摘要
本文把NND格式推广到了特征变量、守恒变量和原始变量形式。通过引入通量差分分裂方法,由守恒变量形式的NND格式得到了Roe的近似Riemann解法,并讨论了限制器的作用。在隐式NND格式中引入了一种分解算法,提高了计算效率。本文的数值计算表明,NND格式对复杂波系干扰、边界层分离与再附等流动现象均有较高的分辨率。
In this paper,NND scheme is extended to three forms based on different variables,i.e.,characteristic variable,conservative variable and primitive variable. Roe'S approximate Riemann solver is obtained by introducing flux difference snlitting method to conservative variable NND scheme. The effects of limiter are discussed.Moreover,a factori-zation algorithm is introduced to implicit NND scheme to raise computa-tional efficiency.The numerical experiments show that NND schemes can resolve robustly both boundary layer separation,attachment and complex shock waves interferences.
出处
《空气动力学学报》
CSCD
北大核心
1994年第2期121-129,共9页
Acta Aerodynamica Sinica
关键词
NND格式
粘流
激波
NND scheme,shock waves,viscous flow.