Single versus multi-domain analysis in diffusion equation modeling for sound field analysis of distinct room shapes
* Presenting author
Diffusion equation modelling has gained popularity recently in the application of room acoustics analysis mostly due to its computational efficiency. The method has been used in proportionate rooms confidently, while some research has highlighted its applicability in disproportionate rooms as well. In this study specifically, coupled rooms and long enclosures that cannot be very well defined by statistical theory, or under-estimated by ray tracing are studied by DEM analysis. The diffusion coefficient, dependent upon the volume and surface absorption area of individual domains, is one major indicator in this analysis. Defining domains in coupled volumes or in coupled long rooms is an important issue. The limits where the domains can be considered as a single space or as a multi-domain system are quite vague and necessitate a systematic investigation. Some real structures including multi-volume monuments and two tracked subway stations are examined in that respect, by applying DEM in a finite element medium. The results of this investigation are assistive in regards to the coupling factor limits when different volumetric and aperture size relations are established. The pre-knowledge of applying either a single domain or a multi-domain solution in a specific combination of volumes will augment the speed of analysis.