“…10 Though the vortices are very drastic simplifications of real flow turbulence, this semianalytical analysis of vortex sound has attracted the attention of many researchers as it is expected to be able to provide insights into the much more complicated turbulence-solid surfaces aeroacoustics. Typical examples of such analysis include those of Cannell and Ffowcs Williams, 11 Obermeier and Zhu, 12 and more recently of Howe. 13 In addition, Crighton 14 and Obermeier 15 investigated the sound generation when the vortex interacts with an infinite half plane and a circular cylinder, respectively, by using the method of matched asymptotic expansions.…”