基于D3bQ15晶格离散三维风场的飘雪模拟  

Discretizing three-dimensional wind field for falling snow simulation based on D3bQ15 lattice

作　　者：吕梦雅[1] 王娟[1] 唐勇[1] 王丽君[1] 代军丽[1] 

机构地区：[1]燕山大学信息科学与工程学院,河北秦皇岛066004

出　　处：《计算机应用研究》2010年第4期1566-1568,1583,共4页Application Research of Computers

基　　金：国家"863"计划资助项目(2008XXX)

摘　　要：基于格子BGK建立风场模型时,针对所用笛卡尔晶格的离散速度数少时,风场模型的数值精确度低;而离散速度数多时,计算速度慢的局限性,提出用体心立方晶格D3bQ15离散三维风场。D3bQ15晶格更好的各向同性及特定空间较少的采样数,调和了由离散速度数决定的风场模型的精确度与计算效率之间的矛盾。实验证明:飘雪场景仿真中风场建模时,用D3bQ15晶格比用笛卡尔晶格能更好地满足飘雪场景真实性和实时性的要求。For the lattice BGK model,the numerical accuracy of the wind field is lower when the quantity of the discrete velocity is fewer,but the computational efficiency is slower when the quantity of the discrete velocity is more.This paper developed a new method.Used the D3bQ15 of body-centre cubic lattice to discrete three-dimensional wind field in view of the limitations of the Cartesian lattice.D3bQ15 lattice had better isotropic and the fewer samples in specific space.It could reconcile the contradictions between the accuracy and the efficiency caused by the quantity of discrete velocity.The results show that the new developed method can better meet the demand in the authenticity and the real-time for the falling snow scene than the Cartesian lattice.

关 键 词：飘雪场景 格子BGK模型 D3bQ15晶格 笛卡尔晶格 

分 类 号：TP391.9[自动化与计算机技术—计算机应用技术]