Abstract
This chapter discusses the generation and propagation mechanisms of the sound generated by an obstacle in a uniform flow. It is investigated by using direct numerical solutions of the two-dimensional, unsteady, compressible Navier-Stokes equations. The generation and propagation mechanisms of the sound are essentially the same for the three obstacles, the sound pressure pulses are generated by vortex shedding. The results show that, in all the three cases, sound pressure waves are generated in response to the vortex shedding from the obstacle in its wake. The generation frequency of the sound pressure waves is equal to the vortex shedding frequency. The generated sound has a dipolar nature, and the fluctuation frequency of the lift coefficient is equal to the vortex shedding frequency. The effect of artificial forcing on the generation mechanism has also been studied in the chapter. The present results mentioned in the chapter shows that by using periodic blowing/suction, the generation and propagation of sound can be effectively controlled without drastic changes to the vortex shedding, at least to some degree.
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