A computational tool for industrial aeroacoustic applications

Abstract

This paper presents a computational tool for industrial aero-and hydroacoustic applications. This tool solves the three dimensional linearized Euler equations with using a dispersion-relationpreserving scheme in space associated with a fourth order Runge-Kutta algorithm in time. An image method provides precise boundary conditions and may be used to exactly specify a zero normal velocity at a wall. An original implementation of an artificial selective damping limits the attenuation of the signal without loosing its efficiency on spurious numerical modes. Three industrial applications of this tool are then presented : • The first one concerns the propagation of a depressurization wave in a nuclear reactor. This study allows an improved description of the process than that obtained from a global dimensional model. • The study of the propagation and of the generation of noise in a butterfly valve is then presented. Numerical results match the experimental data both for the transfer matrix and the acoustic source. • The acoustic study of a 216 MW gas turbine exhaust duct constitutes the third illustration of the method.