The numerical research on the the transition of the three-Dimensional supersonic spatial developing mixing layer when Mc=0.5
In this paper, a fourth order difference scheme based on frequency spectrum relation preservation and developed boundary processing methods are used to make simulations on the three- dimensional supersonic spatial developing mixing layer when the convective Mach number Mc=0.5. The researches show that, when imposing three-dimensional disturbances, large scale vortices sizes are developed and the ow evolves into turbulence by transition finally. In the process, ow pat- terns are characterized as the vortex splitting, vortex ribs and hairpin vortices, and the ow evolves into turbulence through the lift-up and breakdown of hairpin vortices. The preliminary statistics show that the ow has the features of turbulence through statistical analysis. The simulations also show that, the vortex-pairing patterns are absent in the evolution of the mixing layer unlike the two- dimensional counterparts, new features especially like the vortex splitting and stream-wise vortices (ribs and hairpin vortices) are dominant in the evolving process.
mixing layers numerical simulations vortex transition turbulence
Q.Li X.B.Deng H.X.Zhang
China Aerodynamics Research and Development Center, Mianyang, Sichuan 621000, China;National Laborat China Aerodynamics Research and Development Center, Mianyang, Sichuan 621000, China
国际会议
The Fifth International Conference on Fluid Mechanics(第五届国际流体力学会议)
上海
英文
2007-08-15（万方平台首次上网日期，不代表论文的发表时间）