Solid Crushing Simulation In Liquid-solid Interaction

Recent years,virtual reality technology has developed rapidly,and people have gradually increased their interest in simulation of natural scenes and phenomena.Floods,mudslides,and dam breaks are all very serious natural disasters in the world,posing a huge threat to people's lives and state property.Disaster simulation and danger rehearsal for a given area through virtual reality technology will provide a huge guiding role for disaster prevention and rescue and disaster relief,and has great application value and research significance.Liquid-solid interaction is a common phenomenon in these scenarios,and it is also a difficult problem to simulate it,especially for large-scale scenarios.We propose a liquid-solid interactive simulation framework with a unified particle model,starting from the Navier-Stokes equation in the Lagrangian perspective,using meshless smooth particle hydrodynamics and position-based rigid body dynamics.The specific contents are as follows:Firstly,in order to speed up the simulation efficiency,the mesh-based smooth particle hydrodynamics method is optimized by optimizing the neighborhood particle search,and the liquid surface is extracted by the moving cube algorithm to realize the liquid simulation.Secondly,in order to achieve a more stable and efficient liquid-solid interaction simulation,a stable liquid-solid interaction model was constructed by performing a Poisson disk sampling on the solid boundary and an adaptive density correction algorithm to correct the particle density of the fluid boundary.Thirdly,in order to produce more realistic solid debris,a new pre-crushing method is proposed.With the Voronoi diagram algorithm and bool operation,the pre-crushing processing of concave polygons based on Voronoi diagram algorithm is realized.On the basis of position dynamics,efficient solid debris dynamic simulation is realized.Finally,through the modeling the scene of the hydraulic structure of the cross-river section of the Middle Route of the South-to-North Water Transfer Project,the two groups of disaster scenarios were simulated by the liquid-solid interaction framework proposed in this paper,and got good simulation results.In the end,we analyze the resulting data.