A numerical investigation of the sound intensity field in rooms by using diffusion theory and particle tracing
Résumé
This work focuses on the calculation of net intensity vectors in rooms, by using two different methods : a geometrical method, based on particle tracing, and the room-acoustic diffusion theory. The classical assumption for diffuse sound fields is that the net flow of reverberant energy at any location in Room, i.e., the reverberant intensity vector, is null. The reverberant field in rooms with homogeneous dimensions and uniform absorption coefficients is usually considered as diffuse. This study focuses first on the spatial structure of the intensity vector field in such rooms, showing that, although the energy density variation is weak, an organized structure of energy flows can be observed throughout the room. In a second part, the net intensity field in more complex rooms, such as, for example, long rooms, will be investigated in the same way, for both diffuse and specular reflections, with the aim of providing numerical estimations of the sound intensity field and of the room-acoustic diffusion coefficient.