Scattering of ultrasonic waves by void inclusions.

The Local Interaction Simulation Approach (LISA) has been applied to study the propagation of ultrasonic pulses in materials containing void inclusions. First the case of a single scatterer has been considered, with the conclusion that a void must be represented by at least four cells of the discretization lattice. Then the case of ultrasound propagation in a material with both a regular and random distribution of inclusions has been studied. Interesting interference effects have been obtained and it can be concluded that in both cases LISA allows reliable and efficient simulations to be performed.