data support for disaster prevention and mitigation related to landslide surge.