BGK模型的精度分析及模型改进

Analyzing of the Precision of BGK and Its Modifications

从差分的角度由Boltzmann方程离散出格子Boltzmann方程,并以D2Q9模型为例,分析了BGK模型的误差来源,针对BGK模型存在由网格步长和压缩效应所产生的双重误差进行了改进,从而消除了部分误差,提高了该方法的计算精度。

This article, from differential angle separates lattice Boltzmann equation from Boltzmann e quation, and taking D2Q9 mod the above, this study improves duced by grid step length and t as an example, anal e model by consideri compression effect, and improving the calculation accuracy of the method. yzes the error source of BGK model. Based on ng the double error of BGK model which is prowith the aim of eliminating a part of the error,