Eventos Anais de eventos
COBEM 2019
25th International Congress of Mechanical Engineering
STUDY OF THE ACOUSTIC REFLECTION AROUND A CYLINDER BY THE BOUNDARY ELEMENT METHOD
Submission Author:
William Denner Pires Fonseca , SP
Co-Authors:
William Denner Pires Fonseca, Adriano Goto, CARLOS CESAR CORREIA ARANHA JUNIOR, Patrício Araújo Filho
Presenter: William Denner Pires Fonseca
doi://10.26678/ABCM.COBEM2019.COB2019-0280
Abstract
The computational simulation of highly complex problems is of paramount importance for the development of complex mathematical models. Some of these problems are related to the acoustic radiation of the sound sources, whose modeling is of fundamental importance to understand the propagation of the acoustic waves and, consequently, to develop mechanisms for the reduction of acoustic noise. The propagation of acoustic waves involves different phenomena like radiation, absorption, transmission and reflection. The analytical formulation of the linear equation to the acoustic wave is obtained through the mass conservation equation, the Navier-Stokes equation and the state equation. From these equations, we find Helmholtz equation which describes the problem of acoustic radiation. In this work the numerical solution of the integral Helmholtz equation for a pulsating infinite cylinder in a free and homogeneous medium is obtained. The numerical formulation used for this problem is obtained using the Boundary Element Method (BEM). This method presents a great power to solve problems of the infinite domain, in relation to differential methods, reducing the dimension of the problem, thus simplifying the input data to be worked and consequently reducing the computational time used.
Keywords
Acoustic Prediction, Numerical analysis, Boundary Element Method
