Numerical simulation round robin of a coupled volume case: Preliminary results

Antoine Weber (1) , Brian F.G. Katz (1)

1 IJLRDA-LAM - Lutheries - Acoustique - Musique

The advantages and limitations of most numerical methods in room acoustics have to date been primarily evaluated in single-volume room conditions, placing emphasis on early reflection components and the early part of the room acoustic impulse response. Few studies have examined the capabilities of simulations to model correctly the case of coupled volumes, where the late part of the impulse response is not a simple extension of the early part and needs to be accurately represented. This work presents preliminary results of a round robin study comparing numerical simulation results with coupled volume theory, using physical scale model measurements to define general parameters. Numerical methods included geometrical acoustic solutions, with image source method and ray/cone/path-tracing type approaches, and wave-based methods, comprising several FDTD implementations. A scale model was used to set the parameters of a statistical model to ensure a physically realistic configuration. Room model coordinates were specified. To avoid issues regarding variations in implementation of material and scattering behaviors across methods, the reverberation time of separate individual volumes was prescribed in the uncoupled condition. Volumes were then coupled and the results analyzed. The comparison is of a rather simplified room acoustic model, assuming homogeneous boundary conditions.

Domaines: Sciences de l'ingénieur [physics]; Acoustique [physics.class-ph]

Antoine Weber, Brian F.G. Katz. Numerical simulation round robin of a coupled volume case: Preliminary results. ICA 2019, Sep 2019, Aachen, Germany. ⟨hal-02304623⟩