Sound radiation from a water-filled pipe, radiation into light fluid

This paper is concerned with the sound radiation from a water-filled exhaust pipe. The pipe opening and a plate attached to it form a vibrating surface for this radiation. Fluid-structural coupling between the pipe and enclosed fluid is included in the system modeling, but light fluid assumption is used for sound radiation into the space above the vibrating surface. In this paper, a numerical study on the n=0 mode in the pipe shows that the wave types associated with this mode have different characteristics in two regions of the nondimensional frequency Omega. In the first region of 0