Multiple Scattering by an Impenetrable Cluster: Energy Transfer Process of the Scattered Sound

A cluster of impenetrable scatterers is excited by a point source located inside a penetrable scatterer. The conservation of energy and the energy transfer process for this problem are considered. Relations of the scattering cross section with the complex sound intensity in the exciting scatterer are derived. A connection between the energy densities in the cluster's exterior and the reactive acoustic intensity through the exciting scatterer is established.