Simulation Of Debries Flow Movement Based On SPH

Debris flow is fierce and destructive.It brings huge disasters to mankind.Due to the suddenness and unpredictability of the outbreak,it is difficult to capture the debries flow.The simulation of debries flow can revel the development and the process of disaster.Therefore,it is of great significance to simulate the debries flow.Debries flow movement can be seen as the coupling motion of liquid-phase slurry and solid-phase objects.Traditional modeling methods based on geometry can not represent the rich details on the surface of debries flow.This paper based on physical method and modeling based on the Smoothed Particle Hydrodynamics(SPH)method,the physical model of the fluid motion is transformed into a discrete form for numerical solution.Research on neighbor particle search,time step integration,fluid surface extraction,and analysis fluid-solid interaction problems.The content is as follows:(1)Simulate liquid slurry motion based on SPH.Obtained a basic frame of the Lagrangian fluid simulation.Analyze the neighbor-particle search algorithm,smoothing kernel function which Influence the accuracy and efficiency of algorithm.Using frog leaping algorithm for time step integration,update the position and velocity of slurry particles.In addition,extract the isosurface of the density field with the Marching Cubes algorithm,structure triangles of the fluid surface.form a realistic surface of debris flow by Rendering.(2)Extended SPH method to simulate the interaction between slurry and dynamic objects.The Objects in the scene of debries flow were Considered as rigid body.Sample the Surface particle of a rigid body which represented by a triangular mesh according to Gaussian quadrature rules.Analyze the forced of fluid particles and surface particles using a uniform SPH method.When dealing with the interaction between the slurry and the objects,the efficiency of the collision detection is improved by screening the particles on the surface of the slurry.(3)In order to balance reality and efficiency,using voronoi Diagram-based Fragment generation algorith through geometric partitioning of models in advance,the segmented fragment is regarded as rigid body,and assign them rigid body properties.Then simulate based on multi-body dynamics to realized the collapse and crushing effect of the house efficiently.(4)Because debries flow usually occurs in heavy rain weather,using the particle system in the unity3 d engine to simulate the effect of rain,and increase the effect of illumination,reflection,and refraction of debris flow motion,enhanced the realism of debris flow motion simulation.