摘要
利用直接数值模拟研究了槽道湍流中脉动拟涡能输运对反向控制的瞬时响应.发现流向和展向拟涡能的衰减首先由拉伸产生项的抑制引起,而法向拟涡能的减小是因为控制阻碍了平均剪切的倾斜.在控制的初始阶段,流向拟涡能的演化远远落后于其它两个分量的变化.法向涡量快速单调减小,并对其它两个分量的减弱起到了重要作用.
The transient response of turbulent enstrophy transport to opposition control in turbulent channel flow was studied with the aid of direct numerical simulation.It is found that the streamwise and spanwise enstrophy are suppressed by the attenuation of the stretching terms at first,while the vertical enstrophy is reduced by inhibiting the tilting of mean shear.During the initial period of the control,the streamwise enstrophy evolves much slower than the other two components.The vertical vorticity component exhibits a rapid monotonic decrease and also plays an important role in the attenuation of the other two components.
出处
《应用数学和力学》
CSCD
北大核心
2013年第2期139-148,共10页
Applied Mathematics and Mechanics
基金
国家自然科学基金资助项目(10925210
11002081
11132005)
关键词
拟涡能
槽道湍流
反向控制
直接数值模拟
enstrophy transport
opposition control
turbulent channel flow
direct numerical simulation
