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Direct simulation of aerodynamic noise generated due to unsteady flow past oval-shaped cylinders of constant blockage lengths have been performed using high resolution, Dispersion Relation Preserving (DRP) scheme. Aerodynamic noise generation and its propagation features are analyzed for different oval-shaped cylinders. Behavior of lift and drag dipoles has been analyzed using Proper Orthogonal Decomposition (POD) method. The obtained dominant POD modes along with anomalous modes are compared. Furthermore, the acoustic, hydrodynamic and entropic modes have been separated using Doak's decomposition theory and subsequently the obtained acoustic modes are related to fluctuations in the flow field. The effect of Mach number on directivity patterns and noise levels based on Root Mean Square (RMS) values of acoustic pressure fluctuations are analyzed and compared. In the present computations, an Optimized Coupled Compact Difference (OCCD) scheme along with Optimized five stage Runge-Kutta (ORK5) scheme are adopted in the dicretization process.
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