摘要： 在虚拟场景中进行污染仿真实验时，需要对逼真度和实时性进行权衡。基于粒子系统给出一个模拟污染气流扩散的方法，用户通过调整粒子动力学方程中的参数可观察污染气流在不同环境下的运动变化。利用浓度场内空间粒子大小与透明度的逐渐变化，实现烟雾生成的逼真效果，达到降低粒子数量的目的。实验结果显示，该方法在普通PC平台上可以获得实时的绘制速度。

关键词: 粒子系统, 浓度场, 流体动力学, 虚拟场景

Abstract: When conducting a pollutional simulation experiment in a virtual scene, it should compromise the demands of fidelity and property of real-time. This paper presents an approach for the simulation of polluted airflow emission based on particle system. User can see the polluted airflow change in different kinds of environment by adjusting parameters in the dynamics equation of particles. It imposes gradually changing of special particle size and diaphaneity in density field, achieves realistic effect of smog, reaches the intent of reducing particle number. Experimental results show that the method can achieve real-time of protracting speed in common PC platform.

Key words: particle system, density field, fluid dynamics, virtual scene

中图分类号: 

• TP391.9