A Stochastic Approach To Compute Subsonic-Noise Using Linearized Euler's Equations*

This paper introduces an improved version of the Stochastic Noise Generation and Radiation (SNGR) model, with an application to a subsonic jet noise. The SNGR niodel allows to simulate the generation and propagation of aerodynamic noise from a numerical solution of the Reynolds averaged Navier-Stokes equations using a Ic - E closure. First a stochastic simulation of a turbulent velocity field is obtained by random Fourier modes. Then, this turbulent field is used as a source term in the Euler equations linearized around the mean flow previously calculated. This method was already applied to confined flows in 2-D and 3-D. Subsonic jet noise was also studied. HowTver the SNGR model was applied with an axisymmetric calculationof the propagation. In this work, a full 3-D calculation of the propagation is carried out with an improved stochastic turbulent field for the case of a round subsonic jet.

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