  In this paper, I develop a boundary element method for axisymmetric acoustic
radiation and propagation problems in a subsonic uniform flow. This formulation
uses the axisymmetric convected Green's function independent of the flow
direction arising from the adjunct operator by the Prandtl-Glauert
transformation and uses two new operators, one concerning the particular normal
derivative and the other concerning the convected normal derivative. These two
new operators reduce the terms used in the conventional integral formulas
developed in the literature, to facilitate the numerical and analytical method
applied to the infinite axisymmetric cylindrical duct in a subsonic uniform
flow.
