Author(s)

A. Pereira, A. Tadeu and J. António

Abstract

3D wave propagation in the presence of an infinite cylindrical solid submerged in a fluid medium A. Pereira, A. Tadeu & J. Antonio Department of Civil Engineering, University of Coimbra, 3030 Coimbra, Portugal Abstract The Boundary Element Method (BEM) is used to compute the three-dimensional pressure field generated by a point pressure source in the vicinity of an infinite cylindrical solid element submerged in an inviscid fluid medium. The problem is solved in the frequency domain and the responses in the time domain are obtained by applying an inverse Fast Fourier Transform using a Ricker pulse as a dynamic excitation source. This model is used to study the behaviour of the guided wave modes in the close vicinity of the cylindrical inclusion. The irregularity of the cylindrical inclusion cross-section is one variable analysed. Frequency vs axial-wave number responses and time domain responses are both calculated. Complex frequencies are used to avoid aliasing phenome

Keywords