摘要
在预处理Roe格式中加入可调参数,给出了一种低耗散预处理Roe格式,并分析了可调参数的取值规律.在极低速区,低耗散预处理Roe格式反应了流动的实际耗散;在与来流速度相近的区域,低耗散预处理Roe格式可以保证流场的稳定性.对低马赫数、低雷诺数定常圆柱绕流和低马赫数、高雷诺数NA-CA0012翼型绕流所做的数值实验,得到了比较满意的结果,表明这一改进对于低速流数值模拟是有效的.通过数值实验,发现计算格式的数值黏性对低速流动的计算结果有显著影响.
A low-diffusion preconditioning Roe scheme was proposed by using an adjustable parameter in preconditioning Roe scheme to control the numerical dissipation and the adjustable parameter value rules.The low-diffusion preconditioning Roe scheme reflected the real physical dissipation in the extremely low-speed zone.In the region similar to the inflow speed,low-diffusion preconditioning Roe scheme could ensure the stability of the flow field.The low Mach/low Reynolds number steady solutions of viscous flow passing a circular cylinder and the low Mach/high Reynolds number steady solutions of viscous flow passing NACA0012 were satisfied.Numerical results show the efficiency of the new scheme to simulate low Mach number flows.Numerical experiments show that the numerical dissipation of the scheme has a notable effect on low-speed flow numerical simulation with preconditioning method.
出处
《航空动力学报》
EI
CAS
CSCD
北大核心
2011年第3期524-529,共6页
Journal of Aerospace Power
关键词
数值方法
定常流
圆柱绕流
预处理方法
翼型
numerical methods
steady flow
flow past a cylinder
preconditioning method
airfoil
