Eventos Anais de eventos
COBEM 2017
24th ABCM International Congress of Mechanical Engineering
Boundary integral solution of sound propagation and scattering in non-uniform potential flows with a numerical Green’s function
Submission Author:
Simone Mancini , United Kingdom , United Kingdom
Co-Authors:
Victor H. P. Rosa, Simone Mancini
Presenter: Victor H. P. Rosa
doi://10.26678/ABCM.COBEM2017.COB17-0274
Abstract
Sound propagation in moving media can be solved using a boundary integral formulation to the limit of weakly non-uniform potential flows. For low Mach numbers, an approximate analytical Green's function can be found as a combination of the physical models associated with the Taylor and Lorentz transforms. A boundary element method can then be used to solve scattering of sound by solid surfaces in a mean flow. These solutions, however, deteriorate with increasing Mach number and frequency. In this work, we compute a numerical Green's function to assess the error of the approximate analytical Green's function. It is shown that the numerical Green's provides only minor improvements to the solutions based on the analytical Green's function. It is concluded that the analytical Green's function is a good approximation of the exact one.
Keywords
sound propagation, sound scattering, non-uniform flows, Boundary Element Method
