计算流体力学中流体表面追踪方法概述

Overview of the Water-surface-tracking Method in CFD

CFD（计算流体力学）自从诞生以来；一直致力于各种自然现象的计算机模拟工作，如烟雾、火焰、水流、爆炸等现象；它追溯自然现象的物理本质，借助自然现象的物理描述（将自然现象抽象成物理方程）结合现代计算机的快速计算能力，计算物理描述的属性值及其变化，从而实现视觉效果的模拟。模拟的步骤可以概括为：根据力学理论建立计算模型，即为流体力学的运动方程，一般是较为复杂的非线性偏微分方程，若想要全面描述流体的运动过程，还必须考虑能量守恒、连续性方程等；针对不同类型的非线性偏微分方程寻求最恰当的数值解方法；使用计算机编制求解的算法程序进行计算求解；通过计算机上的工具实现自然现象的视觉呈现；运用力学理论知识对模拟结果进行分析和解释，最终得出科学结论。

Since its naissance , CFD（Computational Fluid Dynamics）has been working to simulate various natural phenomena by computer, such as smoke, fire, water, explosion phenomenon;It traces the physical essence of natural phenomenon, with the aid of the physical description （natural phenomenon abstract into physical equation） combined with fast computing power of modern computer, calculate the attribute value and its changes, so as to realize the simulation of visual effects. The steps can be summarized as ： Set up the calculation model according to the theory of mechanics; which are movement of fluid mechanics equations, they are generally complex nonlinear partial differential equations, to fully describe the process of the fluid movement must also consider the conservation of energy, continuity equation, etc; In view of the different types of numerical solution of nonlinear partial differential equation for the most appropriate method;Using computer program solving algorithm for the solu-tion;Through computer tools to realize the visual presentation of natural phenomenon;Using the mechanics theory knowledge for analysis and interpretation of the simulation results;Final draw scientific conclusions.