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This fluid dynamics video shows visualizations of a Large-Eddy Simulation(LES) of an over-expanded planar nozzle. This configuration represents theexperimental setup of Papamoschou et. al. which found the position of theinternal shock to be unstable. Our LES calculations confirm this instabilityand offer a vibrant and dynamic view of the underlying flow physics. Theinteraction between shock and turbulent boundary layer is shown as is thesubsequent separation region downstream. Numerical Schlieren provide a glimpseof the low frequency shock motion and suggest potential mechanisms for theinstability. Key features include the asymmetry of the shock structure (withlarge and small lambda shocks), compression and expansion waves downstream ofthe shock and large scale flow reversal. Full details of the experiment and thecalculation can be found in the references.

Large-Eddy Simulation of an over-expanded planar nozzle