Author(s)

L Godinho, F Branco & A Tadeu

Abstract

This work focuses on the analysis of wave propagation inside and around a ring-shaped structure submerged in a fluid medium, subjected to the effect of a point pressure load placed inside the fluid. The structures modeled in this work are assumed to have a constant cross-section along their axis, a situation usually designated as 2-1/2-D. The 3 D solution is obtained by means of a Fourier Transform in the direction in which the geometry does not vary, requiring the solution of a series of 2D problems with different spatial wave numbers. Each 2D solution is obtained via the Boundary Element Method, assuming the ring structure to be made of a homogeneous elastic material surrounded by a homogeneous fluid. The full interaction between the solid ring and the fluids inside and outside the structure is taken into account. The different normal modes excited are analyzed for different scenarios, including the cases of ring structures defined by two concentric or non-concentric cylindrical circular surfaces. The ring structure is assumed to be filled with a fluid whose properties may differ from the surrounding medium.

Keywords