Research On Fluid-solid Coupling Simulation Based On Physics

Realistic simulation of natural scene has always been a hot and difficult problem in the field of computer graphics,the simulation of dynamic fluid is particularly prominent.Ocean is a representative,it plays a key role in the field of virtual reality.In the research of ocean simulation based on physics,the details are not enough and the fluid-solid interaction realistic is poor,which affects the promotion and application of this technology.We study on the fluid movement and fluid-solid coupling simulation.First of all,it makes a summarization on the physical basics of fluid simulation,solve the Navier-Stokes equations of fluid motion and research on the Smoothed Particle Hydrodynamics methods,choose B-spline function as the kernel function to realize the SPH algorithm through the comparative analysis.Discuss the calculation method of numerical integration mode,adopt mid-point method to update fluid particle's position.In view of the low efficiency in the process of the fluid surface reconstruction problem,we put forward a method to limit the extract process on the surface of the fluid and the space and time efficiency of surface reconstruction is a certain ascend.The Lennard-Jones potential function is used as kernel function to model the particle inter-atomic forces and realize the simulation of the surface tension.Then we do in-depth analysis and research about interaction between the solid and fluid.Because there is no particle in the outside boundary,SPH method will create a larger error when it calculates integral calculation in the boundary.In our paper,we improve the boundary movement and add some random parameter values based on the direct rebound method,cut speed in a certain degree and implement a more realistic boundary movement effect.Building symbols from the field and use the uniform particle sampling method on surface based on symbolic distance field,classifying point on the model of zero point to the boundary model and calculate the distance,describing the particle position update.We put forward a fluid-solid two-way interaction flow simulation method between solid model and fluid particles based on control points.We use the control points matrix to simulate surface topography,simulate particle information works as the control points by extracting the boundary of the SPH method to infect the solid model and use surface model data comes back to the particles properties,realize the fluid-structure two-way interaction simulation successfully.