@article {Feng:2020:0736-2935:2419,
title = "Investigation of acoustic sources in the unsteady flow using spectral acoustic analogy",
journal = "INTER-NOISE and NOISE-CON Congress and Conference Proceedings",
parent_itemid = "infobike://ince/incecp",
publishercode ="ince",
year = "2020",
volume = "261",
number = "4",
publication date ="2020-10-12T00:00:00",
pages = "2419-2456",
itemtype = "ARTICLE",
issn = "0736-2935",
url = "https://ince.publisher.ingentaconnect.com/content/ince/incecp/2020/00000261/00000004/art00049",
author = "Feng, Feng",
abstract = "A two-dimensional spectral acoustic analogy (AA) theory is used to study the acoustic-source physics of a vortical flow. By way of the spectral AA theory and convolution filtering operations, the roles played by the wave packets of a pair of co-rotating vortices in the generation of
the sound are thoroughly discussed. It is found that the far-field sound is generated by the linear superimposition of the interactions between the base flow and the remaining wave packets. Moreover, a notable wave packet of the co-rotating vortices, called the acoustic-related wave packet
herein, is identified in the spectral domain, which not only contains all radiating components but also contributes to a discernible acoustic source. The capability of the spectral AA in identifying the physical sources will improve the understanding of the mechanisms of sound generated by
turbulent or unsteady vortical flows.",
}