Modeling aeroacoustic excitations by subsonic wave packets in the Kirchhoff formalism
TypeCommunications avec actes
The present work aims at linking the shape of a wave packet to its acoustic e ciency through numerical integration of the homogeneous Helmholtz equation in the Kirchho formalism. We shall consider the case of a bidimensional, rectangular domain where one side is a ected by a spatially evolving wave packet as a boundary condition with subsonic convection velocity. In the rst place, the numerical tool is validated by comparison with analytical developments available in literature. Then, an extension to more advanced forms of wave packet is approached. The appearance of a criterion for acoustic e ciency is discussed, as well as the need for a proper de nition regarding the acoustic energy of a wave packet and its radiated energy output.
Files in this item
Showing items related by title, author, creator and subject.
ZAARAOUI, Abdelkader; RAVELET, Florent; MARGNAT, Florent; KHELLADI, Sofiane (Elsevier, 2013)A prototype device for measuring the volumetric flow-rate by counting vortices has been designed and realized. It consists of a square-section pipe in which are placed a two-dimensional bluff body and a strain gauge force ...
RAVELET, Florent; BAKIR, Farid; KHELLADI, Sofiane; REY, Robert (Elsevier, 2013)This article presents an experimental study of the hydraulic transport of very large solid particles (above 5 mm) in an horizontal pipe. Two specific masses are used for the solids. The solids are spheres that are large ...
DANLOS, Amélie; MÉHAL, Jean-Elie; RAVELET, Florent; COUTIER-DELGOSHA, Olivier; BAKIR, Farid (ASME, 2014)Instabilities of a partial cavity developed on a hydrofoil, a converging-diverging step, or in an interblade channel have already been investigated in many previous works. The aim of this study is to evaluate a passive ...
NOURI, Hussain; DANLOS, Amélie; RAVELET, Florent; BAKIR, Farid; SARRAF, Christophe (2013)The purpose of this work is to study experimentally the aerodynamic characteristics of a subsonic counter-rotating axial-flow fans system operating in a ducted configuration. The fans of diameter D = 375 mm were designed ...
SAINT-MICHEL, Brice; DUBRULLE, Bérengère; MARIÉ, Louis; RAVELET, Florent; DAVIAUD, François (APS, 2013)We study the influence on steady turbulent states of the forcing in a von Karman flow, at constant impeller speed, or at constant torque. We find that the different forcing conditions change the nature of the stability of ...