The evolution of three-dimensional temporally evolving plane mizing layers under strong vortez disturbances
The evolution of three-dimensional temporally evolving plane mixing layers under strong vortex disturbances is investigated by DNS method. The isentropic vortex is chosen as the model for vortex disturbances. Three different directions of the vortex axis (the streamwise, spanwise and normal directions) are considered in the simulations. For comparison, the computation with linear unstable oblique waves as disturbances is also executed. In the case of the streamwise vortex disturbance, significant increase, in vorticity thickness can be found only in the early stage of development. In the case of the normal vortex disturbance, a high growth rate of the plane mixing layer is kept all the time, while in the linear waves case saturation occurs in the later stage of the simulation and the vorticity thickness stops increasing further. In the case of the spanwise vortex disturbance, the flow is quite quiet and the vorticity thickness attains the lowest growth rate. In addition, based on the evolution of the large scale structures the mechanism of mixing enhancement is analyzed.
compressible mizing layer direct numerical simulation vortez disturbance
Qiang Zhou Feng He M.Y.Shen
School of Aerospace, Tsinghua University, Beijing, 100084, PR China
国际会议
北京
英文
1-5
2008-10-23（万方平台首次上网日期，不代表论文的发表时间）