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The current study implicates the development of the proper numerical model be relevant to the supersonic flow past a 3D open cavity with a length-to-depth ratio of 2. The Mach number of the supersonic free-stream is 2 in addition the Reynolds number of the flow is 10. The numerical simulations have been executed by deploying Large Eddy Simulation (LES) technique. The Smagorinky model is included for this purpose. The simulation results have been portrayed in the shape of pressure field and overall sound pressure level at the centreline of the front wall of the open cavity. As pragmatic, the feedback loop mechanism illuminates the trend of flow field of the open cavity very nicely. Very large pressure fluctuations are also detected inside the open cavity without spoiler. Yet, the reduction of the pressure fluctuations inside the open cavity is attained by integrating a spoiler in the form of one-fourth of a cylinder at the leading edge of the open cavity. Thus, the pressure less than the free-stream pressure is attained inside the open cavity. With the integration of the spoiler, the overall sound pressure level at the centreline of the front wall of the open cavity is also suppressed by some amount. Congruently, the sound pressure level is suppressed by almost 16 dB at the front wall and around 12 dB at the aft wall of the stated open cavity. The vicissitudes in the flow characteristics of the open cavity integrating the spoiler is also explored. In general, the comparisons between the numerical predictions of the cavity flows with and without the integration of the spoiler is also accomplished. Keywords—Numerical Simulation, Open Cavity, Spoiler, LES, Pressure Field, OASPL.

NUMERICAL MODELLING ON SUPERSONIC FLUID FLOW PAST A CAVITY WITH SPOILER FOR INVESTIGATIONS ON PRESSURE FIELD AND OASPL