The formation of large scale structures for the supersonic flow over a rectangular cavity is studied using Large Eddy Simulation (LES) and Proper Orthogonal Decomposition (POD), while the sub-grid scales (SGS) are modelled using dynamic Smagorinsky model. The Pressure distribution along the cavity walls obtained through the simulation is in good agreement with the empirical results presented in [1]. The Isosurfaces of Q show the evolution of structures inside as well as in the wake of the cavity. The contours of vorticity magnitude clearly show the flapping of the shear layer which is responsible for the generation of a feedback mechanism in the cavity. The density gradient contours show the propagation of transverse as well as longitudinal waves from the cavity. The large scale vortical structures in the mid plane along with the bending of the flow inside the cavity are captured by the POD basis functions.
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