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Parallel computation of forward radiated noise of ducted fans with acoustic treatment

Forward radiated noise of ducted fans is computed numerically on parallel processors solving the three-dimensional, time-dependent Euler equations in body-conformed coordinates with a fourth-order-accurate, finite-difference, Runge-Kutta time-integration scheme. Sound attenuation effects of inlet wall acoustic treatment are included in computations employing a time-discrete form of the standard impedance condition. A distributed computing approach with domain decomposition is used for integrating the equations in parallel using the message passing interface library routines. The abilities of the method are demonstrated with hard- and soft-wall simulations of the JT15D inlet, including flow effects.