Propagation Of Pressure Waves In The Vicinity Of A Rigid InclusionSubmerged In A Channel Bounded By An Elastic Half-space

Abstract

The present paper computes the pressure field generated by spatially-sinusoidal harmonic pressure line sources in the vicinity of a rigid inclusion submerged in a fluid channel, bounded by an elastic half-space. The formulation of the problem is performed in the frequency domain. Time solutions are obtained by applying inverse Fourier transforms. The solution is computed using a 2-112-D Boundary Element Method (BEM) model. Only the surface of the rigid inclusion is discretized with boundary elements, since the Green's functions used take the presence of the free surface and of the fluidlelastic interface floor into account. Computer simulations are performed for a fluid waveguide with a submerged rigid inclusion. The time domain responses are presented and discussed, identifying features that can be used to detect the presence and location of inclusions submerged in a fluid channel. The responses are compared with those provided by a model that assumes the floor of the fluid channel to be rigid, in order to assess the influence of the mechanical properties of the fluid floor channel on the fluid pressure variation.