Two-dimensional frequency domain scattering and point excitation of partially filled elastic cylinders

A suite of problems involving solid–fluid interactions with a two-dimensional cylindrical structure, i.e. with non-oblique forcing or wave incidence, is considered. Assessments are made of how the amount of filling in the interior effects the external response of the cylinder both qualitatively and quantitatively, with a view to developing long-range non-destructive testing techniques for submerged part-filled objects. Resonance frequencies are found and their usefulness, or otherwise, in characterising the extent of inner filling fraction. Numerical algorithms are generated to grid the domain and are complemented by a discussion of the use of perfectly matched layers to model the infinite background fluid; it is demonstrated that it is preferable not to directly attach the layer directly to the cylinder.