Corrigendum to Numerical assessment of fan blades screen effect on fan/OGV interaction tonal noise [Journal of Sound and Vibration, 481 September 2020 115428]

[Abstract:] The authors apologise for any inconvenience.The authors acknowledge the financial support from Safran Aircraft Engines. Xesús Nogueira and Luis Ramírez acknowledge the support given by FEDER funds of the European Union, Grants #DPI2015- 68431-R of the Ministerio de Economía y Competitividad and #RTI2018-093366-B-I00 of the Ministerio de Ciencia, Innovación y Universidades of the Spanish Government, and by the Consellería de Cultura, Educación e Ordenación Universitaria of the Xunta de Galicia (program Axudas para potenciación de grupos de investigación do Sistema Universitario de Galicia 2018, grant #ED431C 2018/41)

Acoustic wave propagation in effective graded fully anisotropic fluid layers

International audienc

Numerical assessment of fan blades screen effect on fan/OGV interaction tonal noise

This work deals with sound generation and transmission in a fan stage. The study is done on a subsonic Fan stage and interaction noise between the fan wakes and the Outlet Guide Vanes (OGV) is considered. For this purpose, the Linearized Euler Equations (LEE) are solved with a steady axisymmetric flow. The acoustic sources are modelled by a scattering approach. Numerical simulations are carried out in an unwrapped cylindrical layer using a high-order finite volume solver. In order to explicitly take into account the moving fan blades into the propagation medium, a high-resolution sliding mesh technique is used. The simulation results, which highlight the screen effect of moving fan blades on fan/OGV interaction tones, are consistent with analytical literature.Xesús Nogueira and Luis Ramírez acknowledge the support given by FEDER funds of the European Union, Grants #DPI2015- 68431-R of the Ministerio de Economía y Competitividad and #RTI2018-093366-B-I00 of the Ministerio de Ciencia, Innovación y Universidades of the Spanish Government, and by the Consellería de Cultura, Educación e Ordenación Universitaria of the Xunta de Galicia (program Axudas para potenciación de grupos de investigación do Sistema Universitario de Galicia 2018, grant #ED431C 2018/41)

High-order preserving sliding-mesh techniques for Turbomachinery

Ce travail porte sur le développement de maillages glissants pour le calcul d'écoulements/d'ondes acoustiques en présence de configuration avec rotor/stator. Deux familles de techniques de transmission de l'information d'un maillage à l'autre sont proposées. Afin de s'adapter aux applications industrielles et leurs géométries complexes, ces méthodes ont été proposé pour les maillages non-structurés. Basés sur l'approximation des moindres carrés mobiles, ces techniques s'adaptent naturellement à une discrétisation de type volumes finis d'ordre élevé. Dans cette communication nous montrons, à l'aide du cas test du pulse acoustique, les propriétés de précision et de conservation de ces méthodes numériques ainsi que leur domaine de stabilité

Optimally graded porous material for broadband perfect absorption of sound

International audienceThis article presents a numerical optimization procedure of continuous gradient porous layer properties to achieve perfect absorption under normal incidence. This design tool is applied on a graded porous medium composed of a periodic arrangement of ordered unit cells allowing to link the effective acoustic properties to its geometry. The best micro-geometry continuous gradient providing the optimal acoustic reflection and/or transmission is designed via a nonlinear conjugate gradient algorithm. The acoustic performances of the so-designed continuous graded material are discussed with respect to the optimized homogeneous, i.e. non-graded, and monotonically graded material. The numerical results show a shifting of the perfect absorption peak to lower frequencies or a widening of the perfect absorption frequency range for graded materials when compared to uniform ones. The results are validated experimentally on 3D-printed samples therefore confirming the relevance of such gradient along with the efficiency of the control of the entire design process. a) [email protected]