Two-Way Fluid-Solid Coupling Based On Granular Flow

In field of realistic computer graphics,people often pay close attention to the simulation of natural scenes or phenomena.And fluid and solid simulation is one of the most popular area.Currently there has already been some mature methods of fluid and solid simulation However,most of these methods focus on simple fluid or solid scenes or simple solid-fluid coupling.They are not sufficient for large-scale granular flow simulations,such as landslides,as well as highly frequent interactions between granular material and rigid bodies.For instance,the traditional methods are not efficient enough,and are not able to reflect the physical properties of granular material very well,and the fluid-solid coupling process don't have much authenticity,too.In this paper,based on the idea of Position Based Dynamics,we present an efficient algorithm for fluid and solid simulation and the two-way coupling between them.For solid simulation,we use the basic motion of rigid body and PBD framework,combined with a collision detection method based on hierarchical bounding box and signed distance field,which improves the computational efficiency.We add friction and cohesion model to popular Smoothed Particle Hydrodynamics and Position Based Fluid framework in order to simulate granular flow,and parallelize the algorithm with CUDA.Finally,we sample solid particles on the surface of solid objects,and construct a unified particle model to add fluid-so lid interactions at particle scale.As a result,we improve original physical models and algorithm framework,and successfully implement granular fow with two-way fluid-solid coupling.