DNS/LES方法在剪切湍流模拟中的应用  

DNS/LES method application in shear turbulence

作　　者：潘宏禄[1] 史可天[1] 马汉东[1] 

机构地区：[1]中国航天空气动力研究院,北京100074

出　　处：《空气动力学学报》2009年第4期444-450,共7页Acta Aerodynamica Sinica

摘　　要：提出采用DNS/LES混合方法进行自由剪切类混合流动湍流研究,该方法兼顾了直接数值模拟(DNS)方法在转捩线性范围内的高精确度模拟和大涡模拟(LES)方法在转捩非线性及全湍流区的高效模拟两方面优点,通过对低对流Mach数流场计算表明该方法可以较好地模拟流场的转捩过程。同时,文中还对比实验分析了湍流场对光学传输效应的影响,给出了与实验一致的结论。Hybrid method of DNS/LES has been offered to apply to free shear layer turbulent flow. The method includes DNS＇s advantage that can simulate the linear and weakly nonlinear flow zone exactly and LES＇s superiority which can simulate nonlinear zone, transition flow and full turbulent zone well. Low convective Maeh number mixing layer flow has been studied by DNS/LES method. The results indicate that mixing layer transition and turbulent development process have been simulated well. On the other hand, Aero-optic effects coefficient has been computed and analyzed.

关 键 词：转捩 湍流 可压缩剪切层 大涡模拟 直接数值模拟 

分 类 号：O357.5[理学—流体力学] V211.3[理学—力学]