  The development of acoustic simulation workflows in the time-domain
description is essential for predicting the sound of aeroacoustic or other
transient acoustic effects. A common practice for noise mitigation is using
absorbers. The modeling of these acoustic absorbers is typically provided in
the frequency domain. Several, methods established bridging this gap,
investigating methods to model absorber in the time domain. Therefore, this
short article, describes the analytic solution in time-domain for benchmarking
absorber simulations with infinite 1D, 2D, and 3D domains. Connected to the
analytic solution, a Matlab script is provided to easily obtain the reference
solution. The reference codes are provided as benchmark solution in the EAA
TCCA Benchmarking database as METAMAT 01.
