The Numerical Simulation Of The Landslide Surge And The Interactions With Structures

Landslide surge happens when unstability of the bank slope of the reservoir occurs and landslide mass falls into water severely. Landslide surge includes a large number of pulse waves like nonlinear waves and shallow water, which can be classified as four wave patterns such as Stokes-like wave、Cnoidal-like wave、(Solitary-like wave and Bore-like wave. Landslide brings about fearful threat to the ships on sail, the residents along the bank and other infrastructures. Meanwhile, potential security risks exist in big amount of domestic water conservancy projects, which are in sore need of the prevention technology against landslip surge. Therefore, the study on the fluid dynamics under highly nonlinear wave turbulence model and the development of the numerical simulation method of Landslide surge has important theoretical and practical significance.This paper is based on the large eddy simulation CFD platform and emphasizes the viscosity equations under space fixed Cartesian grid, adopts cut-cell method that is dispense with boundary simulation, precisely numerical simulates the interaction of landslide surge and other marine structures by building a mathematical model containing the particle of moving interface and Liquid two phase liquid measure, including ingenuity designed and VOF method, which is used to highly nonlinear free surface.The paper contains five chapters:In Chapter1the occurrence mechanism and research status of landslide surge are briefly stated and my research object and main working scope is put up with.In Chapter2the rationale of cut-cell method is briefly introduced, which provides numerical simulation with technical foundation.In Chapter3the mathematical mode and calculation method is presented. It mainly includes the finite volume method based on time simplicity, the discretization of nonlinearity convective term and diffusion term with the method of Essential nonOscillation and central difference respectively, pressure and velocity coupling with the projection method and SGS model which is characterized by self-adaption and local regulation turbulence. In chapter4the numerical simulation equation of landslide surge is programmed and then applied to the numerical calculation of landslide surge, and the numerical result is compared and rectified with physical experiment result.In chapter5the result is analyzed and conclusion is drawn, the forecast of the research is made.In this paper, a two phase liquid measure mathematical model which shows the effect of multi-object motion to flow field is developed based on self-dependent built single phase flow CFD platform under the Cartesian grid in inertial frame of reference and the typical liquid-solid and wave-solid coupling problems of the interaction of2D landslipe surge and other marine structures are numerically simulated. The comparison with relevant experiment results proves the feasibility and validity of the prediction model of the effect of multi-motion object on flow field, which lays a solid foundation the further theoretical study on the landslide surge and the response of structures.