The Simulation Of Irregular Object

To hypothesize each kind of natural phenomenon is an important exploration computer graphics domain,especially for those irregular objects is a difficult problem.With the development of technology and the improvement of the performance of computer ,computer graphic processors can simulate the rea1 wor1d more and more realistically.There were three methods for fluid simulation in computer graphics:particle system method, mathematic and physics-based method and the method of texture technique. mathematic and physics-based method is a more mature method.Physics-based fluid flow simulation is commonplace in many scientific and mathematical computations. It also greatly improves the visual fidelity of comuter graphics app1ications. Fluid effects are everywhere,from rising smoke,clouds,and mist to the flow of rivers and oceans.We could say that the potential app1ications of it are end1ess. This report will describe a method for fast,stable fluid simulation.It wil1 introduce fluid dynamics and associated mathematics,and demonstrate how to implement them on a CPU.After finishing implementation of the model fluid simulation,we can further extend the simulation for different applications.The main contributions of this thesis are mainly in the following aspects:(1) Based on the Navier-Stokes equations,we simulate the smoke flowing .To make sure stability with large time-step, the semi-Lagrangian method is used to compute the advection term and the Jacobi iteration method is used to compute the pressure-Poisson equation and the diffusion term. To process the complex obstacles, we introduce the modification texture which is used to embody various boundary conditions.(2) To make the result more natural, when dealing with the result, we introduce the vorticity confinement to make up the dissipation and use the kriging interpolation method to improve the result.