Large Eddy Simulations for Transitional and Turbulent Flows in Mixing Layers
In this paper, two types of 3-D spatial evolving compressible mixing layers, namely, supersonic/supersonic mixing layers and supersonic/subsonic mixing layers, are studied. The transition process and fully developed turbulent flows in different convective Mach numbers are investigated using the large eddy simulation (LES) method. The computational results show that the most instable disturbance mechanism is the 3-D oblique wave perturbation in high convective Mach number. A vortices dominate the transition process. The consistency of LES results to natural transition and the relevant literature data indicates that is reasonable to investigate mixing layer development by induce linear disturbance. Shocklets which distribute unsymmetrical have been captured by the LES method at the convective Mach number 1.0. Their shapes are similar to experiment results. In the fully developed turbulence region, velocity pulse tendency towards isotropy and the compressibility effect increases with the convective Mach number.
compressible mixing layer transition turbulence large eddy simulation direct numerical simulation
PAN Hong-lu MA Han-dong WANG Qiang
China Academy of Aerospace Aerodynamics, Beijing 100074, China
国际会议
上海
英文
135-144
2011-11-21（万方平台首次上网日期，不代表论文的发表时间）