三维树木随风运动真实感模拟  

Realistic Simulation of Three-dimensional Trees Swaying in the Wind

作　　者：李峰[1] 顾文晓[1] 曾兰玲[1] 

机构地区：[1]江苏大学计算机科学与通信工程学院,镇江212013

出　　处：《计算机科学》2012年第11期254-260,共7页Computer Science

摘　　要：提出了一种真实感较强的模拟树在风中摇曳的方法。该方法采用L系统建立树的有限元模型。引入Perlin噪声函数建立具有自然风的1/f波动特性的风速模型;采用材料力学中梁的运动模型模拟枝干受风力弯曲。详细分析了树对风的遮挡:枝干遮挡和叶子遮挡,即风场与树之间的"流固耦合"现象,特别是在处理枝干遮挡过程中,采用了流体力学中的圆柱绕流模型。实验结果表明,该方法模拟的风吹树动效果逼真,可以达到实时显示的效果。This paper presented a highly realistic simulation of the tree swaying in the wind method.The method uses L-system to build the finite element model of tree.Perlin noise function was introduced to establish wind model which has natural wind＇s 1/f fluctuation characteristics.Mechanics of materials beam motion model was used to simulate branches bent by the wind.This paper analysed in detail the trees block to wind：branch block and leaf block,that is ＂fluid-structure interaction＂ phenomenon between wind and tree,especially in dealing with the process of branch block,using flow around circular cylinder in the model.The results show that this method gets realistic effects on a tree swaying in the wind,and the effect of real-time display can be achieved.

关 键 词：树 1 f波动 风速模型 流固耦合 圆柱绕流 

分 类 号：TP391.9[自动化与计算机技术—计算机应用技术]