摘要
回顾了包括中心差分、一阶迎风、二阶迎风、三阶迎风、指数格式、乘方格式以及QUICK格式等常用的几种对流项离散格式,将上述格式应用于同一对流流场进行数值计算,计算表明,各种格式在网格与流场平行时都表现出了良好的特性,而在网格与流场交错时都出现不同程度的假扩散.讨论了产生假扩散的原因,最后提出了减小假扩散现象的方案.
Some common discrete schemes are reviewed in this paper, such as central difference scheme, first-order upwind difference scheme, second-order upwind difference scheme, thirdorder upwind difference scheme, exponential scheme, power law scheme and QUICK scheme. To evaluate the influence of various schemes on the fluid field calculation, these schemes are used to calculate the same fluid flow field. The results show that there is no false diffusion when streamline is followed gridlines. But the false diffusion is appeared when streamline is not parallel with gridlines. The reason of the false diffusion is analyzed in rapid sequence. At last, this paper adopts the mentioned schemes to solve the false diffusion in fluid field calculation.
出处
《数值计算与计算机应用》
CSCD
北大核心
2010年第2期153-160,共8页
Journal on Numerical Methods and Computer Applications
关键词
对流项
离散格式
流场计算
假扩散
convective term
discrete scheme
fluid field calculation
false diffusion
