Scattering from a partially fluid-filled, elastic-shelled sphere

In this article a sphere is taken to be partially filled with fluid so that its interior is part fluid and part air. A set of basis of functions, base d upon an origin at the fluid/air interface, is used for the interior and a set of basis functions based upon the center of the sphere is used for the shell and exterior of the sphere. These sets of basis functions are couple d at the shell/interior interface and the resulting coupled system of equat ions solved to yield the scattered field. Numerical computations using this approach are presented for varying amounts of fluid-fill and for varying i ncident plane waves.