Based on the compressible Navier-Stokes equation

the initial flow structures of a supersonic planar jet at Ma=1.4 were investigated numerically with use of large eddy simulation (LES) and combination of the high-order hybrid WENO/TCD schemes. The numerical results illustrate clearly the initial flow characteristics of a supersonic planar jet

such as the generation and evolution of the main vortex ring and shock structures. Since the vortex-induced shock pair appears in the main vortex ring

the interaction of shock with vortex can accelerate the instability of jet shear layer

making the first roll up location differ from the subsonic case of just downstream the vortex-induced shock pair. After the vortexlets formation

the subsequent interactions with the vortex-induced shock pair would lead to a significant shape deformation of shock and accelerate the instability of main vortex ring.