Journal Publications

DOI number:10.1016/j.jsv.2025.119033

Journal:Journal of Sound and Vibration

Abstract:A hybrid multilevel fast multipole and equivalent source method (FM-ESM) has been developed for efficient aeroacoustic scattering prediction, which is distinguished by its application of the equivalent source concept across all fast multipole stages, including particle-to-multipole, multipole-to-multipole, multipole-to-local, local-to-local, local-to-particle, and particle-to-particle translations. The capability of the method for scattering predictions in two and three dimensions with different flow conditions is demonstrated through an analytical solution utilizing an image source method. Furthermore, the flexibility to reduce the number of equivalent sources is explored during particle-to-multipole and particle-to-particle translations, where the mismatch between equivalent sources and collocation points results in an over-determined system. To iteratively invert the resulting rectangular matrix, a variant of the generalized minimal residual algorithm known as the BA-GMRES method is utilized, accompanied by a specified pre-conditioner. A fast multipole boundary element method is included for reference under the same framework. Through examinations of cylindrical and spherical scattering, it is observed that FM-ESM, with fewer sources, efficiently yields accurate results in cases involving fictitious resonant frequencies. The method’s applicability to large-scale problems makes it a complementary choice for aeroacoustic scattering prediction.

Co-author:Siyang Zhong, Bao Chen, Peng Zhou, Wangqiao Chen

First Author:Lican Wang

Indexed by:Journal paper

Correspondence Author:Xin Zhang

Discipline:Engineering

First-Level Discipline:Aerospace Science and Technology

Document Type:J

Volume:607

Issue:119033

Translation or Not:no

Date of Publication:2025-03-20

Included Journals:SCI