Numerical Simulation Round Robin of a Coupled Volume Case as Compared to Scale Model Measurements
* Presenting author
The advantages and limitations of the principle numerical methods used in room acoustics have been primarily evaluated in single-volume room conditions, placing the emphasis on early reflections and the early part of the room acoustic impulse response. Few studies have examined the capabilities of numerical simulations to model correctly the case of coupled volumes, where the late part of the impulse response needs to be accurately represented. This work presents the preliminary results of a recent round robin type study comparing coupled volume theory and numerical simulation results with measurements carried out in a physical scale model. Numerical methods include geometrical acoustic solutions with several ray-tracing approaches and wave-based methods, including FDTD implementations. A scale model was used as a reference (corrected to 1:1 scale) as this physical method allows for observation of sound fields in coupled spaces, reproducing the acoustic energy transport through coupling surfaces between volumes. All room model coordinates were provided to participants. To avoid issues regarding variations in implementation of material definitions and scattering behaviors across different methods, the acoustics of the individual volumes was prescribed, through the reverberation time, in the uncoupled condition. The volumes were then coupled and the results analyzed.