Dam bursting flood routing simulation method based on two-dimensional SPH

Abstract

A dam bursting flood routing simulation method based on two-dimensional SPH belongs to the technical field of geographic-science course simulation and geographic information systems. By the method, data information of a reservoir and downstream geographic space is obtained firstly, a flood routing two-dimensional mode based on a shallow water equation is established according to the obtained data, and a simulation course undergoes initialization which comprises initial configuration of particle properties, establishment of a neighborhood particle list of particles and setting of parameters; simulation circulation is started then, wherein whether boundary virtual particles are set is determined according to positions of the particles, and the neighborhood particle list of each water particle is updated; force borne by each water particle is calculated, and then the position and the speed of each water particle at the next time step are calculated; and collision detection is carried out, boundary punishment force is applied to change the position and the speed of the particle in case of a boundary, a fluid surface is extracted according to particle distribution, and the extracted fluid surface is rendered. The method provided by the invention can realize the relatively real analogue simulation of the large-scale dam bursting flood routing situations.

Description

technical field [0001] The invention belongs to the technical field of geoscience process simulation and geographic information system, and relates to a simulation modeling method, in particular to a dam break flood evolution simulation method based on two-dimensional SPH. Background technique [0002] Frequent geological disasters have brought huge losses to the society. The process simulation and simulation of natural or man-made disasters such as dam breaks and floods, which involve geosciences, simulation calculations, physics, computer graphics and other disciplines, have become It has become a hot and difficult point of current research. [0003] In the field of geographic information systems, traditional simulations are realized by using empirical formula models such as geological models or mathematical models, that is, by analyzing the main influencing factors of the evolution process of dam break floods, such as terrain slopes, confluence, etc., using spatial analys...

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Problems solved by technology

However, grid-based methods are prone to grid distortion when dealing with large-deformed fluids, resulting in increased computational complexity and decreased accuracy, while smoothed particle hydrodynamics (SPH) based on pull When solving the governing equations, the Grangian particle method often pursues the authenticity of the simulation effect and increases the number of particles, and requires reconstruction of the fluid surface (such as the Marching Cubes method), which increases the amount of calculation and increases the cost of computer hardware. Require

To a certain extent, these methods do not meet the needs of real-time simulation of fluids in large-scale scenarios such as dam failure floods

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