摘要
为了降低高雷诺数条件下大涡模拟方法的计算量,将两方程k-ωSST湍流模型与Yoshizawa一方程亚格子模型通过一个衔接函数相结合,构造一种混合大涡/雷诺平均NS方程模拟方法(混合LES/RANS)。使用这种方法及AUSM+-up格式对20°压缩斜坡的马赫2.85流动进行模拟,并考察了固定入口和在入口添加白噪声两种湍流入口边界条件对于结果的影响。模拟结果再现了边界层的分离、再附以及分离激波等现象,计算得到的分离区要显著大于试验结果,对于这种混合模拟方法的缺点进行了分析,并提出了可能的改进方法。
In order to reduce the computational cost of LES for high Reynolds number,a hybrid Large Eddy Simulation/Reynolds-Averaged Navier-Stokes （hybrid LES/RANS） approach which combined two-equation k-ω SST turbulence model and Yoshizawa＇s one-equation sub-grid scale model with a blending function was developed. The hybrid method together with AUSM＋-up scheme was conducted to investigate a Mach 2.85 flow field of a 20-degree compression ramp. The effects of two kinds of inflow boundary conditions （fixed inlet and inlet with super-imposed white noise） were investigated. Separation and reattachment of the boundary layer along with separation shock were obtained from the simulation. The separation zone predicted was significantly larger than the experimental result. Defects of the hybrid method were analyzed and possible improvements were presented.
出处
《国防科技大学学报》
EI
CAS
CSCD
北大核心
2010年第4期1-6,共6页
Journal of National University of Defense Technology
基金
国家自然科学基金项目(10802096)
