  Self-sustained oscillation in Mach 3 supersonic cavity with a length-to-depth
ratio of 3 is investigated using wall modeled Large Eddy Simulation (LES)
methodology for ReD = 3.39*10^5. The unsteady data obtained through computation
is utilized to investigate the spatial and temporal evolution of the flow
field, especially second invariant of velocity tensor; while the phase averaged
data is analyzed over a feedback cycle to study the spatial structures. This
analysis is accompanied by the Proper Orthogonal Decomposition (POD) data,
which reveals the presence of discrete vortices along the shear layer. The POD
analysis is performed in both the spanwise and streamwise planes to extract the
coherence in flow structures. Finally, Dynamic Mode Decomposition (DMD) is
performed on the data sequence to get the dynamic information and deeper
insight into the self-sustained mechanism.
