A database of scale model measurements for urban sound propagation in a moving atmosphere and first comparisons with simulations

The ability to predict environmental sound propagation is of paramount importance to the development and evaluation of noise mitigation strategies. In this context, the recourse to full-wave numerical methods is be- coming increasingly popular, even for long-range 3D configurations. Such methods consist in directly solving relevant governing equations of acoustics and do not generally require further modeling assumptions. They are therefore able to provide a very accurate description of wave phenomena, and can inherently account for micro-meteorology and/or complex boundaries (absorbing ground, obstacles or buildings). One limitation ac- tually pertains to the determination of the physical input parameters, which can in practice hinder the accuracy of simulations; controlled experimental data are thus crucial for validation purposes. The current work aims at presenting and sharing a series of scale model acoustics measurements in a wind tunnel (scale 1:40), with different downwind conditions representative of the atmospheric boundary layer and with different urban ar- rangements (solar panel fields and urban canyons). The maximum investigated range is 100 m for frequencies up to 2 kHz, at full scale. The measurements are compared against a discontinuous Galerkin solver, where the (time-averaged) input wind fields are estimated from computational fluid dynamics: a very good agreement is obtained with deterministic simulations.