A proper numerical model is developed to investigate supersonic flow over a 3D open cavity. The studies on supersonic flow over the 3D cavity having length-to-depth ratio of 2, include the supersonic free-stream Mach number of 2 as well as the flow Reynolds number of 10 5 . The numerical simulation has been carried out by using the Large Eddy Simulation (LES) technique. The Smagorinky model is incorporated for this investigation. The predicted results have been compared with the experimental

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... simulation results available in the literature. The results have been demonstrated in the form of both coefficient of pressure (Cp) and overall sound pressure level (OASPL) at the centreline of the front wall of the stated open cavity. The coefficient of pressure appears to match both qualitatively and quantitatively with the existing experimental and numerical results reported by the other investigators. Nevertheless, the overall sound pressure level at the centreline of the front wall of the said open cavity is over-predicted by approximately 40-80 dB. Furthermore, the feedback loop mechanism of the cavity has also been described. Pretty large pressure fluctuations are witnessed inside the cavity and hence these must be supressed. Nonetheless, the inclusion of a spoiler is also planned for future to alter the flow behaviours inside the cavity which may bring about the reduction in both pressure oscillations and overall sound pressure level at the centreline of the front wall of the stated open cavity.