Vanhille C., Campos-Pozuelo C.

In the framework of the study of nonlinear acoustic resonators, the knowledge of the effect caused by the source, its position and distribution, on the acoustic pressure field generated inside the cavity is important. In particular, this knowledge should imply the possibility of controlling the pressure amplitude distribution. With this objective in mind, this work presents a numerical analysis of a three-dimensional resonator with axial symmetry. This cavity is fulfilled by air and its walls are rigid. Several numerical experiences are carried out. Various kinds of sources are used. They are characterized by the position of the piston on the wall and by the displacement distribution along the piston. Simulations are carried out in the time domain by using the finite-difference Snow-Ac code. This model is based on a set of partial derivatives equations written in Lagrangian coordinates. The acoustic pressure field is analysed in each configuration. The definition of maximum amplitude zones, as well as rms pressure pattern, is the objective of simulations.