January 2008
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Three-dimensional direct numerical simulations are performed for the spatiallydeveloping plane mixing layer at concevtive Mach number 1.2. The shocks are generated by organized vortex structures and turbulent motions after the breakdown of large structures into small vortices. A simple and effective criterion based on dilation is used for shock identification. The 3-D view of shocks are obtained. It is shown that the origin of most of shocks in the mixing layer is closely bound up with vortices. Different types of shocks are illustrated based on their different generation mechanisms