Wideband acoustic simulation of anechoic chambers using a finite-difference method with porous media modeling

Accurate simulation of the acoustic field within anechoic chambers could be used to optimize the design of new chambers and for enhancing experiments in existing ones. Such simulations are challenging, however, due to the need to model the extended reaction of the wedge-shaped absorption structures that line the chamber walls. This study performs anechoic chamber simulations using a recently developed finite-difference method, which extends the low-dispersion face-centered cubic scheme with modeling of the acoustic propagation in porous volumes. Examples demonstrate the feasibility of computing wideband impulse responses for medium-sized rooms using a single GPU processor. The results are compared with chamber qualification standards and measurements from an open-source data set. Numerical experiments explore the effects of varying certain parameters, such as the room dimensions or the geometry and material properties of the absorbers.