An empirical model of noise sources in subsonic jets, formulated in a linear resolvent framework

KARBAN U., Bugeat B., Agarwal A., Lesshafft L., Jordan P.

28th AIAA/CEAS Aeroacoustics Conference, 2022, Southampton, England, 14 - 17 June 2022 identifier

  • Publication Type: Conference Paper / Full Text
  • Doi Number: 10.2514/6.2022-2933
  • City: Southampton
  • Country: England
  • Middle East Technical University Affiliated: Yes

Abstract

© 2022, American Institute of Aeronautics and Astronautics Inc, AIAA., All rights reserved.We present an analysis aiming to identify the acoustically efficient forcing components in subsonic jets using an LES database. The forcing terms, which correspond to the source terms in the classical terminology of acoustic analogies, are defined within the resolvent framework. We extract from a jet database at Mach number, M= 0.4, which contains both state and forcing data, a low-rank representation of the acoustic field and a low-rank forcing that is correlated with it. We show that the forcing components that generate 99% of the acoustic energy in the downstream region correspond to less than 1% of the total forcing energy.